Patent Publication Number: US-2023164906-A1

Title: Radio-frequency module and communication device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This is a continuation of International Application No. PCT/JP2021/028578 filed on Aug. 2, 2021 which claims priority from Japanese Patent Application No. 2020-136490 filed on Aug. 12, 2020. The contents of these applications are incorporated herein by reference in their entireties. 
    
    
     BACKGROUND OF THE DISCLOSURE 
     Field of the Disclosure 
     The present disclosure generally relates to a radio-frequency module and a communication device and, more specifically, to a radio-frequency module that includes a transmission filter, and a communication device that includes the radio-frequency module. 
     Description of the Related Art 
     Patent Document 1 describes a radio-frequency module. The radio-frequency module includes a mounting substrate having a first major surface and a second major surface opposite to each other, a transmission filter mounted on the first major surface of the mounting substrate, a resin member (resin layer) covering the transmission filter, and a shield electrode layer (shield layer). 
     In the radio-frequency module described in Patent Document 1, the shield electrode layer is formed so as to cover the top surface and side surfaces of the resin member. 
     Patent Document 1 also describes a communication device including a radio-frequency module. 
     Patent Document 1: International Publication No. 2019/181590 
     BRIEF SUMMARY OF THE DISCLOSURE 
     In a radio-frequency module, improvement in heat dissipation capability is desired to suppress an increase in the temperature of the transmission filter. 
     It is a possible benefit of the present disclosure to provide a radio-frequency module and a communication device capable of improving the heat dissipation capability. 
     A radio-frequency module according to an aspect of the present disclosure includes a mounting substrate, a first transmission filter, a second transmission filter, a resin layer, and a shield layer. The mounting substrate has a first major surface and a second major surface opposite to each other. The first transmission filter is mounted on the first major surface of the mounting substrate. The second transmission filter is mounted on the first major surface of the mounting substrate and higher in power class than the first transmission filter. The resin layer is disposed on the first major surface of the mounting substrate. The shield layer covers at least part of the resin layer. The resin layer covers at least part of an outer peripheral surface of the first transmission filter and covers at least part of an outer peripheral surface of the second transmission filter. The shield layer overlaps at least part of the second transmission filter in plan view in a thickness direction of the mounting substrate. At least part of a major surface of the second transmission filter on an opposite side to the mounting substrate side is in contact with the shield layer. 
     A radio-frequency module according to an aspect of the present disclosure includes a mounting substrate, a first transmission filter, a second transmission filter, a metal member, a resin layer, and a shield layer. The mounting substrate has a first major surface and a second major surface opposite to each other. The first transmission filter is mounted on the first major surface of the mounting substrate. The second transmission filter is mounted on the first major surface of the mounting substrate and higher in power class than the first transmission filter. The metal member is disposed on a major surface of the second transmission filter on an opposite side to the mounting substrate side. The resin layer is disposed on the first major surface of the mounting substrate. The shield layer covers at least part of the resin layer. The resin layer covers at least part of an outer peripheral surface of the first transmission filter, covers at least part of an outer peripheral surface of the second transmission filter, and covers at least part of an outer peripheral surface of the metal member. The shield layer overlaps at least part of the metal member in plan view in a thickness direction of the mounting substrate. At least part of a major surface of the metal member on an opposite side to the mounting substrate side is in contact with the shield layer. 
     A radio-frequency module according to an aspect of the present disclosure includes a mounting substrate, a transmission filter, a resin layer, and a shield layer. The mounting substrate has a first major surface and a second major surface opposite to each other. The transmission filter is at least one transmission filter of a power class 1 transmission filter and a power class 2 transmission filter, mounted on the first major surface of the mounting substrate. The resin layer is disposed on the first major surface of the mounting substrate. The shield layer covers at least part of the resin layer. The resin layer covers at least part of an outer peripheral surface of the at least one transmission filter. The shield layer overlaps at least part of the at least one transmission filter in plan view in a thickness direction of the mounting substrate. At least part of a major surface of the at least one transmission filter on an opposite side to the mounting substrate side is in contact with the shield layer. 
     A radio-frequency module according to an aspect of the present disclosure includes a mounting substrate, a transmission filter, a metal member, a resin layer, and a shield layer. The mounting substrate has a first major surface and a second major surface opposite to each other. The transmission filter is at least one transmission filter of a power class 1 transmission filter and a power class 2 transmission filter, mounted on the first major surface of the mounting substrate. The metal member is disposed on a major surface of the at least one transmission filter on an opposite side to the mounting substrate side. The resin layer is disposed on the first major surface of the mounting substrate. The shield layer covers at least part of the resin layer. The resin layer covers at least part of an outer peripheral surface of the at least one transmission filter and covers at least part of an outer peripheral surface of the metal member. The shield layer overlaps at least part of the metal member in plan view in a thickness direction of the mounting substrate. At least part of a major surface of the metal member on an opposite side to the mounting substrate side is in contact with the shield layer. 
     A communication device according to an aspect of the present disclosure includes the radio-frequency module and a signal processing circuit. The signal processing circuit is connected to the radio-frequency module. 
     The radio-frequency module and the communication device according to the aspects of the present disclosure are capable of improving the heat dissipation capability. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG.  1    is a plan view that relates to a radio-frequency module according to a first embodiment and from which a shield layer and a resin layer are omitted. 
         FIG.  2    is a plan view that relates to the radio-frequency module and that shows a second major surface of a mounting substrate and circuit components and a plurality of external connection terminals disposed on a second major surface of the mounting substrate when seen through from the first major surface side of the mounting substrate. 
         FIG.  3    is a cross-sectional view of the radio-frequency module, taken along the line X-X in  FIG.  1   . 
         FIG.  4    is a cross-sectional view of the radio-frequency module, taken along the line Y-Y in  FIG.  1   . 
         FIG.  5    is a circuit configuration diagram of a communication device that includes the radio-frequency module. 
         FIG.  6    is a circuit diagram of a power amplifier and part of an output matching circuit of the radio-frequency module. 
         FIG.  7    is a cross-sectional view of a radio-frequency module according to a first modification of the first embodiment. 
         FIG.  8    is a cross-sectional view of a radio-frequency module according to a second modification of the first embodiment. 
         FIG.  9    is a cross-sectional view of a radio-frequency module according to a third modification of the first embodiment. 
         FIG.  10    is a cross-sectional view of a radio-frequency module according to a second embodiment. 
         FIG.  11    is a cross-sectional view of a radio-frequency module according to a first modification of the second embodiment. 
         FIG.  12    is a cross-sectional view of a radio-frequency module according to a second modification of the second embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
       FIGS.  1  to  4 , and  7  to  12    that will be referenced in the following embodiments and the like all are schematic diagrams, and the ratios of the sizes and thicknesses of component elements in the drawings do not always reflect actual scale ratios. 
     First Embodiment 
     As shown in  FIGS.  1  to  4   , a radio-frequency module  100  according to the first embodiment includes a mounting substrate  130 , first transmission filters  11 ,  12 , second transmission filters  13 ,  14 , a resin layer  15 , and a shield layer  16 . The mounting substrate  130  has a first major surface  131  and a second major surface  132  opposite to each other. The first transmission filters  11 ,  12  are mounted on the first major surface  131  of the mounting substrate  130 . The second transmission filters  13 ,  14  are mounted on the first major surface  131  of the mounting substrate  130  and are higher in power class than the first transmission filters  11 ,  12 . The first transmission filters  11 ,  12  are, for example, power class 3 transmission filters. The second transmission filters  13 ,  14  are, for example, power class 2 transmission filters. The resin layer  15  is disposed on the first major surface  131  of the mounting substrate  130 . The resin layer  15  covers at least part of an outer peripheral surface  103  of each of the first transmission filters  11 ,  12  and covers at least part of an outer peripheral surface  103  of each of the second transmission filters  13 ,  14 . In the first embodiment, the resin layer  15  covers the entire outer peripheral surface  103  of each of the first transmission filters  11 ,  12  and covers the entire outer peripheral surface  103  of each of the second transmission filters  13 ,  14 . The shield layer  16  covers at least part of the resin layer  15 . The shield layer  16  overlaps at least part of each of the second transmission filters  13 ,  14  in plan view in a thickness direction D 1  of the mounting substrate  130 . In the first embodiment, the shield layer  16  overlaps the entire part of each of the second transmission filters  13 ,  14  in plan view in the thickness direction D 1  of the mounting substrate  130 . At least part of a major surface  102  of each of the second transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . In other words, at least part of an area covered with the shield layer  16  on the major surface  102  of each of the second transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . In the first embodiment, the entire part of the major surface  102  of each of the second transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . Thus, the radio-frequency module  100  according to the first embodiment is capable of improving the heat dissipation capability. 
     Here, the term “power class” means a power class defined in 3GPP. A transmission filter has a higher power class as the transmission filter has a greater maximum transmission power. Specifically, power class decreases in order of power class 1 transmission filter, power class 2 transmission filter, and power class 3 transmission filter. The maximum transmission power of the power class 1 transmission filter is 29 dBm. The maximum transmission power of the power class 2 transmission filter is 26 dBm. The maximum transmission power of the power class 3 transmission filter is 23 dBm. In 5G NR as well, as in the case of 3GPP, power classes are defined. 
     Hereinafter, the radio-frequency module  100  and a communication device  300  according to the first embodiment will be described with reference to  FIGS.  1  to  9   . 
     (1) Radio-Frequency Module and Communication Device 
     (1.1) Circuit Configuration of Radio-Frequency Module and Communication Device 
     Initially, the circuit configuration of the radio-frequency module  100  and the communication device  300  according to the first embodiment will be described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100  according to the first embodiment is used in, for example, the communication device  300  that supports multiband/multimode functionality. The communication device  300  is, for example, a mobile phone (for example, a smartphone); however, the configuration is not limited thereto. The communication device  300  may be, for example, a wearable terminal (for example, a smart watch). The radio-frequency module  100  is, for example, a module that supports a fourth generation mobile communication (4G) standard and a fifth generation mobile communication (5G) standard. The 4G standard is, for example, a 3GPP long term evolution (LTE) standard. The 5G standard is, for example, a 5G new radio (NR). The radio-frequency module  100  is a module that supports, for example, carrier aggregation and dual connectivity. Here, carrier aggregation and dual connectivity mean a communication that uses radio waves in multiple frequency bands at the same time. 
     The radio-frequency module  100  is, for example, configured to be capable of amplifying a transmission signal (radio-frequency signal) in a first frequency band (for example, 1710 MHz to 1980 MHz) inputted from the signal processing circuit  301  and outputting the transmission signal to an antenna A 1  (hereinafter, also referred to as first antenna A 1 ). The radio-frequency module  100  is, for example, configured to be capable of amplifying a transmission signal (radio-frequency signal) in a second frequency band (for example, 2300 MHz to 2690 MHz) inputted from the signal processing circuit  301  and outputting the transmission signal to an antenna A 2  (hereinafter, also referred to as second antenna A 2 ). The radio-frequency module  100  is configured to be capable of amplifying a reception signal (radio-frequency signal) in the first frequency band inputted from the first antenna A 1  and outputting the reception signal to the signal processing circuit  301 . The radio-frequency module  100  is configured to be capable of amplifying a reception signal (radio-frequency signal) in the second frequency band inputted from the second antenna A 2  and outputting the reception signal to the signal processing circuit  301 . The radio-frequency module  100  is configured to be capable of amplifying a reception signal (radio-frequency signal) in a third frequency band (for example, 1880 MHz to 2025 MHz) inputted from an antenna A 3  (hereinafter, also referred to as third antenna A 3 ) and outputting the reception signal to the signal processing circuit  301 . 
