Patent Publication Number: US-2023145095-A1

Title: Antenna module, connection member, and communication device including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation of International Patent Application No. PCT/JP2021/018983, filed May 19, 2021, which claims priority to Japanese Application No. 2020-114822, filed Jul. 2, 2020, and Japanese Application No. 2020-173344, filed Oct. 14, 2020, the entire contents of each of which being incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an antenna module, a connection member, and a communication device including the same. More specifically, the present disclosure relates to a technique for increasing a degree of freedom in an arrangement of an antenna module in a communication device. 
     BACKGROUND ART 
     For a mobile communication apparatus represented by a mobile phone or a smartphone, an antenna module for transmitting and receiving a radio wave is used in many cases. For the mobile communication apparatus above, there is still a high demand for reduction in size and thickness, and accordingly, for a unit such as an antenna module included in a device, further reduction in size and lowering the profile are required. 
     Further, in recent years, with the enlargement of a display region (display) in a communication apparatus, a position where a radiating element (feed element) can be arranged in the communication apparatus is greatly limited in some cases. In the case above, a state may occur in which a close arrangement of a feed element and a motherboard provided with a circuit (integrated circuit (IC)) for processing a radio frequency signal becomes difficult, or restrictions may be imposed on an arrangement of a circuit on a motherboard. 
     Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2010-538542 (Patent Document 1) discloses a mobile wireless communication device including an antenna array connected to a wireless device arranged on a printed circuit board through a flexible interconnect. In the communication device described in Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2010-538542 (Patent Document 1), an antenna array can be mounted apart from a circuit board with a flexible interconnect having flexibility, and this makes it possible to increase a degree of freedom in an arrangement of a unit in a housing of a wireless apparatus. 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2010-538542 
       
    
     SUMMARY 
     Technical Problems 
     In Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2010-538542 (Patent Document 1), a wireless device includes individual RF front-ends corresponding to multiple antenna arrays. That is, RF front-ends of the same number as that of antenna arrays mounted on a wireless device are required. In the case above, under a condition the number of antenna arrays increases, the number of RF front-ends to be arranged on a circuit board also increases. Accordingly, a large mounting area is required on a circuit board, and as a result, it may be a factor that hinders the reduction in size of a wireless apparatus. 
     The present disclosure has been made to solve the problem described above, as well as other problems, and an object thereof is to reduce an antenna module in size. 
     Solutions to Problems 
     An antenna module according to an aspect of the present disclosure includes a first substrate and a first radiating element arranged on the first substrate, a second substrate and a second radiating element arranged on the second substrate, a third substrate having a feed circuit that supplies a radio frequency signal to the first substrate and the second substrate is arranged, and a switch circuit configured to controllably change over a connection between the feed circuit and the first radiating element and a connection between the feed circuit and the second radiating element. 
     A connection member according to another aspect of the present disclosure includes a dielectric substrate in which a feed wiring line that transfers a radio frequency signal between a feed circuit and each of a first radiating element and a second radiating element, the connection member interconnects a first substrate on which the first radiating element is arranged and a second substrate on which the second radiating element is arranged, and a switch circuit arranged on the dielectric substrate and configured to controllably change over a connection between the feed circuit and the first radiating element and a connection between the feed circuit and the second radiating element. 
     Advantageous Effects of Disclosure 
     With the use of the antenna module according to the present disclosure, the feed circuit common to two substrates (first substrate and second substrate), on each of which the radiating element is arranged, is provided on the third substrate. Then, a radio frequency signal from the feed circuit is changed over by the switch circuit and supplied to the radiating element of the first substrate or the radiating element of the second substrate. That is, since one feed circuit is shared by multiple antenna units (radiating element plus substrate), the number of feed circuits may be decreased with respect to the number of antenna units. Thus, an antenna module may be reduced in size. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a block diagram of a communication device to which an antenna module according to Embodiment 1 is applied. 
         FIG.  2    is a side view of the antenna module according to Embodiment 1. 
         FIG.  3    is a side view of an antenna module according to Modification 1. 
         FIG.  4    is a perspective view of the antenna module in  FIG.  3   . 
         FIG.  5    is a block diagram of a communication device to which an antenna module according to Embodiment 2 is applied. 
         FIG.  6    is a diagram illustrating a detail of a front-end module in  FIG.  5   . 
         FIG.  7    is a side view of the antenna module according to Embodiment 2. 
         FIG.  8    is a view illustrating an example of an internal structure of a connection member. 
         FIG.  9    is a side view of an antenna module according to Modification 2. 
         FIG.  10    is a side view of an antenna module according to Modification 3. 
         FIG.  11    is a side view of an antenna module according to Modification 4. 
         FIG.  12    is a plan view of an antenna module according to Modification 5. 
         FIG.  13    is a view illustrating an arrangement example of an antenna unit in a communication device. 
         FIG.  14    is a view illustrating a first modification of a connection terminal. 
         FIG.  15    is a view illustrating an example of a connection terminal in  FIG.  14   . 
         FIG.  16    is a view illustrating a second modification of a connection terminal. 
         FIG.  17    is a block diagram of a communication device to which an antenna module according to Embodiment 3 is applied. 
         FIG.  18    is a diagram illustrating a modification of a front-end module. 
         FIG.  19    is a side view of the antenna module according to Embodiment 3. 
         FIG.  20    is a partial sectional view of an antenna unit. 
         FIG.  21    is a view for explaining a configuration of a diplexer. 
         FIG.  22    is a view illustrating an arrangement example of a filter element in a motherboard. 
         FIG.  23    is a view illustrating an arrangement example of a filter element in an antenna unit. 
         FIG.  24    is a block diagram of a communication device to which an antenna module according to Modification 6 is applied. 
         FIG.  25    is a sectional view for explaining a connection state of a feed wiring line in an antenna unit. 
         FIG.  26    is a block diagram of a communication device to which an antenna module according to Embodiment 4 is applied. 
         FIG.  27    is a diagram for explaining a detail of a front-end module in  FIG.  26   . 
         FIG.  28    is a side view of the antenna module according to Embodiment 4. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the same or corresponding portions in the drawings are denoted by the same reference signs, and a description thereof will not be repeated. 
     Embodiment 1 
     (Basic Configuration of Communication Device) 
       FIG.  1    is an example of a block diagram of a communication device  10  to which an antenna module  100  according to Embodiment 1 is applied. The communication device  10  is a mobile terminal such as a mobile phone, a smartphone, or a tablet; a personal computer having a communication function; a base station; or the like, for example. Examples of a radio wave used in the antenna module  100  according to the present embodiment include a radio wave in a millimeter wave band whose center frequency is 28 GHz, 39 GHz, 60 GHz, or the like, for example. However, a radio wave in a frequency band other than the above may be adopted. 
     Referring to  FIG.  1   , the communication device  10  includes the antenna module  100  and a BBIC  200  constituting a baseband signal processing circuit. The antenna module  100  includes an RFIC  110  being an example of a feed circuit, antenna units  120 A and  120 B, and a switch circuit  130 . The communication device  10  up-converts a signal, which is transferred from the BBIC  200  to the antenna module  100 , into a radio frequency (RF) signal and radiates the radio frequency signal from the antenna unit  120 ; and down-converts a radio frequency signal received by the antenna unit  120  and processes the down-converted signal in the BBIC  200 . 
     In the example of  FIG.  1   , to facilitate the explanation, a case is illustrated in which each of the antenna units  120 A and  120 B (hereinafter also collectively referred to as “antenna unit  120 ”) includes four feed elements (also referred to herein as “radiating elements”. Moreover, the feed/radiating elements include structures that not only launch electrical current/voltage signals into a wireless propagation medium as electromagnetic waves, but also transduce electromagnetic waves that interact with radiating elements into current/voltage receive signals). Specifically, the antenna unit  120 A includes feed elements  121 A 1  to  121 A 4 , and the antenna unit  120 B includes feed elements  121 B 1  to  121 B 4 . 
     Note that, the feed elements  121 A 1  to  121 A 4  are also collectively referred to as “feed element  121 A”. Further, the feed elements  121 B 1  to  121 B 4  are also collectively referred to as “feed element  121 B”. Furthermore, the feed elements  121 A and  121 B are also collectively referred to as “feed element  121 ”. 
     In  FIG.  1   , the antenna unit  120  is a one-dimensional antenna array in which four feed elements  121  are arranged in a line. Note that the number of feed elements  121  is not necessarily plural, and the antenna unit  120  may be formed of one feed element  121 . Alternatively, the antenna unit  120  may be an array antenna in which the multiple feed elements  121  are arranged in two dimensions. In the present embodiment, each feed element  121  is a patch antenna having a substantially square, flat plate shape. 
     The RFIC  110  includes switches  111 A to  111 D,  113 A to  113 D, and  117 ; power amplifiers  112 AT to  112 DT; low-noise amplifiers  112 AR to  112 DR; attenuators  114 A to  114 D; phase shifters  115 A to  115 D; a signal combiner/divider  116 ; a mixer  118 ; and an amplifier  119 . 
     Under a condition a radio frequency signal is transmitted, the switches  111 A to  111 D and  113 A to  113 D are controlled to be changed over to connect to the power amplifiers  112 AT to  112 DT, and the switch  117  is connected to a transmission side amplifier of the amplifier  119 . Under a condition a radio frequency signal is received, the switches  111 A to  111 D and  113 A to  113 D are controlled to be changed over to connect to the low-noise amplifiers (LNAs)  112 AR to  112 DR, and the switch  117  is connected to a reception side amplifier of the amplifier  119 . 
     The switch circuit  130  includes switches  130 A to  130 D that are single-pole multiple throw switches. The switches  130 A to  130 D are respectively connected to the switches  111 A to  111 D in the RFIC  110 . The switch circuit  130  is controlled by the RFIC  110 , for example, and is configured to change over a connection between the RFIC  110  and the feed element  121 A of the antenna unit  120 A, and a connection between the RFIC  110  and the feed element  121 B of the antenna unit  120 B. 
     The switch  130 A includes a first terminal T 1 A, a second terminal T 2 A, and a third terminal T 3 A. The first terminal T 1 A is connected to a common terminal of the switch  111 A. The second terminal T 2 A is connected to the feed element  121 A 1  of the antenna unit  120 A. The third terminal T 3 A is connected to the feed element  121 B 1  of the antenna unit  120 B. 
     Similarly, with respect to the switch  130 B, a first terminal T 1 B is connected to a common terminal of the switch  111 B, a second terminal T 2 B is connected to the feed element  121 A 2  of the antenna unit  120 A, and a third terminal T 3 B is connected to the feed element  121 B 2  of the antenna unit  120 B. With respect to the switch  130 C, a first terminal T 1 C is connected to a common terminal of the switch  111 C, a second terminal T 2 C is connected to the feed element  121 A 3  of the antenna unit  120 A, and a third terminal T 3 C is connected to the feed element  121 B 3  of the antenna unit  120 B. With respect to the switch  130 D, a first terminal T 1 D is connected to a common terminal of the switch  111 D, a second terminal T 2 D is connected to the feed element  121 A 4  of the antenna unit  120 A, and a third terminal T 3 D is connected to the feed element  121 B 4  of the antenna unit  120 B. 
     Under a condition a radio frequency signal is transmitted and received with the antenna unit  120 A, the switches  130 A to  130 D are respectively changed over to the second terminals T 2 A to T 2 D. The term “changed over” is to be understood as a circuitry controlled operation that uses dedicated circuitry, or programmable circuitry. Under a condition a radio frequency signal is transmitted and received with the antenna unit  120 B, the switches  130 A to  130 D are respectively changed over to the third terminals T 3 A to T 3 D. 
     A signal transferred from the BBIC  200  is amplified by the amplifier  119  and up-converted by the mixer  118 . A transmission signal, which is an up-converted radio frequency signal, is divided into four signals by the signal combiner/divider  116 , then the four signals pass through four signal paths, and are fed to the feed elements  121  different from each other. At this time, the directivity of the antenna unit  120  may be adjusted by individually adjusting a phase shift degree in each of the phase shifters  115 A to  115 D arranged in the respective signal paths. 
     Reception signals, which are radio frequency signals received by the feed elements  121 , pass through four different signal paths, and are combined by the signal combiner/divider  116 . The combined reception signal is down-converted by the mixer  118 , amplified by the amplifier  119 , and transferred to the BBIC  200 . 
     (Configuration of Antenna Module) 
       FIG.  2    is a side view of the antenna module  100  according to Embodiment 1. The antenna module  100  includes the RFIC  110 , the antenna unit  120 A in which the feed element  121 A is formed on a dielectric substrate  122 A, the antenna unit  120 B in which the feed element  121 B is formed on a dielectric substrate  122 B, and the switch circuit  130 . The dielectric substrate  122 A and the dielectric substrate  122 B are also collectively referred to as “dielectric substrate  122 ”. 
     The RFIC  110  and the switch circuit  130  are arranged on a motherboard  250 . The RFIC  110  is electrically connected to the BBIC  200  also arranged on the motherboard  250  by a connection wiring line  260 . Further, the RFIC  110  is connected to the switch circuit  130  by a connection wiring line  170 . Note that, in  FIG.  2    and the following description, a normal direction of the motherboard  250  is defined as a Z-axis direction, and directions (in-plane directions of motherboard  250 ) orthogonal to the Z-axis direction are defined as an X-axis direction and a Y-axis direction. 
     The antenna unit  120 A is connected to the motherboard  250  with a connection terminal  150 A. The antenna unit  120 B is connected to the motherboard  250  with a connection terminal  150 B. The connection terminals  150 A and  150 B are connectors configured to be detachable, for example. Note that, the connection terminals  150 A and  150 B may be formed by solder bumps. 
     In the antenna unit  120 , the dielectric substrate  122  on which the feed element  121  is formed is, for example, a low temperature co-fired ceramic (LTCC) multilayer substrate, a multilayer resin substrate formed by laminating multiple resin layers formed of resin such as epoxy or polyimide, a multilayer resin substrate formed by laminating multiple resin layers formed of liquid crystal polymer (LCP) having a lower dielectric constant, a multilayer resin substrate formed by laminating multiple resin layers formed of fluororesin, or a ceramic multilayer substrate other than LTCC. Note that the dielectric substrate  122  does not necessarily have a multilayer structure, and may be a single-layer substrate. 
     The feed element  121  has a flat plate shape and is formed of a conductor such as copper or aluminum. The shape of the feed element  121  is not limited to a rectangle as illustrated in  FIG.  1   , and may be a polygon, a circle, an ellipse, or a cross. The feed element  121  is formed on a surface of the dielectric substrate  122  or in an internal layer thereof. In the example of  FIG.  2   , an array antenna is illustrated in which four feed elements  121  are arranged in one direction, but the feed element  121  may be formed alone, or the array antenna may have a configuration in which multiple feed elements  121  are arranged in one dimension or two dimensions. Note that, although not illustrated in  FIG.  2   , a ground electrode is arranged in the dielectric substrate  122  to face the feed element  121 . 
     The switch circuit  130  is connected to the antenna unit  120 A with a feed wiring line  160 A via the connection terminal  150 A. Further, the switch circuit  130  is connected to the antenna unit  120 B with a feed wiring line  160 B via the connection terminal  150 B. A radio frequency signal from the RFIC  110  is changed over by the switch circuit  130  to be supplied to the feed element  121 A of the antenna unit  120 A, or the feed element  121 B of the antenna unit  120 B. Under a condition a radio frequency signal is supplied to the antenna unit  120 A, a radio wave is radiated from the feed element  121 A, and no radio wave is radiated from the feed element  121 B. To the contrary, under a condition a radio frequency signal is supplied to the antenna unit  120 B, a radio wave is radiated from the feed element  121 B, and no radio wave is radiated from the feed element  121 A. 