     The signal processing circuit  301  is not a component element of the radio-frequency module  100  but a component element of the communication device  300  that includes the radio-frequency module  100 . The radio-frequency module  100  is, for example, controlled by the signal processing circuit  301  of the communication device  300 . The communication device  300  includes the radio-frequency module  100  and the signal processing circuit  301 . The communication device  300  further includes the first antenna A 1 , the second antenna A 2 , and the third antenna A 3 . The communication device  300  further includes a circuit board on or in which the radio-frequency module  100  is mounted. The circuit board is, for example, a printed circuit board. The circuit board has a ground electrode to which a ground potential is applied. 
     The signal processing circuit  301  includes, for example, an RF signal processing circuit  302  and a baseband signal processing circuit  303 . The RF signal processing circuit  302  is, for example, a radio frequency integrated circuit (RFIC), and performs signal processing on a radio-frequency signal. The RF signal processing circuit  302 , for example, performs signal processing on a radio-frequency signal (transmission signal) outputted from the baseband signal processing circuit  303  by up conversion or the like and outputs the processed radio-frequency signal to the radio-frequency module  100 . The RF signal processing circuit  302 , for example, performs signal processing on a radio-frequency signal (reception signal) outputted from the radio-frequency module  100  by down conversion or the like and outputs the processed radio-frequency signal to the baseband signal processing circuit  303 . 
     The baseband signal processing circuit  303  is, for example, a baseband integrated circuit (BBIC). The baseband signal processing circuit  303  generates an I-phase signal and a Q-phase signal from a baseband signal. The baseband signal is, for example, an audio signal, an image signal, or the like inputted from the outside. The baseband signal processing circuit  303  performs IQ modulation process by synthesizing the I-phase signal with the Q-phase signal and outputs a transmission signal. At this time, the transmission signal is generated as a modulation signal (IQ signal) obtained by modulating the amplitude of a carrier wave signal with a predetermined frequency at a period longer than the period of the carrier wave signal. A reception signal processed by the baseband signal processing circuit  303  is, for example, used to display an image as an image signal or to talk as a voice signal. The radio-frequency module  100  transmits a radio-frequency signal (a reception signal or a transmission signal) between each of the first antenna A 1 , the second antenna A 2 , and the third antenna A 3  and the RF signal processing circuit  302  of the signal processing circuit  301 . 
     The radio-frequency module  100  includes a plurality of (four in the illustrated example) transmission filters  1 . The radio-frequency module  100  includes a power amplifier  3  and an output matching circuit  4 . The radio-frequency module  100  includes a plurality of (six in the illustrated example) receiving filters  2 . The radio-frequency module  100  includes a low-noise amplifier  18  and a plurality of (six in the illustrated example) input matching circuits  17 . The radio-frequency module  100  includes a first switch  5  and a second switch  7 . The radio-frequency module  100  further includes a controller  19 . The radio-frequency module  100  includes a plurality of (four in the illustrated example) matching circuits  6  connected between the second switch  7  and the plurality of transmission filters  1 . The radio-frequency module  100  includes a plurality of (three in the illustrated example) matching circuits  8  connected between the second switch  7  and a plurality of (three in the illustrated example) antenna terminals  91 A,  91 B,  91 C. 
     The transmission filters  1  respectively have pass bands different from one another. Hereinafter, when the four transmission filters  1  are described separately, the four transmission filters  1  may also be respectively referred to as a transmission filter  11 , a transmission filter  12 , a transmission filter  13 , and a transmission filter  14 . The receiving filters  2  respectively have pass bands different from one another. Hereinafter, when the six receiving filters  2  are described separately, the six receiving filters  2  may also be respectively referred to as a receiving filter  21 , a receiving filter  22 , a receiving filter  23 , a receiving filter  24 , a receiving filter  25 , and a receiving filter  26 . 
     The radio-frequency module  100  includes a plurality of external connection terminals  9 . The plurality of external connection terminals  9  includes the plurality of (three in the illustrated example) antenna terminals  91 A,  91 B,  91 C, a signal input terminal  92 , a signal output terminal  93 , a control terminal  94 , and a plurality of ground terminals  95  (see  FIGS.  2  to  4   ). The plurality of ground terminals  95  is terminals electrically connected to the ground electrode of the circuit board of the communication device  300  and applied with a ground potential. 
     The transmission filter  11  is, for example, a filter that has a transmission band of a first communication band as a pass band. The transmission filter  12  is, for example, a filter that has a transmission band of a second communication band as a pass band. The transmission filter  13  is, for example, a filter that has a transmission band of a third communication band as a pass band. The transmission filter  14  is, for example, a filter that has a transmission band of a fourth communication band as a pass band. The first communication band is associated with a transmission signal that passes through the transmission filter  11  and is, for example, 5G NR standard n3. The second communication band is associated with a transmission signal that passes through the transmission filter  12  and is, for example, 5G NR standard n1. The third communication band is associated with a transmission signal that passes through the transmission filter  13  and is, for example, 5G NR standard n40. The fourth communication band is associated with a transmission signal that passes through the transmission filter  14  and is, for example, 5G NR standard n41. In the radio-frequency module  100  according to the first embodiment, the transmission filters  11 ,  12  are power class 3 transmission filters, and the transmission filters  13 ,  14  are power class 2 transmission filters. In other words, the transmission filters  11 ,  12  are first transmission filters with a relatively low power class, and the transmission filters  13 ,  14  are second transmission filters with a relatively high power class. 
     The power amplifier  3  has an input terminal and an output terminal. The power amplifier  3  amplifies transmission signals in the first frequency band and the second frequency band, inputted to the input terminal, and outputs the transmission signals from the output terminal. Here, the first frequency band includes, for example, the first communication band and the second communication band. The second frequency band includes, for example, the third communication band and the fourth communication band. The input terminal of the power amplifier  3  is connected to the signal input terminal  92 . The input terminal of the power amplifier  3  is connected to the signal processing circuit  301  via the signal input terminal  92 . The signal input terminal  92  is a terminal for inputting a radio-frequency signal (transmission signal) from an external circuit (for example, the signal processing circuit  301 ) to the radio-frequency module  100 . The output terminal of the power amplifier  3  is connected to a common terminal  50  of a first switch  5  via the output matching circuit  4 . 
     For example, as shown in  FIG.  6   , the power amplifier  3  includes a driver stage amplifier  31 , two final stage amplifiers  32 A,  32 B, and an unbalance-balance conversion circuit  33  (hereinafter, referred to as first balun  33 ) including a first transformer T 1 . Each of the driver stage amplifier  31 , the final stage amplifier  32 A, and the final stage amplifier  32 B includes an amplifier transistor. The first transformer T 1  includes a primary inductor L 10  and a secondary inductor L 11 . The primary inductor L 10  is connected between an unbalanced terminal  331  and a ground. The first balun  33  has the unbalanced terminal  331  and a pair of balanced terminals  332 A,  332 B. In the power amplifier  3 , the input terminal of the driver stage amplifier  31  is connected to the signal input terminal  92 , and the output terminal of the driver stage amplifier  31  is connected to the unbalanced terminal  331 . In the power amplifier  3 , the input terminal of the final stage amplifier  32 A is connected to the balanced terminal  332 A, and the input terminal of the final stage amplifier  32 B is connected to the balanced terminal  332 B. In the power amplifier  3 , the input terminal of the driver stage amplifier  31  is an input terminal of the power amplifier  3 , and the output terminal of each of the two final stage amplifiers  32 A,  32 B is an output terminal of the power amplifier  3 . The power amplifier  3  makes up a differential amplifier circuit. A voltage Vcc 1  is applied to the output terminal of the driver stage amplifier  31 . 
     The output matching circuit  4  is provided in a signal path between the output terminal of the power amplifier  3  and the common terminal  50  of the first switch  5 . The output matching circuit  4  is a circuit for matching the impedance between the power amplifier  3  and the plurality of transmission filters  1 . The output matching circuit  4  includes, for example, a balance-unbalance conversion circuit  41  (hereinafter referred to as second balun  41 ) having a second transformer T 2 , and a plurality of circuit elements  42  (see  FIG.  1   ). The second balun  41  has a pair of balanced terminals  411 A,  411 B and an unbalanced terminal  412 . In the output matching circuit  4 , the balanced terminal  411 A is connected to the output terminal of the final stage amplifier  32 A, the balanced terminal  411 B is connected to the output terminal of the final stage amplifier  32 B, and the unbalanced terminal  412  is connected to the common terminal  50  of the first switch  5 . The second transformer T 2  has, for example, four inductor elements L 1 , L 2 , L 3 , L 4 . In the second transformer T 2 , a primary inductor is made up of a series circuit of the inductor element L 3  and the inductor element L 4 , and a secondary inductor is made up of a series circuit of the inductor element L 1  and the inductor element L 2 . In the second transformer T 2 , the primary inductor is connected between the balanced terminal  411 A and the balanced terminal  411 B. 
     The radio-frequency module  100  further includes a series circuit connected between a wire W 1  connecting the output terminal of the final stage amplifier  32 A with the balanced terminal  411 A and a wire W 2  connecting the output terminal of the final stage amplifier  32 B with the balanced terminal  411 B. This series circuit includes an inductor Lc 1 , a capacitor C 1 , and an inductor Lc 2  and is not grounded to a ground. This series circuit is an LC resonant circuit for attenuating an odd-ordered harmonic (for example, a third-order harmonic) of a radio-frequency signal (transmission signal) inputted to the power amplifier  3 . The resonant frequency of the LC resonant circuit is included in a frequency band between a frequency three times the lower limit of a relatively low frequency-side frequency band of the first frequency band and the second frequency band and a frequency three times the upper limit of a relatively high frequency-side frequency band of the first frequency band and the second frequency band. The radio-frequency module  100  further includes an inductor La 1  connected between the output terminal of the final stage amplifier  32 A and the balanced terminal  411 A, and an inductor La 2  connected between the output terminal of the final stage amplifier  32 B and the balanced terminal  411 B. 
     The receiving filter  21  is, for example, a filter that has a receiving band of the first communication band as a pass band. The receiving filter  22  is, for example, a filter that has a receiving band of the second communication band as a pass band. The receiving filter  23  is, for example, a filter that has a receiving band of the third communication band as a pass band. The receiving filter  24  is, for example, a filter that has a receiving band of the fourth communication band as a pass band. The receiving filter  25  is, for example, a filter that has a receiving band of the fifth communication band as a pass band. The receiving filter  26  is, for example, a filter that has a receiving band of the sixth communication band as a pass band. The first communication band is associated with a reception signal that passes through the receiving filter  21  and is, for example, 5G NR standard n3. The second communication band is associated with a reception signal that passes through the receiving filter  22  and is, for example, 5G NR standard n1. The third communication band is associated with a reception signal that passes through the receiving filter  23  and is, for example, 5G NR standard n40. The fourth communication band is associated with a reception signal that passes through the receiving filter  24  and is, for example, 5G NR standard n41. The fifth communication band is associated with a reception signal that passes through the receiving filter  25  and is, for example, 3GPP LTE standard Band 34. The sixth communication band is associated with a reception signal that passes through the receiving filter  26  and is, for example, 3GPP LTE standard Band 39. 