     Under a condition multiple antenna units are provided in an antenna module, an RFIC is individually arranged for each antenna unit in many cases. In the case above, a substrate (motherboard, for example) on which the RFICs are arranged requires a mounting area for arranging all the RFICs. In a communication device such as a mobile terminal, in order to ensure connection with a base station, a configuration is being adopted in which multiple antenna units are provided and radio waves can be radiated in and received from different directions. In contrast, an increase in a substrate area due to an increase in the number of antenna units may become a factor that hinders the reduction in size of an antenna module and a wireless apparatus. 
     However, as in Embodiment 1, the number of RFICs may be decreased with respect to the number of antenna units by adopting a configuration in which an RFIC is made common to the multiple antenna units and the antenna units are used by being changed over by a switch circuit. This may relieve a constraint to reduce a size of a wireless apparatus. Further, since an RFIC is a component that is relatively more expensive than other components, decreasing the number of RFICs may contribute to cost reduction. 
     Note that, in the description above, an example has been described in which two antenna units are connected to one RFIC via a switch circuit. However, three or more antenna units may be connected to an RFIC. 
     “Dielectric substrate  122 A”, “dielectric substrate  122 B”, and “motherboard  250 ” in Embodiment 1 respectively correspond to “first substrate”, “second substrate”, and “third substrate” in the present disclosure. 
     (Modification 1) 
     In Embodiment 1, a configuration has been described in which the antenna unit  120 A and the antenna unit  120 B are individually connected to the motherboard  250 . In Modification 1, a configuration will be described in which the antenna unit  120 A and the antenna unit  120 B are connected to each other.  FIG.  3    is a side view of an antenna module  100 X according to Modification 1.  FIG.  4    is a perspective view of the antenna module  100 X. Note that, in the description of  FIG.  3    and  FIG.  4   , the description of elements overlapping those of the antenna module  100  of Embodiment 1 will not be repeated. 
     Referring to  FIG.  3    and  FIG.  4   , in the antenna module  100 X, the antenna unit  120 A is connected to the motherboard  250  with the connection terminal  150 A in the similar manner as in the antenna module  100  of Embodiment 1. However, the antenna unit  120 B is connected to the antenna unit  120 A with a bent connection member  123 . 
     The antenna units  120 A and  120 B and the connection member  123  have a substantially L-shape in plan view in the Y-axis direction as illustrated in  FIG.  3   . A radio wave is radiated in the Z-axis direction from the feed element  121 A of the antenna unit  120 A. Further, a radio wave is radiated in the X-axis direction from the feed element  121 B of the antenna unit  120 B. 
     In the antenna module  100 X, the antenna units  120 A and  120 B extend in the Y-axis direction as illustrated in  FIG.  4   . The feed elements  121 A of the antenna unit  120 A are arranged in the Y-axis direction on the dielectric substrate  122 A. Further, the feed elements  121 B of the antenna unit  120 B are arranged in the Y-axis direction on the dielectric substrate  122 B. 
     The feed wiring line  160 B extends from the connection terminal  150 A to the dielectric substrate  122 B through the dielectric substrate  122 A and the connection member  123 , and transfers a radio frequency signal to (or from) the feed elements  121 B on the dielectric substrate  122 B. 
     Note that, in the antenna units  120 A and  120 B of the antenna module  100 X of Modification 1, feed elements are arranged such that a polarization direction of the radio wave radiated from each of the feed elements is inclined by θ relative to the arrangement direction (that is, Y-axis direction) of the feed elements. The magnitude of θ is greater than 0° and less than 90°, and θ equals 45° in one example. Even in a case where a dimension of a dielectric substrate in the polarization direction is limited, by arranging a feed element to be inclined as described above, a distance from the feed element to an end portion of the dielectric substrate (ground electrode) is increased, and deterioration of a frequency band width may be suppressed. 
     Further, even in a configuration in which the antenna unit  120 A and the antenna unit  120 B are connected to each other by the connection member  123  as in the antenna module  100 X of Modification 1, by adopting a configuration in which the RFIC  110  is made common to multiple antenna units and the antenna units are used by being changed over by the switch circuit  130 , a factor that hinders the reduction in size of a wireless apparatus may be reduced. 
     Note that, a configuration is illustrated in  FIG.  3    in which the dielectric substrate  122 A of the antenna unit  120 A and the dielectric substrate  122 B of the antenna unit  120 B are formed as individual substrates and are connected with the connection member  123 . However, the dielectric substrates  122 A and  122 B and the connection member  123  may integrally be formed as a single substrate, and the single substrate may be configured to be bent at a portion of the connection member  123 . 
     Embodiment 2 
     In Embodiment 1, a configuration example has been described in which multiple antenna units are directly connected to a motherboard. 
     However, in recent years, with the enlargement of a display region (display) in a communication apparatus, as recognized by the present inventors, a location at which an antenna unit can be arranged in the communication apparatus is greatly limited in some cases, and there is a possibility that the antenna unit cannot be arranged close to a motherboard. 
     Then, in Embodiment 2, a configuration is adopted in which a connection member is arranged between a motherboard and an antenna unit to extend a signal transfer path from the motherboard to the antenna unit, thereby increasing a degree of freedom in a layout of the antenna unit in a communication device. Further, in Embodiment 2, amplifiers are further arranged on a connection member to suppress a decrease in loss due to signal attenuation accompanying the extension of a signal transfer path. 
     (Basic Configuration of Communication Device) 
       FIG.  5    is a block diagram of a communication device  10 A to which an antenna module  100 A according to Embodiment 2 is applied. The antenna module  100 A has a configuration in which front-end modules (hereinafter also referred to as “FEMs”)  180 A and  180 B are added to the antenna module  100  of Embodiment 1 illustrated in  FIG.  1   . In the antenna module  100 A of  FIG.  5   , the description of elements overlapping those of the antenna module  100  in  FIG.  1    will not be repeated. 
     Referring to  FIG.  5   , in the antenna module  100 A, the FEM  180 A is arranged on a signal transfer path between the switch circuit  130  and the antenna unit  120 A, and the FEM  180 B is arranged on a signal transfer path between the switch circuit  130  and the antenna unit  120 B. 
     The FEM  180 A includes an FEM  180 A 1  to an FEM  180 A 4 . The FEM  180 A 1  is connected between the second terminal T 2 A of the switch  130 A and the feed element  121 A 1 . The FEM  180 A 2  is connected between the second terminal T 2 B of the switch  130 B and the feed element  121 A 2 . The FEM  180 A 3  is connected between the second terminal T 2 C of the switch  130 C and the feed element  121 A 3 . The FEM  180 A 4  is connected between the second terminal T 2 D of the switch  130 D and the feed element  121 A 4 . 
     The FEM  180 B includes an FEM  180 B 1  to an FEM  180 B 4 . The FEM  180 B 1  is connected between the third terminal T 3 A of the switch  130 A and the feed element  121 B 1 . The FEM  180 B 2  is connected between the third terminal T 3 B of the switch  130 B and the feed element  121 B 2 . The FEM  180 B 3  is connected between the third terminal T 3 C of the switch  130 C and the feed element  121 B 3 . The FEM  180 B 4  is connected between the third terminal T 3 D of the switch  130 D and the feed element  121 B 4 . Note that, in the following description, the FEMs  180 A and  180 B (and FEMs included therein) are also collectively referred to as “FEM  180 ”. 