     The low-noise amplifier  18  amplifies input reception signals in the first frequency band, the second frequency band, and the third frequency band and outputs the reception signals. The first frequency band includes, for example, the first communication band and the second communication band. The second frequency band includes, for example, the third communication band and the fourth communication band. The third frequency band includes, for example, the fifth communication band and the sixth communication band. 
     The low-noise amplifier  18  includes a plurality of (for example, six) amplifier transistors. Each of the plurality of amplifier transistors has an input terminal and an output terminal. The low-noise amplifier  18  amplifies a reception signal inputted to the input terminal of any one of the plurality of amplifier transistors and outputs the reception signal from the output terminal. The input terminal of each of the plurality of amplifier transistors of the low-noise amplifier  18  is connected to a corresponding one of the plurality of receiving filters  2  via a corresponding one of the plurality of input matching circuits  17 . The output terminal of the low-noise amplifier  18  is connected to the signal output terminal  93 . The output terminal of the low-noise amplifier  18  is, for example, connected to the signal processing circuit  301  via the signal output terminal  93 . The signal output terminal  93  is a terminal for outputting a radio-frequency signal (reception signal) from the low-noise amplifier  18  to an external circuit (for example, the signal processing circuit  301 ). 
     The plurality of (for example, six) input matching circuits  17  is provided in a plurality of signal paths between the input terminals of the plurality of amplifier transistors of the low-noise amplifier  18  and the plurality of receiving filters  2 . Hereinafter, when the six input matching circuits  17  are described separately, the six input matching circuits  17  may also be respectively referred to as an input matching circuit  171 , an input matching circuit  172 , an input matching circuit  173 , an input matching circuit  174 , an input matching circuit  175 , and an input matching circuit  176 . 
     The input matching circuit  171  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  21 . The input matching circuit  172  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  22 . The input matching circuit  173  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  23 . The input matching circuit  174  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  24 . The input matching circuit  175  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  25 . The input matching circuit  176  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  26 . Each of the plurality of input matching circuits  17  is made up of, for example, one inductor; however, the configuration is not limited thereto. Each of the plurality of input matching circuits  17  may include, for example, a plurality of inductors and a plurality of capacitors. 
     The plurality of (for example, six) input matching circuits  17  is provided in a plurality of signal paths between the input terminals of the plurality of amplifier transistors of the low-noise amplifier  18  and the plurality of receiving filters  2 . Hereinafter, when the six input matching circuits  17  are described separately, the six input matching circuits  17  may also be respectively referred to as an input matching circuit  171 , an input matching circuit  172 , an input matching circuit  173 , an input matching circuit  174 , an input matching circuit  175 , and an input matching circuit  176 . 
     The input matching circuit  171  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  21 . The input matching circuit  172  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  22 . The input matching circuit  173  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  23 . The input matching circuit  174  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  24 . The input matching circuit  175  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  25 . The input matching circuit  176  is a circuit for matching the impedance between the low-noise amplifier  18  and the receiving filter  26 . Each of the plurality of input matching circuits  17  is made up of, for example, one inductor; however, the configuration is not limited thereto. Each of the plurality of input matching circuits  17  may include, for example, a plurality of inductors and a plurality of capacitors. 
     The first switch  5  has the common terminal  50  and a plurality of (four in the illustrated example) selection terminals  51 . Hereinafter, when the four selection terminals  51  are described separately, the four selection terminals  51  may also be respectively referred to as a selection terminal  511 , a selection terminal  512 , a selection terminal  513 , and a selection terminal  514 . 
     The common terminal  50  is connected to the output terminal of the power amplifier  3  via the output matching circuit  4 . The selection terminal  511  is connected to the input terminal of the transmission filter  11 . The selection terminal  512  is connected to the input terminal of the transmission filter  12 . The selection terminal  513  is connected to the input terminal of the transmission filter  13 . The selection terminal  514  is connected to the input terminal of the transmission filter  14 . The first switch  5  is, for example, a switch allowed to connect at least one of the plurality of selection terminals  51  to the common terminal  50 . Here, the first switch  5  is, for example, a switch capable of one-to-one connection and one-to-multiple connection. 
     The first switch  5  is, for example, a switch integrated circuit (IC). The first switch  5  is controlled by, for example, the signal processing circuit  301 . The first switch  5  switches the connection status between the common terminal  50  and the plurality of selection terminals  51  in accordance with a control signal from the RF signal processing circuit  302  of the signal processing circuit  301 . The first switch  5  may be controlled by the controller  19  instead of being controlled by the signal processing circuit  301 . 
     The second switch  7  has a plurality of (three in the illustrated example) common terminals  70  and a plurality of (six in the illustrated example) selection terminals  71 . Hereinafter, when the three common terminals  70  are described separately, the three common terminals  70  may also be respectively referred to as a common terminal  70 A, a common terminal  70 B, and a common terminal  70 C. 
     Hereinafter, when the six selection terminals  71  are described separately, the six selection terminals  71  may also be respectively referred to as a selection terminal  711 , a selection terminal  712 , a selection terminal  713 , a selection terminal  714 , a selection terminal  715 , and a selection terminal  716 . 
     The common terminal  70 A is connected to the antenna terminal  91 A. The first antenna A 1  is connected to the antenna terminal  91 A. The common terminal  70 B is connected to the antenna terminal  91 B. The second antenna A 2  is connected to the antenna terminal  91 B. The common terminal  70 C is connected to the antenna terminal  91 C. The third antenna A 3  is connected to the antenna terminal  91 C. The selection terminal  711  is connected to a junction point between the output terminal of the transmission filter  11  and the input terminal of the receiving filter  21 . The selection terminal  712  is connected to a junction point between the output terminal of the transmission filter  12  and the input terminal of the receiving filter  22 . The selection terminal  713  is connected to a junction point between the output terminal of the transmission filter  13  and the input terminal of the receiving filter  23 . The selection terminal  714  is connected to a junction point between the output terminal of the transmission filter  14  and the input terminal of the receiving filter  24 . The selection terminal  715  is connected to the input terminal of the receiving filter  25 . The selection terminal  716  is connected to the input terminal of the receiving filter  26 . The second switch  7  is, for example, allowed to connect at least one of the plurality of selection terminals  711 ,  712  to the common terminal  70 A. The second switch  7  is, for example, allowed to connect at least one of the plurality of selection terminals  713 ,  714  to the common terminal  70 B. The second switch  7  is, for example, allowed to connect at least one of the plurality of selection terminals  715 ,  716  to the common terminal  70 C. Here, the second switch  7  is, for example, a switch capable of one-to-one connection and one-to-multiple connection. 
     The second switch  7  is, for example, a switch IC. The second switch  7  is controlled by, for example, the signal processing circuit  301 . The second switch  7  switches the connection status between the plurality of common terminals  70  and the plurality of selection terminals  71  in accordance with a control signal from the RF signal processing circuit  302  of the signal processing circuit  301 . The second switch  7  may be controlled by the controller  19  instead of being controlled by the signal processing circuit  301 . 
     Hereinafter, when the four matching circuits  6  are described separately, the four matching circuits  6  may also be respectively referred to as a matching circuit  61 , a matching circuit  62 , a matching circuit  63 , and a matching circuit  64 . 
     The matching circuit  61  is connected between the selection terminal  711  of the second switch  7  and the junction point between the output terminal of the transmission filter  11  and the input terminal of the receiving filter  21 . The matching circuit  62  is connected between the selection terminal  712  of the second switch  7  and the junction point between the output terminal of the transmission filter  12  and the input terminal of the receiving filter  22 . The matching circuit  63  is connected between the selection terminal  713  of the second switch  7  and the junction point between the output terminal of the transmission filter  13  and the input terminal of the receiving filter  23 . The matching circuit  64  is connected between the selection terminal  714  of the second switch  7  and the junction point between the output terminal of the transmission filter  14  and the input terminal of the receiving filter  24 . Each of the plurality of matching circuits  6  is made up of, for example, one inductor; however, the configuration is not limited thereto. Each of the plurality of matching circuits  6  may include, for example, a plurality of inductors and a plurality of capacitors. 
     Hereinafter, when the three matching circuits  8  are described separately, the three matching circuits  8  may also be respectively referred to as a matching circuit  81 , a matching circuit  82 , and a matching circuit  83 . 
     The matching circuit  81  is connected between the antenna terminal  91 A and the common terminal  70 A of the second switch  7 . The matching circuit  82  is connected between the antenna terminal  91 B and the common terminal  70 B of the second switch  7 . The matching circuit  83  is connected between the antenna terminal  91 C and the common terminal  70 C of the second switch  7 . Each of the plurality of matching circuits  8  is made up of, for example, one inductor; however, the configuration is not limited thereto. Each of the plurality of matching circuits  8  may include, for example, a plurality of inductors and a plurality of capacitors. 
     The controller  19  is connected to the control terminal  94 . The control terminal  94  is connected to, for example, the signal processing circuit  301 . The controller  19  controls the power amplifier  3  in accordance with a control signal from the signal processing circuit  301 . 
     (1.2) Structure of Radio-Frequency Module 
     Next, the structure of the radio-frequency module  100  according to the first embodiment will be described with reference to  FIGS.  1  to  4   . 
     As shown in  FIGS.  1  to  4   , the radio-frequency module  100  includes the mounting substrate  130  and the four transmission filters  1 . The radio-frequency module  100  includes the power amplifier  3  and the output matching circuit  4 . The radio-frequency module  100  includes the six receiving filters  2 , the low-noise amplifier  18 , the six input matching circuits  17 , the first switch  5 , the second switch  7 , and the controller  19 . The radio-frequency module  100  includes the four matching circuits  6  (hereinafter, also referred to as first matching circuits  6 ) and the three matching circuits  8  (hereinafter, also referred to as second matching circuits  8 ). The radio-frequency module  100  includes the plurality of external connection terminals  9 . The radio-frequency module  100  further includes the first resin layer (resin layer)  15 , a second resin layer  20 , and the shield layer  16 . 
     The mounting substrate  130  has the first major surface  131  and the second major surface  132  opposite to each other in the thickness direction D 1  of the mounting substrate  130 . The mounting substrate  130  is, for example, a multilayer substrate that includes a plurality of dielectric layers and a plurality of electrically conductive layers. The plurality of dielectric layers and the plurality of electrically conductive layers are laminated in the thickness direction D 1  of the mounting substrate  130 . The plurality of electrically conductive layers each is formed in a predetermined pattern determined layer by layer. Each of the plurality of electrically conductive layers includes one or more conductor portions in a plane orthogonal to the thickness direction D 1  of the mounting substrate  130 . The material of each electrically conductive layer is, for example, copper. The plurality of electrically conductive layers includes a ground layer. In the radio-frequency module  100 , the plurality of ground terminals  95  (see  FIGS.  3  and  4   ) and the ground layer are electrically connected via a via conductor or the like of the mounting substrate  130 . The mounting substrate  130  is, for example, a low temperature co-fired ceramics (LTCC) substrate. The mounting substrate  130  is not limited to an LTCC substrate. The mounting substrate  130  may be, for example, a printed circuit board, a high temperature co-fired ceramics (HTCC) substrate, or a resin multilayer substrate. 
     The mounting substrate  130  is not limited to an LTCC substrate and may be, for example, a wiring structure. The wiring structure is, for example, a multilayer structure. The multilayer structure includes at least one electrically insulating layer and at least one electrically conductive layer. The electrically insulating layer is formed in a predetermined pattern. When the number of the electrically insulating layers is multiple, each of the multiple electrically insulating layers is formed in a predetermined pattern determined layer by layer. The electrically conductive layer is formed in a predetermined pattern different from the predetermined pattern of the electrically insulating layer. When the number of the electrically conductive layers is multiple, each of the multiple electrically conductive layers is formed in a predetermined pattern determined layer by layer. The electrically conductive layer may include one or more rewiring portions. In the wiring structure, of two surfaces opposite to each other in the thickness direction of the multilayer structure, a first surface is the first major surface  131  of the mounting substrate  130 , and a second surface is the second major surface  132  of the mounting substrate  130 . The wiring structure may be, for example, an interposer. The interposer may be an interposer using a silicon substrate or may be a substrate made up of multiple layers. 
     The first major surface  131  and the second major surface  132  of the mounting substrate  130  are spaced apart in the thickness direction D 1  of the mounting substrate  130  and intersect with the thickness direction D 1  of the mounting substrate  130 . The first major surface  131  of the mounting substrate  130  is, for example, orthogonal to the thickness direction D 1  of the mounting substrate  130 . The first major surface  131  may include, for example, the side surface or the like of the conductor portion as a surface not orthogonal to the thickness direction D 1 . The second major surface  132  of the mounting substrate  130  is, for example, orthogonal to the thickness direction D 1  of the mounting substrate  130 . The second major surface  132  may include, for example, the side surface or the like of the conductor portion as a surface not orthogonal to the thickness direction D 1 . The first major surface  131  and the second major surface  132  of the mounting substrate  130  may have minute irregularities or a recessed portion or a protruding portion. When, for example, the first major surface  131  of the mounting substrate  130  has a recessed portion, the inner surface of the recessed portion is included in the first major surface  131 . The mounting substrate  130  has a rectangular shape in plan view in the thickness direction D 1  of the mounting substrate  130 ; however, the configuration is not limited thereto. The mounting substrate  130  may have, for example, a square shape. 
     In the radio-frequency module  100  according to the first embodiment, the circuit components of a first group are mounted on the first major surface  131  of the mounting substrate  130 . As shown in  FIG.  1   , the circuit components of the first group include the four transmission filters  1 , the six receiving filters  2 , the power amplifier  3 , five circuit elements  42  of the output matching circuit  4 , the six input matching circuits  17 , the four first matching circuits  6 , and the three second matching circuits  8 . Here, the phrase “the circuit components are mounted on the first major surface  131  of the mounting substrate  130 ” includes not only a structure that the circuit components are disposed on (mechanically connected to) the first major surface  131  of the mounting substrate  130  but also the circuit components are electrically connected to (appropriate conductor portions of) the mounting substrate  130 . In the radio-frequency module  100 , the circuit components of a second group are mounted on the second major surface  132  of the mounting substrate  130 . The circuit components of the second group include the first switch  5 , the second switch  7 , the controller  19 , and the low-noise amplifier  18 . Here, the phrase “the circuit components are mounted on the second major surface  132  of the mounting substrate  130 ” includes not only a structure that the circuit components are disposed on (mechanically connected to) the second major surface  132  of the mounting substrate  130  but also the circuit components are electrically connected to (appropriate conductor portions of) the mounting substrate  130 . The second balun  41  of the output matching circuit  4  is provided on the mounting substrate  130 . 
     Each of the plurality of transmission filters  1  and the plurality of receiving filters  2  is, for example, a ladder filter. Each of the plurality of transmission filters  1  and the plurality of receiving filters  2  has a plurality of (for example, four) series arm resonators and a plurality of (for example, three) parallel arm resonators. 
     Each of the plurality of transmission filters  1  and the plurality of receiving filters  2  is, for example, an acoustic wave filter. The acoustic wave filter is configured such that each of a plurality of series arm resonators and a plurality of parallel arm resonators is made up of an acoustic wave resonator. The acoustic wave filter is, for example, a surface acoustic wave filter that uses surface acoustic waves. 
     In the surface acoustic wave filter, each of the plurality of series arm resonators and the plurality of parallel arm resonators is, for example, a surface acoustic wave (SAW) resonator. 
     A surface acoustic wave filter has, for example, a piezoelectric substrate, a plurality of interdigital transducer (IDT) electrodes formed on the piezoelectric substrate and provided in a one-to-one correspondence with a plurality of series arm resonators, and a plurality of interdigital transducer electrodes formed on the piezoelectric substrate and provided in a one-to-one correspondence with a plurality of parallel arm resonators. The piezoelectric substrate is, for example, a piezoelectric substrate. The piezoelectric substrate is, for example, a lithium niobate substrate, a lithium tantalate substrate, or a quartz crystal substrate. The piezoelectric substrate is not limited to the piezoelectric substrate. The piezoelectric substrate may be, for example, a multilayer substrate including a silicon substrate, a high acoustic velocity film on the silicon substrate, a low acoustic velocity film on the high acoustic velocity film, and a piezoelectric layer on the low acoustic velocity film. In the multilayer substrate, the material of the piezoelectric layer is, for example, lithium niobate or lithium tantalate. The low acoustic velocity film is a film through which a bulk wave propagates at an acoustic velocity lower than a bulk wave propagates through the piezoelectric layer. The material of the low acoustic velocity film is, for example, silicon oxide. The high acoustic velocity film is a film through which a bulk wave propagates at an acoustic velocity higher than an acoustic wave propagates through the piezoelectric layer. The material of the high acoustic velocity film is, for example, silicon nitride. 
     In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of each of the plurality of transmission filters  1  and the plurality of receiving filters  2  is a rectangular shape. 
     The power amplifier  3  is a power amplifier IC chip including a circuit portion having the driver stage amplifier  31 , the two final stage amplifiers  32 A,  32 B, and the first balun  33 . The power amplifier  3  is flip-chip mounted on the first major surface  131  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of the power amplifier  3  is a rectangular shape. Each of the driver stage amplifier  31 , the final stage amplifier  32 A, and the final stage amplifier  32 B includes an amplifier transistor. The amplifier transistor is, for example, a heterojunction bipolar transistor (HBT). In this case, the power amplifier IC chip that makes up the power amplifier  3  is, for example, a GaAs IC chip. The amplifier transistor is not limited to a bipolar transistor, such as a HBT, and may be, for example, a field effect transistor (FET). The FET is, for example, metal-oxide-semiconductor field effect transistor (MOSFET). The power amplifier IC chip that makes up the power amplifier  3  is not limited to a GaAs IC chip and may be, for example, an Si IC chip, an SiGe IC chip, or a GaN IC chip. 
     The second balun  41  of the output matching circuit  4  is provided on the mounting substrate  130 . As described above, the second balun  41  has the plurality of inductor elements L 1  to L 4 . The inductor elements L 3 , L 4  are provided in the mounting substrate  130 . The inductor element L 1  is provided on the first major surface  131  of the mounting substrate  130  so as to overlap the inductor elements L 3 , L 4  in plan view in the thickness direction D 1  of the mounting substrate  130 . The inductor element L 2  is provided in the mounting substrate  130  so as to overlap the inductor elements L 3 , L 4  in plan view in the thickness direction D 1  of the mounting substrate  130 . In the thickness direction D 1  of the mounting substrate  130 , the inductor element L 2  is located on an opposite side to the inductor element L 1  when viewed from the inductor elements L 3 , L 4 . 
     The five circuit elements  42  of the output matching circuit  4  each are an inductor or a capacitor. In plan view in the thickness direction D 1  of the mounting substrate  130 , the circuit element  42  disposed between the two transmission filters  1  (transmission filters  11 ,  12 ) is, for example, an inductor. 
     In  FIG.  1   , the LC resonant circuit is not shown; however, the capacitor C 1  of the LC resonant circuit is mounted on the first major surface  131  of the mounting substrate  130 . The inductors Lc 1 , Lc 2  of the LC resonant circuit are provided on the mounting substrate  130 . 
     As shown in  FIG.  2   , the low-noise amplifier  18  is mounted on the second major surface  132  of the mounting substrate  130 . In the radio-frequency module  100  according to the first embodiment, an IC chip  180  (hereinafter, also referred to as first IC chip  180 ) including the low-noise amplifier  18  and the second switch  7  is mounted on the second major surface  132  of the mounting substrate  130 . Here, the first IC chip  180  is flip-chip mounted on the second major surface  132  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of the first IC chip  180  is a rectangular shape. The six amplifier transistors of the low-noise amplifier  18  are field effect transistors; however, the configuration is not limited thereto. The six amplifier transistors of the low-noise amplifier  18  may be, for example, bipolar transistors. The first IC chip  180  is an Si IC chip; however, the configuration is not limited thereto. 
     The circuit component (inductor) of each of the six input matching circuits  17  is, for example, a chip inductor. The circuit component of each of the six input matching circuits  17  is, for example, mounted on the first major surface  131  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of the circuit component of each of the six input matching circuits  17  is a rectangular shape. Each of the six input matching circuits  17  may include an internal layer inductor provided in the mounting substrate  130 . 
     As shown in  FIG.  2   , the first switch  5  is mounted on the second major surface  132  of the mounting substrate  130 . In the radio-frequency module  100  according to the first embodiment, an IC chip  55  (hereinafter, also referred to as second IC chip  55 ) including the first switch  5  and the controller  19  is mounted on the second major surface  132  of the mounting substrate  130 . Here, the second IC chip  55  is flip-chip mounted on the second major surface  132  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of the second IC chip  55  is a rectangular shape. The second IC chip  55  is an Si IC chip; however, the configuration is not limited thereto. 
     The circuit component (inductor) of each of the four first matching circuits  6  is, for example, a chip inductor. The circuit component of each of the four first matching circuits  6  is, for example, mounted on the first major surface  131  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of the circuit component of each of the four first matching circuits  6  is a rectangular shape. Each of the four first matching circuits  6  may include an internal layer inductor provided in the mounting substrate  130 . 
     The circuit component (inductor) of each of the three second matching circuits  8  is, for example, a chip inductor. The circuit component of each of the three second matching circuits  8  is, for example, mounted on the first major surface  131  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , the outer peripheral shape of the circuit component of each of the three second matching circuits  8  is a rectangular shape. Each of the three second matching circuits  8  may include an internal layer inductor provided in the mounting substrate  130 . 