     The FEM  180  includes switches  181  and  182 , a power amplifier  183 , and a low-noise amplifier  184  as illustrated in  FIG.  6   . In the FEM  180 , the switches  181  and  182  are changed over to the power amplifier  183  when transmitting a radio frequency signal, and the switches  181  and  182  are changed over to the low-noise amplifier  184  when receiving a radio frequency signal, the same as the switches  111 A to  111 D and  113 A to  113 D, the power amplifiers  112 AT to  112 DT, and the low-noise amplifiers  112 AR to  112 DR provided inside the RFIC  110 . 
     The FEM  180  is an amplifier that amplifies a radio frequency signal transferred between the RFIC  110  and the antenna unit  120  to compensate for attenuation occurring between the RFIC  110  and the antenna unit  120 . In particular, it is effective under a condition the length of a signal transfer path from the RFIC  110  to each antenna unit is relatively long and an amplification factor is insufficient in a power amplifier and a low-noise amplifier in the RFIC  110 . Note that, a case has been described in  FIG.  6    in which the FEM  180  includes both the power amplifier  183  and the low-noise amplifier  184 . However, it is sufficient that the FEM  180  includes at least one of the power amplifier  183  and the low-noise amplifier  184 , and the FEM  180  may have a configuration in which either the power amplifier  183  or the low-noise amplifier  184  is included. 
     Note that “FEM  180 A” and “FEM  180 B” respectively correspond to “first amplifier” and “second amplifier” in the present disclosure. 
     (Configuration of Antenna Module)  FIG.  7    is a side view of the antenna module  100 A according to Embodiment 2. The antenna module  100 A includes, similarly to as in Embodiment 1, the RFIC  110  and the switch circuit  130  that are arranged on the motherboard  250 , and the antenna units  120 A and  120 B. The antenna module  100 A further includes a connection member  140  and the FEMs  180 A and  180 B. Note that, in the antenna module  100 A, the description of elements overlapping those of the antenna module  100  will not be repeated. 
     Referring to  FIG.  7   , the connection member  140  is a member for transferring a radio frequency signal from the RFIC  110  arranged on the motherboard  250  to the antenna units  120 A and  120 B, and has multiple feed wiring lines formed therein as will be described later in  FIG.  8   . The connection member  140  is used as a signal transfer path under a condition the antenna units  120 A and  120 B are arranged at positions apart from the motherboard  250  in the communication device  10 . 
     The connection member  140  has a dielectric substrate  143  ( FIG.  8   ) formed of a ceramic such as LTCC or a resin, the same as the dielectric substrate  122  forming an antenna unit. The dielectric substrate  143  has a multilayer structure in which multiple dielectric layers are laminated. The connection member  140  may be formed of a rigid material that does not deform, or may be formed of a flexible material as will be described later in  FIG.  11    and  FIG.  12   . 
     The connection member  140  is connected to the antenna units  120 A and  120 B with connection terminals  150 A and  150 B, respectively, on a front surface  141  of the connection member  140 . Further, the connection member  140  is connected to the motherboard  250  with a connection terminal  155  on a back surface  142  of the connection member  140 . Each of the connection terminals  150 A,  150 B, and  155  is formed of a connector configured to be detachable or a solder bump. 
     The FEM  180 A is arranged at a position of the connection member  140  between a point connected to the dielectric substrate  122 A of the antenna unit  120 A (that is, connection terminal  150 A), and a point connected to the motherboard  250  (that is, connection terminal  155 ). Further, the FEM  180 B is arranged at a position of the connection member  140  between a point connected to the dielectric substrate  122 B of the antenna unit  120 B (that is, connection terminal  150 B), and a point connected to the motherboard  250  (that is, connection terminal  155 ). 
     In the example of  FIG.  7   , the FEM  180  is arranged on the back surface  142  of the connection member  140 . As described in  FIG.  6   , since the FEM  180  is an amplifier including the power amplifier  183  and/or the low-noise amplifier  184 , heat may be generated during signal amplification. The antenna unit  120  is accommodated in a housing  50  of the communication device  10 A, and as illustrated in  FIG.  7   , the antenna unit  120  is arranged on a side of the front surface  141  of the connection member  140  to face the housing  50 . Accordingly, in a case where the FEM  180  is arranged on the side of the front surface  141  of the connection member  140 , the FEM  180  and the housing  50  are positioned close to each other, and the temperature of the housing  50  may partially increase due to the heat from the FEM  180 . Arranging the FEM  180  on the back surface  142  of the connection member  140  and ensuring a separation distance between the FEM  180  and the housing  50  may suppress the heat transfer to the housing  50 . 
     Note that, the FEM  180  may be arranged such that at least a portion thereof is in contact with the motherboard  250  as with the FEM  180 B in  FIG.  7   . With the configuration above, the heat generated in the FEM  180  may directly be transferred to the motherboard  250 , and heat dissipation efficiency may further be increased. Further, a housing of the FEM  180  may be in direct contact with the motherboard  250 , or the FEM  180  and the motherboard  250  may be made to be in contact with each other by arranging a highly heat-conductive member (that is, metallic member such as copper) therebetween. 
     Note that, under a condition a sufficient distance may be ensured between the FEM  180  and the housing  50 , or under a condition a heat insulation member or a heat shielding member such as another unit is provided between the FEM  180  and the housing  50 , the FEM  180  may be arranged on the front surface  141  of the connection member  140 . The housing  50  may be made of a material that is transparent or substantially transparent to RF energy so radio waves pass through the housing  50  when launched from, or received by, the feed elements  121 . 
     The FEM  180  may directly be connected to the connection member  140  by using a solder bump, a connector, or the like, or may be connected via an intermediate substrate such as an interposer. Further, in order to lower the profile, a portion of the connection member  140  where the FEM  180  is arranged may be made thinner than other portions. 
     A radio frequency signal from the RFIC  110  is supplied to the antenna unit  120 A through the feed wiring line  160 A via the switch circuit  130 . Further, a radio frequency signal from the RFIC  110  is supplied to the antenna unit  120 B through the feed wiring line  160 B via the switch circuit  130 . 
       FIG.  8    is a view illustrating an example of an internal structure of the connection member  140 . In  FIG.  8   , two signal transfer paths for the antenna unit  120 A will be described to facilitate the explanation. In the example of  FIG.  8   , the FEM  180 A 1  is arranged on the front surface  141  of the connection member  140 , and the FEM  180 A 2  is arranged on the back surface  142  of the connection member  140 . In the connection member  140 , feed wiring lines  161  and  162  and a ground electrode GND are formed. The feed wiring line  161  transfers a radio frequency signal to the feed element  121 A of the antenna unit  120 A via the FEM  180 A 1 . Further, the feed wiring line  162  transfers a radio frequency signal to another feed element  121 A via the FEM  180 A 2 . 
     Note that, a configuration has been described in  FIG.  8    in which FEMs and feed wiring lines corresponding to different radiating elements in the same antenna unit are separately arranged on front and back surfaces of a connection member. However, FEMs and feed wiring lines corresponding to different antenna units may separately be arranged on front and back surfaces of a connection member. For example, an FEM and a feed wiring line corresponding to a first antenna unit may be arranged on a front surface of a connection member, and an FEM and a feed wiring line corresponding to a second antenna unit may be arranged on back surfaces of the connection member. Further, an FEM and a feed wiring line corresponding to some of the radiating elements of a first antenna unit and a second antenna unit may be arranged on a front surface of a connection member, and an FEM and a feed wiring line corresponding to the remaining radiating elements may be arranged on a back surface of the connection member. 
     The feed wiring line  161  and the feed wiring line  162  are formed in different layers in the dielectric substrate  143 . The ground electrode GND is formed between a layer in which the feed wiring line  161  is formed and a layer in which the feed wiring line  162  is formed, and is connected to a reference electric potential (not illustrated) formed on the motherboard  250  via the connection terminal  155 . Further, the ground electrode GND is connected to a ground electrode (not illustrated) formed in the dielectric substrate  122 A of the antenna unit  120 A via the connection terminal  150 A. 