     The plurality of external connection terminals  9  is disposed on the second major surface  132  of the mounting substrate  130 . Here, the phrase “the external connection terminals  9  are disposed on the second major surface  132  of the mounting substrate  130 ” includes not only the structure that the external connection terminals  9  are mechanically connected to the second major surface  132  of the mounting substrate  130  but also the structure that the external connection terminals  9  are electrically connected to (appropriate conductor portions of) the mounting substrate  130 . The material of the plurality of external connection terminals  9  is, for example, metal (for example, copper, copper alloy, or the like). Each of the plurality of external connection terminals  9  is a columnar electrode. The columnar electrode is, for example, a cylindrical electrode. The plurality of external connection terminals  9  is bonded to the conductor portions of the mounting substrate  130  by, for example, solder; however, the configuration is not limited thereto. The plurality of external connection terminals  9  may be bonded by using, for example, an electrically conductive adhesive (for example, electrically conductive paste) or may be directly bonded. 
     As described above, the plurality of external connection terminals  9  includes the three antenna terminals  91 A,  91 B,  91 C, the signal input terminal  92 , the signal output terminal  93 , the control terminal  94 , and the plurality of ground terminals  95 . The plurality of ground terminals  95  is electrically connected to the ground layer of the mounting substrate  130 . The ground layer is a circuit ground of the radio-frequency module  100 . The plurality of circuit components of the radio-frequency module  100  includes circuit components electrically connected to the ground layer. 
     The first resin layer  15  covers each of the circuit components of the first group, mounted on the first major surface  131  of the mounting substrate  130 , on the first major surface  131  side of the mounting substrate  130 . The first resin layer  15  includes resin (for example, epoxy resin). The first resin layer  15  may include a filler in addition to resin. 
     The second resin layer  20  covers each of the circuit components of the second group, mounted on the second major surface  132  of the mounting substrate  130 , and the outer peripheral surface of each of the plurality of external connection terminals  9 , on the second major surface  132  side of the mounting substrate  130 . The second resin layer  20  includes resin (for example, epoxy resin). The second resin layer  20  may include a filler in addition to resin. The material of the second resin layer  20  may be the same material as the material of the first resin layer  15  or may be a different material. 
     The shield layer  16  covers the first resin layer  15  and the four transmission filters  1 . As shown in  FIG.  4   , of the four transmission filters  1 , the major surface  102  of each of the two transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . The shield layer  16  has an electrical conductivity. The shield layer  16  has a multilayer structure in which a plurality of metal layers is laminated; however, the configuration is not limited thereto. The shield layer  16  may be a single metal layer. The metal layer includes one or more types of metals. The shield layer  16  covers a major surface  151  of the first resin layer  15  on an opposite side to the mounting substrate  130  side, an outer peripheral surface  153  of the first resin layer  15 , and an outer peripheral surface  133  of the mounting substrate  130 . The shield layer  16  also covers an outer peripheral surface  203  of the second resin layer  20 . The shield layer  16  is in contact with at least part of the outer peripheral surface of the ground layer of the mounting substrate  130 . Thus, the potential of the shield layer  16  can be set to the same potential as the potential of the ground layer. 
     (1.3) Layout of Circuit Components in Radio-Frequency Module 
     Next, the layout of the circuit components in the radio-frequency module  100  according to the first embodiment will be described with reference to  FIGS.  1  to  4   . 
     In the radio-frequency module  100 , in plan view in the thickness direction D 1  of the mounting substrate  130 , in a direction (up and down direction in  FIG.  1   ) parallel to the direction in which the output matching circuit  4  and the power amplifier  3  are arranged, the plurality of transmission filters  1  is arranged from the output matching circuit  4  side (upper side) in order of the transmission filter  11 , the transmission filter  12 , the transmission filter  13 , and the transmission filter  14 . 
     In the radio-frequency module  100 , in plan view in the thickness direction D 1  of the mounting substrate  130 , the four transmission filters  1  are located between the output matching circuit  4  and the six input matching circuits  17 . 
     In the radio-frequency module  100 , in plan view in the thickness direction D 1  of the mounting substrate  130 , the four transmission filters  1  are located between the output matching circuit  4  and the six first matching circuits  6 . 
     In the radio-frequency module  100 , in plan view in the thickness direction D 1  of the mounting substrate  130 , the four transmission filters  1  are located between the output matching circuit  4  and the three second matching circuits  8 . 
     In the radio-frequency module  100 , the first IC chip  180  does not overlap the plurality of transmission filters  1  in plan view in the thickness direction D 1  of the mounting substrate  130 . 
     In the radio-frequency module  100 , at least one (two in the illustrated example) of the plurality of transmission filters  1 ) overlaps the second IC chip  55  in plan view in the thickness direction D 1  of the mounting substrate  130 . In plan view in the thickness direction D 1  of the mounting substrate  130 , part of each of the transmission filters  12 ,  13  overlaps part of the second IC chip  55 ; however, the configuration is not limited thereto. The entire part of each of the transmission filters  12 ,  13  may overlap part of the second IC chip  55 . The entire part of each of the transmission filters  12 ,  13  may overlap the entire part of the second IC chip  55 . 
     In the radio-frequency module  100 , the power amplifier  3  does not overlap the low-noise amplifier  18  in plan view in the thickness direction D 1  of the mounting substrate  130 . 
     The circuit configuration of the radio-frequency module  100  has a transmitting circuit for transmitting a transmission signal and a receiving circuit for receiving a reception signal. In the radio-frequency module  100 , of the plurality of circuit components, circuit components included only in the transmitting circuit do not overlap the other circuit components (circuit components included only in the receiving circuit and circuit components shared between the transmitting circuit and the receiving circuit) in the thickness direction D 1  of the mounting substrate  130 . Of the plurality of circuit components, a group of the circuit components included only in the transmitting circuit includes the four transmission filters  1 , the power amplifier  3 , the output matching circuit  4 , and the second IC chip  55 . Of the plurality of circuit components, a group of the circuit components included only in the receiving circuit includes the six receiving filters  2 , the six input matching circuits  17 , and the low-noise amplifier  18 . A group of the circuit components shared between the transmitting circuit and the receiving circuit includes the second switch  7 , the four first matching circuits  6 , and the three second matching circuits  8 . 
     In plan view in the thickness direction D 1  of the mounting substrate  130 , the radio-frequency module  100  is divided into a first region and a second region. In the first region, a group of circuit components included only in the transmitting circuit of the plurality of circuit components is disposed. In the second region, a group of circuit components included only in the receiving circuit and a group of circuit components shared between the transmitting circuit and the receiving circuit are disposed. 
     (1.4) Manufacturing Method for Radio-Frequency Module 
     Next, a manufacturing method for the radio-frequency module  100  according to the first embodiment will be described. 
     The manufacturing method for the radio-frequency module  100  may adopt, for example, a manufacturing method including a first process, a second process, a third process, a fourth process, and a fifth process. The first process is a process in which the plurality of circuit components is mounted on the mounting substrate  130  and the plurality of external connection terminals  9  is disposed. The second process is a process in which a first resin material layer that covers the plurality of transmission filters  1  and the like and that is a source of the first resin layer  15  is formed on the first major surface  131  side of the mounting substrate  130  and a second resin material layer that is a source of the second resin layer  20  is formed on the second major surface  132  side of the mounting substrate  130 . The third process is a process in which the first resin layer  15  is formed and the thickness of each of the piezoelectric substrates is reduced by grinding the first resin material layer from the major surface of the first resin material layer on an opposite side to the mounting substrate  130  side to expose the piezoelectric substrates of the two transmission filters  13 ,  14  of the plurality of transmission filters  1 , and then grinding the first resin material layer and the piezoelectric substrates. The fourth process is a process in which the second resin layer  20  is formed by grinding the second resin material layer from the major surface of the second resin material layer on an opposite side to the mounting substrate  130  side to expose the distal ends of the plurality of external connection terminals  9  and then grinding the second resin material layer and the external connection terminals  9 . The fifth process is a process in which the shield layer  16  that is in contact with the major surface  151  of the first resin layer  15  and the major surface  102  of each of the two transmission filters  13 ,  14  of the plurality of transmission filters  1  on an opposite side to the mounting substrate  130  side is formed by, for example, sputtering, vapor deposition, or printing. 
     (2) Advantageous Effects 
     (2.1) Radio-Frequency Module 
     The radio-frequency module  100  according to the first embodiment includes a mounting substrate  130 , first transmission filters  11 ,  12 , second transmission filters  13 ,  14 , a resin layer  15 , and a shield layer  16 . The mounting substrate  130  has a first major surface  131  and a second major surface  132  opposite to each other. The first transmission filters  11 ,  12  are mounted on the first major surface  131  of the mounting substrate  130 . The second transmission filters  13 ,  14  are mounted on the first major surface  131  of the mounting substrate  130  and are higher in power class than the first transmission filters  11 ,  12 . The resin layer  15  is disposed on the first major surface  131  of the mounting substrate  130 . The shield layer  16  covers at least part of the resin layer  15 . The resin layer  15  covers at least part of an outer peripheral surface  103  of each of the first transmission filters  11 ,  12  and covers at least part of an outer peripheral surface  103  of each of the second transmission filters  13 ,  14 . The shield layer  16  overlaps at least part of each of the second transmission filters  13 ,  14  in plan view in a thickness direction D 1  of the mounting substrate  130 . At least part of a major surface  102  of each of the second transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . In other words, at least part of an area covered with the shield layer  16  on the major surface  102  of each of the second transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     The radio-frequency module  100  according to the first embodiment includes a mounting substrate  130 , transmission filters  13 ,  14 , a resin layer  15 , and a shield layer  16 . The mounting substrate  130  has a first major surface  131  and a second major surface  132  opposite to each other. Each of the transmission filters  13 ,  14  is at least one transmission filter of a power class 1 transmission filter and a power class 2 transmission filter, mounted on the first major surface  131  of the mounting substrate  130 . The resin layer  15  is disposed on the first major surface  131  of the mounting substrate  130 . The shield layer  16  covers at least part of the resin layer  15 . The resin layer  15  covers at least part of an outer peripheral surface  103  of each of the transmission filters  13 ,  14 . The shield layer  16  overlaps at least part of each of the transmission filters  13 ,  14  in plan view in a thickness direction D 1  of the mounting substrate  130 . At least part of a major surface  102  of each of the transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . In other words, at least part of an area covered with the shield layer  16  on the major surface  102  of each of the transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     In the radio-frequency module  100  according to the first embodiment, as described above, at least part of the major surface  102  of each of the (second) transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . Therefore, the heat generated in the (second) transmission filters  13 ,  14  can be dissipated through the shield layer  16 . Thus, it is possible to improve the heat dissipation capability. The radio-frequency module  100  according to the first embodiment is capable of stabilizing the temperature characteristics of an acoustic wave filter that makes up each of the (second) transmission filters  13 ,  14  and is capable of stabilizing the characteristics of the radio-frequency module  100 . 
     In the radio-frequency module  100  according to the first embodiment, the major surface  102  of each of the transmission filters  11 ,  12  with a relatively low power class on an opposite side to the mounting substrate  130  side is not in contact with the shield layer  16 . Thus, a printable area on the radio-frequency module  100  is increased. In addition, the thickness of the piezoelectric substrate of each of the transmission filters  11 ,  12  does not need to be increased by not bringing the major surface  102  of each of the transmission filters  11 ,  12  into contact with the shield layer  16 , so an increase in the material cost is suppressed. 
     In the radio-frequency module  100  according to the first embodiment, from the viewpoint of improving the heat dissipation capability, the shield layer  16  is preferably in contact with the entire area of the major surface  102  of each of the transmission filters  13 ,  14  of the plurality of transmission filters  1  on an opposite side to the mounting substrate  130  side. However, the condition that the shield layer  16  is in contact with the entire surface of the major surface  102  of each of the transmission filters  13 ,  14  is not indispensable. 
     (2.2) Communication Device 
     The communication device  300  according to the first embodiment includes a signal processing circuit  301  and the radio-frequency module  100 . The signal processing circuit  301  is connected to the radio-frequency module  100 . 
     The communication device  300  according to the first embodiment includes the radio-frequency module  100 , so it is possible to improve the heat dissipation capability. 
     A plurality of electronic components that make up the signal processing circuit  301  may be mounted on, for example, the above-described circuit board or may be mounted on a circuit board (second circuit board) different from the circuit board (first circuit board) on which the radio-frequency module  100  is mounted. 
     (3) Modifications 
     (3.1) First Modification 
     A radio-frequency module  100   a  according to a first modification of the first embodiment will be described with reference to  FIG.  7   . For the radio-frequency module  100   a  according to the first modification, like reference signs denote component elements similar to those of the radio-frequency module  100  according to the first embodiment, and the description is omitted. The circuit configuration of the radio-frequency module  100   a  is similar to the circuit configuration of the radio-frequency module  100  according to the first embodiment described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100   a  according to the first modification differs from the radio-frequency module  100  according to the first embodiment in that the major surface  102  of each of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     In the radio-frequency module  100   a  according to the first modification, as in the case of the radio-frequency module  100  according to the first embodiment, the major surface  102  of each of the power class 2 transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 , so it is possible to improve the heat dissipation capability. 
     In the radio-frequency module  100   a  according to the first modification, the major surface  102  of each of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is also in contact with the shield layer  16 , so it is possible to further improve the heat dissipation capability. 
     (3.2) Second Modification 
     A radio-frequency module  100   b  according to a second modification of the first embodiment will be described with reference to  FIG.  8   . For the radio-frequency module  100   b  according to the second modification, like reference signs denote component elements similar to those of the radio-frequency module  100  according to the first embodiment, and the description is omitted. The circuit configuration of the radio-frequency module  100   b  is similar to the circuit configuration of the radio-frequency module  100  according to the first embodiment described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100   b  according to the second modification differs from the radio-frequency module  100  according to the first embodiment in that the radio-frequency module  100   b  includes contact members  140 A respectively disposed on the major surfaces  102  of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side. 
     In plan view in the thickness direction D 1  of the mounting substrate  130 , each of the plurality of contact members  140 A has a rectangular shape; however, the configuration is not limited thereto. In plan view in the thickness direction D 1  of the mounting substrate  130 , each of the plurality of contact members  140 A has the same size as a corresponding one of the transmission filters  1 , with which the contact member  140 A contacts; however, the configuration is not limited thereto. Each of the plurality of contact members  140 A may be larger than or may be smaller than a corresponding one of the transmission filters  1 , with which the contact member  140 A contacts. The material of the plurality of contact members  140 A is, for example, copper or copper alloy. The plurality of contact members  140 A may be respectively bonded to the major surfaces  102  of the transmission filters  1  or may be just respectively in contact with the major surfaces  102 . The materials of the plurality of contact members  140 A are preferably the same and may be different from each other. 
     In the radio-frequency module  100   b  according to the second modification, as in the case of the radio-frequency module  100  according to the first embodiment, the major surface  102  of each of the power class 2 transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 , so it is possible to improve the heat dissipation capability. 
     In the radio-frequency module  100   b  according to the second modification, the major surface  102  of each of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  with the contact member  140 A interposed therebetween, so it is possible to further improve the heat dissipation capability. 
     (3.3) Third Modification 
     A radio-frequency module  100   c  according to a third modification of the first embodiment will be described with reference to  FIG.  9   . For the radio-frequency module  100   c  according to the third modification, like reference signs denote component elements similar to those of the radio-frequency module  100  according to the first embodiment, and the description is omitted. The circuit configuration of the radio-frequency module  100   c  is similar to the circuit configuration of the radio-frequency module  100  according to the first embodiment described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100   c  according to the third modification differs from the radio-frequency module  100  according to the first embodiment in that the plurality of external connection terminals  9  is ball bumps. The radio-frequency module  100   c  according to the third modification differs from the radio-frequency module  100  according to the first embodiment in that the radio-frequency module  100   c  according to the third modification does not include the second resin layer  20  of the radio-frequency module  100  according to the first embodiment. The radio-frequency module  100   c  according to the third modification may include an underfill portion provided between the second major surface  132  of the mounting substrate  130  and the first IC chip  180  mounted on the second major surface  132  of the mounting substrate  130  and an underfill portion provided between the second major surface  132  of the mounting substrate  130  and the second IC chip  55  mounted on the second major surface  132  of the mounting substrate  130 . 
     The material of the ball bump that makes up each of the plurality of external connection terminals  9  is, for example, gold, copper, solder, or the like. 
     The plurality of external connection terminals  9  may mixedly include the external connection terminals  9  each made up of a ball bump and the external connection terminals  9  each made up of a columnar electrode. 
     Second Embodiment 
     A radio-frequency module  100   d  according to a second embodiment will be described with reference to  FIG.  10   . For the radio-frequency module  100   d  according to the second embodiment, like reference signs denote component elements similar to those of the radio-frequency module  100  according to the first embodiment, and the description is omitted. The circuit configuration of the radio-frequency module  100   d  is similar to the circuit configuration of the radio-frequency module  100  according to the first embodiment described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100   d  according to the second embodiment differs from the radio-frequency module  100  according to the first embodiment in that the radio-frequency module  100   d  according to the second embodiment includes a plurality of metal members  140 . Each of the plurality of metal members  140  is disposed on the major surface  102  of each of the power class 2 transmission filters  13 ,  14  of the plurality of transmission filters  1  on an opposite side to the mounting substrate  130  side. 
     The first resin layer  15  is disposed on the first major surface  131  of the mounting substrate  130  and covers the outer peripheral surfaces  103  of the plurality of transmission filters  1  and outer peripheral surfaces  143  of the plurality of metal members  140 . The shield layer  16  covers the first resin layer  15  and the plurality of metal members  140 . The plurality of metal members  140  is in contact with the shield layer  16 . 
     In plan view in the thickness direction D 1  of the mounting substrate  130 , each of the plurality of metal members  140  has a rectangular shape; however, the configuration is not limited thereto. In plan view in the thickness direction D 1  of the mounting substrate  130 , each of the plurality of metal members  140  has the same size as a corresponding one of the transmission filters  1 , with which the metal member  140  contacts; however, the configuration is not limited thereto. Each of the plurality of metal members  140  may be larger or may be smaller than a corresponding one of the transmission filters  1 , with which the metal member  140  contacts. The material of the plurality of metal members  140  is, for example, copper or copper alloy. The plurality of metal members  140  may be respectively bonded to the major surfaces  102  of the transmission filters  1  or may be respectively in contact with the major surfaces  102 . The materials of the plurality of metal members  140  are preferably the same and may be different from each other. 
     The radio-frequency module  100   d  according to the second embodiment includes a mounting substrate  130 , first transmission filters  11 ,  12 , second transmission filters  13 ,  14 , metal members  140 , a resin layer  15 , and a shield layer  16 . The mounting substrate  130  has a first major surface  131  and a second major surface  132  opposite to each other. The first transmission filters  11 ,  12  are mounted on the first major surface  131  of the mounting substrate  130 . The second transmission filters  13 ,  14  are mounted on the first major surface  131  of the mounting substrate  130  and are higher in power class than the first transmission filters  11 ,  12 . Each of the metal members  140  is disposed on a major surface  102  of a corresponding one of the second transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side. The resin layer  15  is disposed on the first major surface  131  of the mounting substrate  130 . The shield layer  16  covers at least part of the resin layer  15 . The resin layer  15  covers at least part of an outer peripheral surface  103  of each of the first transmission filters  11 ,  12 , covers at least part of an outer peripheral surface  103  of each of the second transmission filters  13 ,  14 , and covers at least part of an outer peripheral surface  143  of each of the metal members  140 . The shield layer  16  overlaps at least part of each of the metal members  140  in plan view in the thickness direction D 1  of the mounting substrate  130 . At least part of a major surface  141  of each of the metal members  140  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . In other words, at least part of an area covered with the shield layer  16  on the major surface  141  of each of the metal members  140  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     The radio-frequency module  100   d  according to the second embodiment includes a mounting substrate  130 , transmission filters  13 ,  14 , metal members  140 , a resin layer  15 , and a shield layer  16 . The mounting substrate  130  has a first major surface  131  and a second major surface  132  opposite to each other. Each of the transmission filters  13 ,  14  is at least one transmission filter of a power class 1 transmission filter and a power class 2 transmission filter, mounted on the first major surface  131  of the mounting substrate  130 . Each of the metal members  140  is disposed on a major surface  102  of a corresponding one of the transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side. The resin layer  15  is disposed on the first major surface  131  of the mounting substrate  130 . The shield layer  16  covers at least part of the resin layer  15 . The resin layer  15  covers at least part of an outer peripheral surface  103  of each of the transmission filters  13 ,  14  and covers at least part of an outer peripheral surface  143  of each of the metal members  140 . The shield layer  16  overlaps at least part of each of the metal members  140  in plan view in the thickness direction D 1  of the mounting substrate  130 . At least part of a major surface  141  of each of the metal members  140  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . In other words, at least part of an area covered with the shield layer  16  on the major surface  141  of each of the metal members  140  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     In the radio-frequency module  100   d  according to the second embodiment, as described above, the major surface  102  of each of the (second) transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  with the metal member  140  interposed therebetween. Therefore, the heat generated in the (second) transmission filters  13 ,  14  can be dissipated through the metal members  140  and the shield layer  16 . Thus, it is possible to improve the heat dissipation capability. The radio-frequency module  100   d  according to the second embodiment is capable of stabilizing the temperature characteristics of an acoustic wave filter that makes up each of the (second) transmission filters  13 ,  14  and is capable of stabilizing the characteristics of the radio-frequency module  100 . 
     First Modification 
     A radio-frequency module  100   e  according to a first modification of the second embodiment will be described with reference to  FIG.  11   . For the radio-frequency module  100   e  according to the first modification, like reference signs denote component elements similar to those of the radio-frequency module  100   d  according to the second embodiment, and the description is omitted. The circuit configuration of the radio-frequency module  100   e  is similar to the circuit configuration of the radio-frequency module  100  according to the first embodiment described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100   e  according to the first modification differs from the radio-frequency module  100   d  according to the second embodiment in that the radio-frequency module  100   e  according to the first modification further includes contact members  140 A respectively disposed on the major surfaces  102  of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side. 