     Note that “feed wiring line  161 ” and “feed wiring line  162 ” respectively correspond to “first wiring line” and “second wiring line” of the present disclosure. 
     As described above, when a radio frequency signal is supplied to the antenna unit  120  through multiple feed wiring lines, by forming the feed wiring lines in different layers in the connection member  140 , the area of the connection member  140  in a main surface direction (XY plane) may be reduced in comparison with a case where all the feed wiring lines are formed in the same layer. Further, by arranging feed wiring lines to sandwich a ground electrode, the isolation between the feed wiring lines may be ensured. 
     Note that, although not illustrated in  FIG.  8   , the same configuration may be adopted for a signal transfer path to the antenna unit  120 B. Further, in  FIG.  8   , the configuration has been described in which feed wiring lines are formed in two different layers, but the feed wiring lines may be formed in three or more different layers. Also, in the case above, it is an option to arrange a ground electrode between dielectric layers in which feed wiring lines are formed. 
     As described above, by arranging a connection member between a motherboard and an antenna unit and extending a signal transfer path from the motherboard to the antenna unit, it becomes possible to increase a degree of freedom in a layout of an antenna unit in a communication device. Further, by arranging an amplifier on a connection member, a decrease in loss due to signal attenuation accompanying the extension of a signal transfer path may be suppressed. 
     (Modification 2) 
     In the antenna module  100 A of Embodiment 2 in  FIG.  7   , a configuration has been described in which a switch circuit is arranged on a motherboard. In Modification 2, a configuration will be described in which a switch circuit is arranged on a connection member. 
       FIG.  9    is a side view of an antenna module  100 B according to Modification 2. The antenna module  100 B has a configuration in which the position of the switch circuit in the antenna module  100 A illustrated in  FIG.  7    is changed to a position on the connection member  140 . In the antenna module  100 B, the description of elements overlapping those of the antenna module  100 A will not be repeated. 
     Referring to  FIG.  9   , also in the antenna module  100 B, the connection member  140  is connected to the motherboard  250  via the connection terminal  155 . The antenna units  120 A and  120 B are respectively connected to the connection member  140  via the connection terminals  150 A and  150 B. 
     A switch circuit  130 X is arranged on the front surface  141  of the connection member  140 , and is connected to the RFIC  110  with a connection wiring line  171  via the connection terminal  155 . Note that, although not illustrated in  FIG.  9   , the switch circuit  130 X feeds a radio frequency signal from the RFIC  110  to the antenna unit  120  via the FEM  180  through a feed wiring line formed inside the connection member  140 . Further, the switch circuit  130 X may also be arranged on the back surface  142  of the connection member  140 . 
     As described above, by arranging a switch circuit on a connection member, the number of components arranged on a motherboard decreases, and the motherboard may be reduced in size. In particular, in a case where a large number of antenna units are arranged in a communication device, the number of switch circuits also increases, and this makes the effect of reduction in size remarkable. 
     (Modification 3) 
     In the antenna module  100 A of Embodiment 2 in  FIG.  7   , a configuration has been described in which multiple antenna units are connected to a common connection member. However, in a case where two antenna units are arranged far apart from each other, for example, under a condition a common connection member is used, the length of the connection member becomes long. This may make it difficult to mount the antenna units on a communication device. 
     Then, in Modification 3, a configuration will be described in which connection members, to connect to a motherboard, are individually provided to multiple antenna units to which a radio frequency signal is supplied from a common switch circuit. 
       FIG.  10    is a side view of an antenna module  100 C according to Modification 3. In the antenna module  100 C, connection members  140 A and  140 B are used instead of the connection member  140  in the antenna module  100 A illustrated in  FIG.  7   . Note that, in the antenna module  100 C, the description of elements overlapping those of the antenna module  100 A will not be repeated. 
     Referring to  FIG.  10   , the connection member  140 A is connected to the motherboard  250  with a connection terminal  155 A, and is connected to the antenna unit  120 A with the connection terminal  150 A. The FEM  180 A is arranged on the connection member  140 A. A radio frequency signal from the switch circuit  130  arranged on the motherboard  250  is supplied to the feed element  121 A of the antenna unit  120 A through the feed wiring line  160 A via the connection member  140 A. 
     Similarly, the connection member  140 B is connected to the motherboard  250  with a connection terminal  155 B, and is connected to the antenna unit  120 B with the connection terminal  150 B. The FEM  180 B is arranged on the connection member  140 B. A radio frequency signal from the switch circuit  130  arranged on the motherboard  250  is supplied to the feed element  121 B of the antenna unit  120 B through the feed wiring line  160 B via the connection member  140 B. 
     Note that, although the FEM  180 A is arranged on a back surface  142 A of the connection member  140 A in  FIG.  10   , the FEM  180 A may be arranged on a front surface  141 A of the connection member  140 A. Further, the FEM  180 B may also be arranged on a front surface  141 B of the connection member  140 B instead of a back surface  142 B of the connection member  140 B. 
     Note that “connection member  140 A” and “connection member  140 B” respectively correspond to “first connection member” and “second connection member” in the present disclosure. Further, “FEM  180 A” and “FEM  180 B” respectively correspond to “first amplifier” and “second amplifier” in the present disclosure. 
     As described above, by individually providing connection members to multiple antenna units, the total size of the connection members may be reduced in comparison with a case where a common connection member is used. This makes it easy to mount an antenna unit on a communication device. 
     (Modification 4) 
     In Modification 4 and Modification 5 that is to be described later, a case will be described in which a flexible connection member is used. 
       FIG.  11    is a side view of an antenna module  100 D according to Modification 4. In the antenna module  100 D, the connection member  140  of the antenna module  100 A illustrated in  FIG.  7    is replaced with a connection member  140 C. Note that, in the antenna module  100 D, the description of elements overlapping those of the antenna module  100 A will not be repeated. 
     Referring to  FIG.  11   , the connection member  140 C is a flexible substrate formed of a material having flexibility, and is configured to be bendable in a thickness direction. In the example of  FIG.  11   , the connection member  140 C has a configuration in which a second portion  146  branches off from a first portion  145 . The second portion  146  is bent after branching off from the first portion  145 , and extends in a direction opposite to the first portion  145 . 
     The first portion  145  of the connection member  140 C is connected to the motherboard  250  with the connection terminal  155 . The antenna unit  120 A is connected to the first portion  145  of the connection member  140 C with the connection terminal  150 A. Further, the antenna unit  120 B is connected to the second portion  146  of the connection member  140 C with the connection terminal  150 B. The FEM  180 A and the FEM  180 B are respectively arranged in the first portion  145  and the second portion  146 . 
     Further, in the connection member  140 C, the switch circuit  130 X is arranged at a position closer to the connection terminal  155  than to the branch of the second portion  146 . As in the antenna module  100 B illustrated in  FIG.  9   , the switch circuit  130 X is connected to the RFIC  110  arranged on the motherboard  250  with the connection wiring line  171 . A radio frequency signal from the RFIC  110  is supplied to the antenna unit  120 A or the antenna unit  120 B by the switch circuit  130 X. 
     Note that, in  FIG.  11   , a configuration has been described in which a connection member shared by multiple antenna units is formed of a flexible material and the connection member is partially branched and bent. However, the connection member does not necessarily have a configuration being branched in the middle. Further, in a configuration in which individual connection members are provided to antenna units as illustrated in Modification 3 of  FIG.  10   , some or all of the connection members may be formed of a material having flexibility. 
     As described above, by connecting an antenna unit and a motherboard by using a flexible connection member, it becomes possible to increase a degree of freedom in a layout of an antenna unit in a housing of a communication device. Further, by arranging an FEM on a connection member, deterioration of antenna characteristics due to extension of a signal transfer path may be suppressed. 