     In the radio-frequency module  100   e  according to the first modification, as in the case of the radio-frequency module  100  according to the second embodiment, the major surface  102  of each of the power class 2 transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  with the metal member  140  interposed therebetween, so it is possible to improve the heat dissipation capability. 
     In the radio-frequency module  100   e  according to the first modification, the major surface  102  of each of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  with the contact member  140 A interposed therebetween, so it is possible to further improve the heat dissipation capability. 
     Second Modification 
     A radio-frequency module  100   f  according to a second modification of the second embodiment will be described with reference to  FIG.  12   . For the radio-frequency module  100   f  according to the second modification, like reference signs denote component elements similar to those of the radio-frequency module  100   d  according to the second embodiment, and the description is omitted. The circuit configuration of the radio-frequency module  100   f  is similar to the circuit configuration of the radio-frequency module  100  according to the first embodiment described with reference to  FIGS.  5  and  6   . 
     The radio-frequency module  100   f  according to the second modification differs from the radio-frequency module  100   d  according to the second embodiment in that the major surface  102  of each of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     In the radio-frequency module  100   f  according to the second modification, as in the case of the radio-frequency module  100   d  according to the second embodiment, the major surface  102  of each of the power class 2 transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  with the metal member  140  interposed therebetween, so it is possible to improve the heat dissipation capability. 
     In the radio-frequency module  100   f  according to the second modification, the major surface  102  of each of the power class 3 transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 , so it is possible to further improve the heat dissipation capability. 
     Other Modifications 
     Each of the above-described first and second embodiments and the like is just one of various embodiments of the present disclosure. The above-described first and second embodiments, and the like, each may be modified into various forms according to design, or the like, as long as the possible benefit of the present disclosure is achieved. 
     For example, the number of the transmission filters  1  just needs to be multiple and is not limited to four. The major surface  102  of each of the relatively high power class transmission filters  1  of the plurality of transmission filters  1  on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16 , and a transmission filter  1  of which the major surface  102  is covered with the first resin layer  15  may be included. 
     Each of the plurality of transmission filters  1  and the plurality of receiving filters  2  may be a filter that is a component of a duplexer. In other words, the transmission filter  11  and the receiving filter  21  may make up a first duplexer, the transmission filter  12  and the receiving filter  22  may make up a second duplexer, the transmission filter  13  and the receiving filter  23  may make up a third duplexer, and the transmission filter  14  and the receiving filter  24  may make up a fourth duplexer. In this case, at least the major surface of each of the third duplexer and the fourth duplexer on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16  directly or indirectly (with the metal member  140  interposed therebetween). 
     In the radio-frequency module  100  according to the first embodiment, the major surface  102  of each of the transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side and the major surface  151  of the resin layer  15  are substantially flush with each other; however, the configuration is not limited thereto. 
     For example, each of the plurality of transmission filters  1  and the plurality of receiving filters  2  is not limited to a surface acoustic wave filter and may be, for example, a bulk acoustic wave (BAW) filter. A resonator in the BAW filter is, for example, a film bulk acoustic resonator (FBAR) or a solidly mounted resonator (SMR). The BAW filter has a substrate. The substrate is, for example, a silicon substrate. 
     Each of the plurality of transmission filters  1  and the plurality of receiving filters  2  is not limited to a ladder filter and may be, for example, a longitudinally coupled resonator-type surface acoustic wave filter. 
     The above-described acoustic wave filter is an acoustic wave filter that uses surface acoustic waves or bulk acoustic waves; however, the configuration is not limited thereto. The above-described acoustic wave filter may be, for example, an acoustic wave filter that uses boundary acoustic waves, plate waves, or the like. 
     The power amplifier  3  is not limited to a differential amplifier circuit. The power amplifier  3  may have a configuration including a driver stage amplifier, an output stage amplifier, and an inter-stage matching circuit that matches the impedance between the driver stage amplifier and the output stage amplifier. In this case, the inter-stage matching circuit is, for example, an inductor provided between the driver stage amplifier and the output stage amplifier and may further include a capacitor in addition to the inductor. The number of the stages of the amplifier in the power amplifier  3  is not limited to two and may be one or may be three or more. 
     The number of the input matching circuits  17  is not limited to multiple and may be one. 
     The plurality of circuit components may include a circuit component electrically connected to the mounting substrate  130  with a bump interposed therebetween and a circuit component electrically connected to the mounting substrate  130  with solder interposed therebetween. Alternatively, for example, the plurality of circuit components may include a circuit component electrically connected to the mounting substrate  130  with a bonding wire interposed therebetween. 
     The radio-frequency module  100  may further include a heat dissipation conductor portion disposed on the second major surface  132  of the mounting substrate  130  and overlapping the power amplifier  3  in the thickness direction D 1  of the mounting substrate  130 . One ends of the plurality of external connection terminals  9  may make up the heat dissipation conductor portion. 
     In the radio-frequency module  100  according to the first embodiment and the radio-frequency module  100   d  according to the second embodiment, the major surface  102  of each of the plurality of transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  directly or indirectly (with the metal member  140  interposed therebetween); however, the configuration is not limited thereto. Alternatively, for example, the major surface  102  of one of the plurality of transmission filters  13 ,  14  may be in contact with the shield layer  16  directly or indirectly. 
     Furthermore, in the radio-frequency module  100   a  according to the first modification of the first embodiment, the radio-frequency module  100   b  according to the second modification of the first embodiment, the radio-frequency module  100   e  according to the first modification of the second embodiment, and the radio-frequency module  100   f  according to the second modification of the second embodiment, the major surface  102  of each of the plurality of transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16  directly or indirectly (with the metal member  140  interposed therebetween); however, the configuration is not limited thereto. Alternatively, for example, the major surface  102  of one of the plurality of transmission filters  11 ,  12  may be in contact with the shield layer  16  directly or indirectly. 
     In the radio-frequency modules  100 ,  100   a  to  100   f , the entire part of the outer peripheral surface  103  of each of the transmission filters  11 ,  12 ,  13 ,  14  is covered with the first resin layer  15 . Alternatively, part of the outer peripheral surface  103  may be covered with the first resin layer  15 . In the radio-frequency modules  100 ,  100   a  to  100   c , the entire part of the major surface  102  of each of the transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . Alternatively, part of the major surface  102  may be in contact with the shield layer  16 . 
     In the radio-frequency modules  100   d  to  100   f , the entire part of the outer peripheral surface  143  of each of the plurality of metal members  140  is covered with the first resin layer  15 . Alternatively, part of the outer peripheral surface  143  may be covered with the first resin layer  15 . In the radio-frequency modules  100   d  to  100   f , the entire part of the major surface  142  of each of the plurality of metal members  140  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . 
     Alternatively, part of the major surface  142  may be in contact with the shield layer  16 . 
     In the radio-frequency modules  100   a ,  100   f , the entire part of the major surface  102  of each of the transmission filters  11 ,  12  on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . Alternatively, part of the major surface  102  may be in contact with the shield layer  16 . In the radio-frequency modules  100   b ,  100   e , the entire part of the major surface  142  of each of the plurality of contact members  140 A on an opposite side to the mounting substrate  130  side is in contact with the shield layer  16 . Alternatively, part of the major surface  142  may be in contact with the shield layer  16 . 
     In the radio-frequency modules  100 ,  100   a  to  100   c , the entire part of the major surface  102  of each of the transmission filters  13 ,  14  on an opposite side to the mounting substrate  130  side is covered with the shield layer  16 . Alternatively, part of the major surface  102  may be covered with the shield layer  16 . In the radio-frequency modules  100   d  to  100   f , the entire part of the major surface  142  of each of the plurality of metal members  140  on an opposite side to the mounting substrate  130  side is covered with the shield layer  16 . Alternatively, part of the major surface  142  may be covered with the shield layer  16 . 
     Each of the radio-frequency modules  100 ,  100   a  to  100   f  includes the power class 3 transmission filters  11 ,  12  and the power class 2 transmission filters  13 ,  14 ; however the configuration is not limited thereto. A radio-frequency module may include, for example, a power class 1 transmission filter, a power class 2 transmission filter, and a power class 3 transmission filter. In this case, at least, at least part of the major surface of the power class 1 transmission filter on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16 , and at least part of the major surface of each of the power class 2 transmission filter and the power class 3 transmission filter on an opposite side to the mounting substrate  130  side may be in contact with the shield layer  16  or does not need to be in contact with the shield layer  16 . 
     Furthermore, a radio-frequency module may include, for example, a power class 1 transmission filter and a power class 2 transmission filter. In this case, at least, at least part of the major surface of the power class 1 transmission filter on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16 , and at least part of the major surface of the power class 2 transmission filter on an opposite side to the mounting substrate  130  side may be in contact with the shield layer  16  or does not need to be in contact with the shield layer  16 . 
     Furthermore, a radio-frequency module may include, for example, a power class 1 transmission filter and a power class 3 transmission filter. In this case, at least, at least part of the major surface of the power class 1 transmission filter on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16 , and at least part of the major surface of the power class 3 transmission filter on an opposite side to the mounting substrate  130  side may be in contact with the shield layer  16  or does not need to be in contact with the shield layer  16 . 
     A radio-frequency module may include, for example, only a plurality of power class 1 transmission filters. In this case, at least part of the major surface of at least one of the plurality of power class 1 transmission filters on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16 . A radio-frequency module may include, for example, only a plurality of power class 2 transmission filters. In this case, at least part of the major surface of at least one of the plurality of power class 2 transmission filters on an opposite side to the mounting substrate  130  side just needs to be in contact with the shield layer  16 . 
     In the radio-frequency modules  100 ,  100   a  to  100   f , the first communication band is 5G NR standard n3, and the second communication band is 5G NR standard n1; however, the configuration is not limited thereto. Each of the first communication band and the second communication band just needs to be, for example, any one of 5G NR standard n1, n3, n25, n66. In the radio-frequency modules  100 ,  100   a  to  100   f , the fifth communication band is 3GPP LTE standard Band 34 and the sixth communication band is 3GPP LTE standard Band 39; however, the configuration is not limited thereto. Each of the fifth communication band and the sixth communication band just needs to be, for example, any one of 3GPP LTE standard Band 34, Band 39, Band 7, Band 30, Band 11, Band 21, and Band 32. 
     The circuit configuration of each of the radio-frequency modules  100 ,  100   a ,  100   b ,  100   c ,  100   d ,  100   e ,  100   f  is not limited to the above-described example. Each of the radio-frequency modules  100 ,  100   a ,  100   b ,  100   c ,  100   d ,  100   e ,  100   f  may have, for example, a radio-frequency front-end circuit that supports multi input multi output (MIMO) as a circuit configuration. 
     The communication device  300  according to the first embodiment may include any one of the radio-frequency modules  100   a ,  100   b ,  100   c ,  100   d ,  100   e ,  100   f  instead of the radio-frequency module  100 . 
     ASPECTS 
     The following aspects are disclosed in the specification. 