     (Modification 5) 
     In Modification 4 of  FIG.  11   , a configuration example has been described in which a connection member is bent and branched in the thickness direction. In Modification 5, a configuration will be described in which a connection member is bent and branched in an in-plane direction of the main surface. 
       FIG.  12    is a plan view of an antenna module  100 E according to Modification 5. In the antenna module  100 E, the connection member  140  of the antenna module  100 A illustrated in  FIG.  7    is replaced with a connection member  140 D. Note that, in the antenna module  100 E, the description of elements overlapping those of the antenna module  100 A will not be repeated. 
     Referring to  FIG.  12   , the connection member  140 D is a flexible substrate formed of a material having flexibility, and is configured to be bendable in an in-plane direction (that is, in XY plane) of the main surface of the connection member  140 D. The connection member  140 D includes a first portion  145 A and a second portion  146 A. In  FIG.  12   , the first portion  145 A extends in the X-axis direction from a portion connected to the motherboard  250 , and is connected to the antenna unit  120 A. The second portion  146 A is bent and branches off from the first portion  145 A in the Y-axis direction, is further bent again in the X-axis direction, and is connected to the antenna unit  120 B. Note that each of the first portion  145 A and the second portion  146 A of the connection member  140 D may be configured to be bendable also in the thickness direction similarly to as in Modification 4. Further, the connection member  140 D may be configured to be bendable in a twisting direction around an axis in an extending direction. An FEM  180  is arranged on the front and/or back surface of the connection member  140 D. 
     As described above, by connecting an antenna unit and a motherboard using a flexible connection member, it becomes possible to increase a degree of freedom in a layout of an antenna unit in a housing of a communication device. Further, by arranging an FEM on a connection member, deterioration of antenna characteristics due to extension of a signal transfer path may be suppressed. 
     [Arrangement Example of Antenna Unit] 
     In  FIG.  13   , an arrangement example of an antenna unit in a communication device, in a case where the antenna module illustrated in each of the embodiments described above is applied, will be described. 
     The housing  50  of the communication device  10  has a substantially rectangular parallelepiped shape, and has main surfaces  51  and  52  whose normal direction is the Z-axis direction, side surfaces  55  and  56  whose normal direction is the X-axis direction, and side surfaces  57  and  58  whose normal direction is the Y-axis direction. 
     In a first example of  FIG.  13 ( a ) , the antenna unit  120 A is arranged on the side surface  55 , and the antenna unit  120 B is arranged on the side surface  57 . In the first example, radio waves may be radiated in a negative direction of the X-axis and a positive direction of the Y-axis. 
     In a second example of  FIG.  13 ( b ) , the antenna unit  120 A is arranged on the main surface  51 , and the antenna unit  120 B is arranged on the side surface  57 . In the second example, radio waves may be radiated in the positive direction of the Y-axis and a positive direction of the Z-axis. 
     In a third example of  FIG.  13 ( c ) , the antenna unit  120 A is arranged on the side surface  55 , and the antenna unit  120 B is arranged on the side surface  56 . In the third example, radio waves may be radiated in the positive and negative directions of the X-axis. 
     In a fourth example of  FIG.  13 ( d ) , the antenna unit  120 A is arranged on the side surface  55 , the antenna unit  120 B is arranged on the side surface  57 , and an antenna unit  120 C is arranged on the main surface  51 . In the fourth example, radio waves may be radiated in three directions including the negative direction of the X-axis, the positive direction of the Y-axis, and the positive direction of the Z-axis. 
     Note that the arrangement illustrated in  FIG.  13    is an example, and the surfaces on which the antenna units are arranged may be a combination other than that in  FIG.  13   . For example, multiple antenna units may be arranged on the same side surface while being apart from each other. In each arrangement example of  FIG.  13   , the antenna unit is arranged at an end portion, but the antenna unit may be arranged near the center of each surface. Further, the number of antenna units arranged in the communication device may be four or more. 
     Under a condition radio waves are radiated from a communication device in all directions of the X-axis, the Y-axis, and the Z-axis, at least six antenna units are required. In the case above, under a condition an RFIC is arranged for each antenna unit, a space for arranging six RFICs is required on a motherboard. The number of RFICs to be arranged on a motherboard may be decreased by sharing an RFIC between multiple antenna units by using a switch circuit as in the present embodiment described above. This makes it possible to reduce a motherboard and a communication device in size. 
     &lt;Modification of Connection Terminal&gt; 
     In the embodiment described above, an example as follows has been described. The connection terminals  150 A and  150 B, used for connecting the connection member or the motherboard to the antenna unit, and the connection terminals  155 ,  155 A, and  155 B, used for connecting the motherboard and the connection member, are formed between the mutually facing surfaces of the members to be connected. However, these connection terminals may have another connection mode. 
     For example, a connection mode is described as follows using the connection between the motherboard  250  and the antenna unit  120 A in  FIG.  2    as an example. An antenna module may be configured such that an end portion of the motherboard  250  and an end portion of the antenna unit  120 A are arranged to face each other, and the front surfaces (or back surfaces) of the motherboard  250  and the antenna unit  120 A are connected by a connection terminal  150 X as illustrated in  FIG.  14   . Note that the connection terminal  150 X may be a combination of multiple connectors  150 X 1  and  150 X 2  each having a conductive pin and/or a socket as illustrated in  FIG.  15   . 
     Further, an antenna module may be configured such that a terminal portion is formed at an end portion of the antenna unit  120 A, and the antenna unit  120 A is fitted and connected to a connection terminal  150 Y mounted on a front surface of the motherboard  250  as illustrated in  FIG.  16   . 
     Note that the connection modes of  FIG.  14    to  FIG.  16    may also be applied to the connection between the antenna unit  120 B and the motherboard  250 . Further, the connection mode may also be applied to a connection between an antenna unit and a connection member and a connection between a motherboard and a connection member. 
     Embodiment 3 
     (Configuration of Communication Device) 
     In Embodiment 3, an example of a case of a so-called dual-band type antenna module, capable of radiating radio waves in two different frequency bands from an antenna unit, will be described. 
       FIG.  17    is a block diagram of a communication device  10 F to which an antenna module  100 F according to Embodiment 3 is applied. Referring to  FIG.  17   , the communication device  10 F includes the antenna module  100 F and the BBIC  200 . The antenna module  100 F includes an RFIC  110 F, antenna units  120 F and  120 G, the switch circuit  130 , the FEMs  180 A and  180 B, and filter elements  190 ,  195 A and  195 B. 
     The antenna units  120 F and  120 G are dual-band type antenna units as described above, and each of the radiating elements arranged in each of the antenna units  120 F and  120 G includes two feed elements. The antenna unit  120 F includes feed elements  121 F and  125 F, and the antenna unit  120 G includes feed elements  121 G and  125 G. A radio frequency signal is individually supplied to each feed element from the RFIC  110 F. Note that “feed element  121 F” and “feed element  121 G” in Embodiment 3 correspond to “first element” in the present disclosure. Further, “feed element  125 F” and “feed element  125 G” in Embodiment 3 correspond to “second element” in the present disclosure. 
     The RFIC  110 F includes switches  111 A to  111 H,  113 A to  113 H,  117 A, and  117 B; power amplifiers  112 AT to  112 HT; low-noise amplifiers  112 AR to  112 HR; attenuators  114 A to  114 H; phase shifters  115 A to  115 H; signal combiner/dividers  116 A and  116 B; mixers  118 A and  118 B; and amplifiers  119 A and  119 B. 
     Among them, a configuration of the switches  111 A to  111 D,  113 A to  113 D, and  117 A; the power amplifiers  112 AT to  112 DT; the low-noise amplifiers  112 AR to  112 DR; the attenuators  114 A to  114 D; the phase shifters  115 A to  115 D; the signal combiner/divider  116 A; the mixer  118 A; and the amplifier  119 A is a circuit for the feed elements  121 F and  121 G of a high-frequency side. Further, a configuration of the switches  111 E to  111 H,  113 E to  113 H, and  117 B; the power amplifiers  112 ET to  112 HT; the low-noise amplifiers  112 ER to  112 HR; the attenuators  114 E to  114 H; the phase shifters  115 E to  115 H; the signal combiner/divider  116 B; the mixer  118 B; and the amplifier  119 B is a circuit for the feed elements  125 F and  125 G of a low-frequency side. 
     In a case of transmitting a radio frequency signal, the switches  111 A to  111 H and  113 A to  113 H are changed over to the power amplifiers  112 AT to  112 HT, and the switches  117 A and  117 B are connected to transmission side amplifiers of the amplifiers  119 A and  119 B. In a case of receiving a radio frequency signal, the switches  111 A to  111 H and  113 A to  113 H are changed over to the low-noise amplifiers  112 AR to  112 HR, and the switches  117 A and  117 B are connected to reception side amplifiers of the amplifiers  119 A and  119 B. 
     The filter element  190  includes diplexers  190 A to  190 D. Further, the filter element  195 A includes diplexers  195 A 1  to  195 A 4 . The filter element  195 B includes diplexers  195 B 1  to  195 B 4 . Each diplexer includes a high pass filter (first filter) that allows a radio frequency signal in a high frequency band (first frequency band) to pass therethrough and a low pass filter (second filter) that allows a radio frequency signal in a low frequency band (second frequency band) to pass therethrough. “Filter element  190 ” in Embodiment 3 corresponds to “first filter element” in the present disclosure. Further, “filter element  195 A” and “filter element  195 B” in Embodiment 3 correspond to “second filter element” in the present disclosure. 
     The high pass filters in the diplexers  190 A to  190 D are respectively connected to the switches  111 A to  111 D in the RFIC  110 F. The low pass filters in the diplexers  190 A to  190 D are respectively connected to the switches  111 E to  111 H in the RFIC  110 F. Common terminals of the diplexers  190 A to  190 D are respectively connected to the first terminals T 1 A to T 1 D of the switches  130 A to  130 D of the switch circuit  130 . 
     The second terminal T 2 A of the switch  130 A is connected to the diplexer  195 A 1  of the filter element  195 A via the FEM  180 A 1 . The third terminal T 3 A of the switch  130 A is connected to the diplexer  195 B 1  of the filter element  195 B via the FEM  180 B 1 . The second terminal T 2 B of the switch  130 B is connected to the diplexer  195 A 2  of the filter element  195 A via the FEM  180 A 2 . The third terminal T 3 B of the switch  130 B is connected to the diplexer  195 B 2  of the filter element  195 B via the FEM  180 B 2 . 
     The second terminal T 2 C of the switch  130 C is connected to the diplexer  195 A 3  of the filter element  195 A via the FEM  180 A 3 . The third terminal T 3 C of the switch  130 C is connected to the diplexer  195 B 3  of the filter element  195 B via the FEM  180 B 3 . The second terminal T 2 D of the switch  130 D is connected to the diplexer  195 A 4  of the filter element  195 A via the FEM  180 A 4 . The third terminal T 3 D of the switch  130 D is connected to the diplexer  195 B 4  of the filter element  195 B via the FEM  180 B 4 . 
     The high pass filters in the diplexers  195 A 1  to  195 A 4  are respectively connected to feed elements  121 F 1  to  121 F 4  in the antenna unit  120 F. The low pass filters in the diplexers  195 A 1  to  195 A 4  are respectively connected to feed elements  125 F 1  to  125 F 4  in the antenna unit  120 F. 
     The high pass filters in the diplexers  195 B 1  to  195 B 4  are respectively connected to feed elements  121 G 1  to  121 G 4  in the antenna unit  120 G. The low pass filters in the diplexers  195 B 1  to  195 B 4  are respectively connected to feed elements  125 G 1  to  125 G 4  in the antenna unit  120 G. 
     As described above, paths through which a radio frequency signal is transferred to each radiating element is made common between the filter element  190 , and the filter element  195 A or the filter element  195 B. 
     Note that the FEMs included in the FEMs  180 A and  180 B may have the same configuration as that illustrated in  FIG.  6   , for example. Alternatively, as in an FEM  180 X illustrated in  FIG.  18   , a power amplifier  183 X 1  and a low-noise amplifier  184 X 1  that correspond to a high-frequency side circuit, and a power amplifier  183 X 2  and a low-noise amplifier  184 X 2  that correspond to a low-frequency side circuit may individually be provided. By providing a power amplifier and a low-noise amplifier suitable for each frequency, it becomes possible to appropriately adjust the antenna characteristics. 
     (Configuration of Antenna Module) 
     Next, a detailed configuration of the antenna module  100 F according to Embodiment 3 will be described with reference to  FIG.  19    to  FIG.  21   .  FIG.  19    is a side view of the antenna module  100 F.  FIG.  20    is a partial sectional view of the antenna unit  120 F.  FIG.  21    is a diagram for explaining a configuration example of a diplexer. 
     In  FIG.  19   , the antenna unit  120 A in the antenna module  100 C described with reference to  FIG.  10    above is replaced with the antenna unit  120 F, and the antenna unit  120 B is replaced with the antenna unit  120 G. Further, the RFIC  110  is replaced with the RFIC  110 F. In  FIG.  19   , the filter element  190  is newly provided on the motherboard  250 , and the filter elements  195 A and  195 B are newly provided in the antenna units  120 F and  120 G, respectively. In  FIG.  19   , the description of elements overlapping those in  FIG.  10    will not be repeated. Note that, although the BBIC  200  is mounted on the motherboard  250  in  FIG.  19   , the BBIC  200  may be formed on another substrate (not illustrated). 
     Referring to  FIG.  19    to  FIG.  21   , each of the antenna units  120 F and  120 G is configured to be capable of radiating radio waves in two different frequency bands as described above. 
     The antenna unit  120 F includes the feed element  121 F and the feed element  125 F that are formed on or in a dielectric substrate  122 F. The feed element  121 F and the feed element  125 F are arranged to overlap each other in plan view of the dielectric substrate  122 F from the normal direction, and the feed element  125 F is arranged between the feed element  121 F and the ground electrode GND. The size of the feed element  121 F is smaller than the size of the feed element  125 F. Accordingly, from the feed element  121 F, a radio wave in a frequency band higher than that of the feed element  125 F is radiated. Radio frequency signals from the RFIC  110 F are individually supplied to each of the feed element  121 F and the feed element  125 F. More specifically, as illustrated in  FIG.  20   , a radio frequency signal on a high-frequency side (39 GHz band, for example) is supplied to the feed element  121 F through a feed wiring line  191 , and a radio frequency signal on a low-frequency side (28 GHz band, for example) is supplied to the feed element  125 F through a feed wiring line  192 . The feed wiring line  191  extends through the feed element  125 F and is connected to a feed point SP 1  of the feed element  121 F. The feed wiring line  192  is connected to a feed point SP 2  of the feed element  125 F. 
     The antenna unit  120 G includes the feed element  121 G and the feed element  125 G that are formed on or in a dielectric substrate  122 G. The configuration of the antenna unit  120 G is the same as that of the antenna unit  120 F. 
     Each of the filter elements  190 ,  195 A, and  195 B includes flat plate shaped electrodes and vias as illustrated in  FIG.  21   . More specifically, each of the filter elements  190 ,  195 A, and  195 B includes a terminal T 1  to which the feed wiring line made common is connected, a terminal T 2  to which a feed wiring line of a low-frequency side is connected, and a terminal T 3  to which a feed wiring line of a high-frequency side is connected. A low pass filter  210  is formed between the terminal T 1  and the terminal T 2 , and a high pass filter  220  is formed between the terminal T 1  and the terminal T 3 . 