     A radio-frequency module ( 100 ;  100   a ;  100   b ) according to a first aspect includes a mounting substrate ( 130 ), a first transmission filter ( 11 ,  12 ), a second transmission filter ( 13 ,  14 ), a resin layer ( 15 ), and a shield layer ( 16 ). The mounting substrate ( 130 ) has a first major surface ( 131 ) and a second major surface ( 132 ) opposite to each other. The first transmission filter ( 11 ,  12 ) is mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ). The second transmission filter ( 13 ,  14 ) is mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ) and is higher in power class than the first transmission filter ( 11 ,  12 ). The resin layer ( 15 ) is disposed on the first major surface ( 131 ) of the mounting substrate ( 130 ). The shield layer ( 16 ) covers at least part of the resin layer ( 15 ). The resin layer ( 15 ) covers at least part of an outer peripheral surface ( 103 ) of the first transmission filter ( 11 ,  12 ) and covers at least part of an outer peripheral surface ( 103 ) of the second transmission filter ( 13 ,  14 ). The shield layer ( 16 ) overlaps at least part of the second transmission filter ( 13 ,  14 ) in plan view in a thickness direction (D 1 ) of the mounting substrate ( 130 ). At least part of a major surface ( 102 ) of the second transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ). 
     According to this aspect, at least part of the major surface ( 102 ) of the second transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ), so it is possible to dissipate the heat generated in the second transmission filter ( 13 ,  14 ) through the shield layer ( 16 ), with the result that it is possible to improve the heat dissipation capability. 
     A radio-frequency module ( 100   d ;  100   e ;  100   f ) according to a second aspect includes a mounting substrate ( 130 ), a first transmission filter ( 11 ,  12 ), a second transmission filter ( 13 ,  14 ), a metal member ( 140 ), a resin layer ( 15 ), and a shield layer ( 16 ). The mounting substrate ( 130 ) has a first major surface ( 131 ) and a second major surface ( 132 ) opposite to each other. The first transmission filter ( 11 ,  12 ) is mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ). The second transmission filter ( 13 ,  14 ) is mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ) and is higher in power class than the first transmission filter ( 11 ,  12 ). The metal member ( 140 ) is disposed on a major surface ( 102 ) of the second transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side. The resin layer ( 15 ) is disposed on the first major surface ( 131 ) of the mounting substrate ( 130 ). The shield layer ( 16 ) covers at least part of the resin layer ( 15 ). The resin layer ( 15 ) covers at least part of an outer peripheral surface ( 103 ) of the first transmission filter ( 11 ,  12 ), covers at least part of the outer peripheral surface ( 103 ) of the second transmission filter ( 13 ,  14 ), and covers at least part of an outer peripheral surface ( 143 ) of the metal member ( 140 ). The shield layer ( 16 ) overlaps at least part of the metal member ( 140 ) in plan view in a thickness direction (D 1 ) of the mounting substrate ( 130 ). At least part of the major surface ( 141 ) of the metal member ( 140 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ). 
     According to this aspect, the major surface ( 102 ) of the second transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ) with the metal member ( 140 ) interposed therebetween, so it is possible to dissipate the heat generated in the second transmission filter ( 13 ,  14 ) through the metal member ( 140 ) and the shield layer ( 16 ), with the result that it is possible to improve the heat dissipation capability. 
     In a radio-frequency module ( 100 ;  100   d ) according to a third aspect, in the first or second aspect, the major surface ( 102 ) of the first transmission filters ( 11 ,  12 ) on an opposite side to the mounting substrate ( 130 ) side is spaced apart from the shield layer ( 16 ) in the thickness direction (D 1 ) of the mounting substrate ( 130 ). 
     According to this aspect, a printable area is increased, and an increase in the material cost is suppressed. 
     A radio-frequency module ( 100 ;  100   a ;  100   b ) according to a fourth aspect includes a mounting substrate ( 130 ), a transmission filter ( 13 ,  14 ), a resin layer ( 15 ), and a shield layer ( 16 ). The mounting substrate ( 130 ) has a first major surface ( 131 ) and a second major surface ( 132 ) opposite to each other. The transmission filter ( 13 ,  14 ) is at least one transmission filter of a power class 1 transmission filter and a power class 2 transmission filter, mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ). The resin layer ( 15 ) is disposed on the first major surface ( 131 ) of the mounting substrate ( 130 ). The shield layer ( 16 ) covers at least part of the resin layer ( 15 ). The resin layer ( 15 ) covers at least part of an outer peripheral surface ( 103 ) of the transmission filter ( 13 ,  14 ). The shield layer ( 16 ) overlaps at least part of the transmission filter ( 13 ,  14 ) in plan view in a thickness direction (D 1 ) of the mounting substrate ( 130 ). At least part of a major surface ( 102 ) of the transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ). 
     According to this aspect, at least part of the major surface ( 102 ) of the transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ), so it is possible to dissipate the heat generated in the transmission filter ( 13 ,  14 ) through the shield layer ( 16 ), with the result that it is possible to improve the heat dissipation capability. 
     A radio-frequency module ( 100   d ;  100   e ;  100   f ) according to a fifth aspect includes a mounting substrate ( 130 ), a transmission filter ( 13 ,  14 ), a metal member ( 140 ), a resin layer ( 15 ), and a shield layer ( 16 ). The mounting substrate ( 130 ) has a first major surface ( 131 ) and a second major surface ( 132 ) opposite to each other. The transmission filter ( 13 ,  14 ) is at least one transmission filter of a power class 1 transmission filter and a power class 2 transmission filter, mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ). The metal member ( 140 ) is disposed on a major surface ( 102 ) of the transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side. The resin layer ( 15 ) is disposed on the first major surface ( 131 ) of the mounting substrate ( 130 ). The shield layer ( 16 ) covers at least part of the resin layer ( 15 ). The resin layer ( 15 ) covers at least part of an outer peripheral surface ( 103 ) of the transmission filter ( 13 ,  14 ) and covers at least part of an outer peripheral surface ( 143 ) of the metal member ( 140 ). The shield layer ( 16 ) overlaps at least part of the metal member ( 140 ) in plan view in a thickness direction (D 1 ) of the mounting substrate ( 130 ). At least part of a major surface ( 141 ) of the metal member ( 140 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ). 
     According to this aspect, the major surface ( 102 ) of the transmission filter ( 13 ,  14 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ) with the metal member ( 140 ) interposed therebetween, so it is possible to dissipate the heat generated in the transmission filter ( 13 ,  14 ) through the metal member ( 140 ) and the shield layer ( 16 ), with the result that it is possible to improve the heat dissipation capability. 
     A radio-frequency module ( 100   a ;  100   f ) according to a sixth aspect, in the fourth or fifth aspect, further includes a power class 3 transmission filter ( 11 ,  12 ). The power class 3 transmission filter ( 11 ,  12 ) is a separate body from the transmission filter ( 13 ,  14 ) and is mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ). At least part of a major surface ( 102 ) of the power class 3 transmission filter ( 11 ,  12 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ). 
     According to this aspect, at least part of the major surface ( 102 ) of the power class 3 transmission filter ( 11 ,  12 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ), so it is possible to dissipate the heat generated in the power class 3 transmission filter ( 11 ,  12 ) through the shield layer ( 16 ), with the result that it is possible to further improve the heat dissipation capability. 
     A radio-frequency module ( 100   b ;  100   e ) according to a seventh aspect, in the fourth or fifth aspect, further includes a power class 3 transmission filter ( 11 ,  12 ) and a contact member ( 140 A). The power class 3 transmission filter ( 11 ,  12 ) is a separate body from the transmission filter ( 13 ,  14 ) and is mounted on the first major surface ( 131 ) of the mounting substrate ( 130 ). The contact member ( 140 A) is made of a metal material and is disposed on a major surface ( 102 ) of the power class 3 transmission filter ( 11 ,  12 ) on an opposite side to the mounting substrate ( 130 ) side. At least part of a major surface ( 141 ) of the contact member ( 140 A) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ). 
     According to this aspect, the major surface ( 102 ) of the power class 3 transmission filter ( 11 ,  12 ) on an opposite side to the mounting substrate ( 130 ) side is in contact with the shield layer ( 16 ) with the contact member ( 140 A) interposed therebetween, so it is possible to dissipate the heat generated in the power class 3 transmission filter ( 11 ,  12 ) through the contact member ( 140 A) and the shield layer ( 16 ), with the result that it is possible to improve the heat dissipation capability. 
     A communication device ( 300 ) according to an eighth aspect includes the radio-frequency module ( 100 ;  100   a  to  100   f ) according to any one of the first to seventh aspects, and a signal processing circuit ( 301 ). The signal processing circuit ( 301 ) is connected to the radio-frequency module ( 100 ;  100   a  to  100   f ). 
     According to this aspect, the communication device ( 300 ) includes the radio-frequency module ( 100 ;  100   a  to  100   f ), so it is possible to improve the heat dissipation capability.
           1  transmission filter     11 ,  12  transmission filter (first transmission filter, power class 3 transmission filter)     13 ,  14  transmission filter (second transmission filter, power class 2 transmission filter)     102  major surface     103  outer peripheral surface     2  receiving filter     21  to  26  receiving filter     3  power amplifier     31  driver stage amplifier     32 A final stage amplifier     32 B final stage amplifier     33  unbalance-balance conversion circuit (first balun)     331  unbalanced terminal     332 A balanced terminal     332 B balanced terminal     4  output matching circuit     41  balance-unbalance conversion circuit (second balun)     411 A balanced terminal     411 B balanced terminal     412  unbalanced terminal     42  circuit element     15  first resin layer (resin layer)     151  major surface     153  outer peripheral surface     16  shield layer     20  second resin layer     201  major surface     203  outer peripheral surface     5  first switch     50  common terminal     51  selection terminal     511  to  514  selection terminal     55  second IC chip     6  matching circuit (first matching circuit)     61  to  64  matching circuit     7  second switch     70  common terminal     70 A to  70 C selection terminal     71  selection terminal     711  to  716  selection terminal     8  matching circuit (second matching circuit)     9  external connection terminal     91 A,  91 B,  91 C antenna terminal     92  signal input terminal     93  signal output terminal     94  control terminal     95  ground terminal     17  input matching circuit     171  to  176  input matching circuit     18  low-noise amplifier     180  IC chip (first IC chip)     19  controller     100 ,  100   a ,  100   b ,  100   c ,  100   d ,  100   e ,  100   f  radio-frequency module     130  mounting substrate     131  first major surface     132  second major surface     133  outer peripheral surface     140  metal member     140 A contact member     141  major surface     142  major surface     143  outer peripheral surface     300  communication device     301  signal processing circuit     302  RF signal processing circuit     303  baseband signal processing circuit   A 1  antenna (first antenna)   A 2  antenna (second antenna)   A 3  antenna (third antenna)   C 1  capacitor   D 1  thickness direction   L 1  inductor element   L 2  inductor element   L 3  inductor element   L 4  inductor element   L 10  primary inductor   L 11  secondary inductor   La 1  inductor   La 2  inductor   Lc 1  inductor   Lc 2  inductor   T 1  first transformer   T 2  second transformer   Vcc 1  voltage   W 1  wire   W 2  wire