     The low pass filter  210  includes a linear flat plate shaped electrode  211  connected to the terminal T 1  and the terminal T 2 , and flat plate shaped electrodes  212  and  213  branching off from the flat plate shaped electrode  211  and are arranged to face each other with a predetermined gap therebetween. The flat plate shaped electrode  212  and the flat plate shaped electrode  213  are arranged to be line symmetrical in plan view in the normal direction of the substrate, and are electromagnetically coupled to each other. End portions of the flat plate shaped electrode  212  and the flat plate shaped electrode  213  are respectively connected to the ground electrode GND through a via V 1  and a via V 2 . That is, the low pass filter  210  constitutes an LC series resonance circuit of a so-called n-type circuit including: a series inductor (flat plate shaped electrode  211 ) formed between the terminal T 1  and the terminal T 2 , and two shunt stubs (flat plate shaped electrodes  212  and  213  plus vias V 1  and V 2 ) branching off therefrom. 
     The high pass filter  220  includes a linear flat plate shaped electrode  221  whose one end is connected to the terminal T 1 , flat plate shaped electrodes  222  and  223 , and a capacitor electrode C 1 . The flat plate shaped electrode  222  branches off from the flat plate shaped electrode  221 , and an end portion thereof is connected to the ground electrode GND through a via V 3 . The other end of the flat plate shaped electrode  221  faces the capacitor electrode C 1  arranged in a different layer. The flat plate shaped electrode  221  and the capacitor electrode C 1  form a capacitor. One end of the flat plate shaped electrode  223  is connected to the ground electrode GND through a via V 4 , and the other end thereof is connected to the capacitor electrode C 1  through a via V 5 . Further, the flat plate shaped electrode  223  is also connected to the terminal T 3 . That is, the high pass filter  220  constitutes an LC series resonance circuit of a so-called π-type circuit including: a series capacitor (flat plate shaped electrode  221  and capacitor electrode C 1 ) formed between the terminal T 1  and the terminal T 3 , and two shunt stubs (flat plate shaped electrodes  222  and  223  plus vias V 3  and V 5 ) branching off from both ends of the capacitor. 
     Note that, the low pass filter  210  and the high pass filter  220  may be arranged in the same layer as illustrated in  FIG.  21   , or may be arranged in different layers to partially overlap each other in plan view in the normal direction of the substrate in which the filter elements are formed. In a case where the low pass filter  210  and the high pass filter  220  are formed in different layers, the ground electrode GND is arranged in a layer between the low pass filter  210  and the high pass filter  220  in order to prevent mutual coupling. 
     The filter element  190  is formed inside the motherboard  250 . The filter element  195 A is formed inside the dielectric substrate  122 F of the antenna unit  120 F. The filter element  195 B is formed inside the dielectric substrate  122 G of the antenna unit  120 G. 
     Two radio frequency signals having different frequency bands individually outputted from the RFIC  110 F are transferred to a feed wiring line made common via the filter element  190 . The feed wiring line made common is changed over to either a signal transfer path to the antenna unit  120 F or a signal transfer path to the antenna unit  120 G by the switch circuit  130 . The feed wiring lines from the switch circuit  130  extend to the antenna units  120 F and  120 G via the connection terminal  155 , the connection member  140 , and the connection terminal  150 . 
     The feed wiring line made common reaching each antenna unit is branched into a high-frequency side path and a low-frequency side path by the filter elements  195 A and  195 B formed in the antenna units  120 F and  120 G. The high-frequency side path is connected to the feed elements  121 F and  121 G, and the low-frequency side path is connected to the feed elements  125 F and  125 G. 
     In a case of a dual-band type antenna module in which each feed element is individually fed, the same number of feed wiring lines as the number of feed elements are basically required from an RFIC to the feed elements. In particular, in a case of a so-called dual polarization type antenna unit capable of radiating radio waves in two different polarization directions from each feed element, twice as many feed wiring lines as the number of feed elements are required. For example, as illustrated in  FIG.  17    and  FIG.  19   , in a case where four feed elements are provided for each frequency band (total number of feed elements is eight), under a condition the antenna unit is a dual polarization type, 16 feed wiring lines are required for each antenna unit. In the case above, the width or thickness of the connection member needs to be increased, and there is a possibility that it will become hard to arrange a connection member in an apparatus or it becomes impossible to ensure the flexibility of the connection member. Further, with respect to the connection terminals  150 A,  150 B,  155 A, and  155 B, the same number of terminals as the number of feed wiring lines arranged in a connection member are required. This increases the size of a connector and increases an arrangement area for the connector on a motherboard and an antenna unit. 
     Meanwhile, in the antenna module  100 F according to Embodiment 3, the filter elements (diplexers)  190 ,  195 A, and  195 B are respectively arranged on the motherboard  250  and the antenna units  120 F and  120 G, so that the feed wiring lines are partially made common. This makes it possible to decrease the total number of feed wiring lines arranged in the connection members  140 A and  140 B. Thus, the size (width and thickness) of the connection members  140 A and  140 B may be reduced, and in addition, the mounting area on the motherboard  250  and the antenna units  120 F and  120 G may be reduced. Further, the number of terminals of an FEM arranged on a connection member may be decreased. 
     Next, an arrangement example of a filter element in the motherboard  250  and an antenna unit will be described.  FIG.  22    is a view illustrating an arrangement example of the filter element  190  in the motherboard  250 . Further,  FIG.  23    is a view illustrating an arrangement example of the filter element  195 A in the antenna unit  120 F. Note that, the filter element  195 B in the antenna unit  120 G may be arranged in the same manner as the filter element  195 A in  FIG.  23   . 
     Referring to  FIG.  22   , since each diplexer included in the filter element  190  is connected to the RFIC  110 F and the switch circuit  130  as described above, the filter element  190  is arranged between the RFIC  110 F and the switch circuit  130  in plan view of the motherboard  250  ( FIG.  22 ( a ) ). 
     The RFIC  110  and the switch circuit  130  are mounted on an outer surface of the motherboard  250 , and the filter element  190  is formed inside the motherboard  250 . Accordingly, the filter element  190  may be arranged at a position partially overlapping the RFIC  110 F and/or the switch circuit  130  in plan view of the motherboard  250  as in  FIG.  22 ( b ) . Further, in a case where the filter element  190  is formed as a chip component, the filter element  190  may be arranged on the outer surface of the motherboard  250 . 
     Referring to  FIG.  23   , each diplexer included in the filter element  195 A is arranged on a path connecting the connection terminal  150 A and each feed element in the antenna unit  120 F.  FIGS.  23 ( a ) and ( b )  are examples in which the filter element  195 A is arranged in a space between an end portion of the dielectric substrate  122 F on a side to which the connection member  140 A is connected, and a radiating element closest to the end portion. In  FIG.  23 ( a ) , the diplexers are arranged in two rows such that a longitudinal direction of an outer shape of each diplexer is oriented in a direction orthogonal to an arrangement direction of radiating elements. In  FIG.  23 ( b ) , the diplexers are arranged such that the longitudinal direction of the outer shape of each diplexer is oriented in the arrangement direction of the radiating elements. In the case of the arrangement above, although a size of the dielectric substrate  122 F in the arrangement direction of the radiating elements slightly increases, an increase in size in the thickness direction as seen in the example of  FIG.  23 ( d )  to be described later does not arise. Thus, the arrangement is suitable for a case of lowering a profile. 
       FIG.  23 ( c )  is an arrangement example in which each diplexer is arranged side by side with a corresponding radiating element in a direction orthogonal to the arrangement direction of the radiating elements. In the case of the arrangement example above, since a space in the vicinity of the connection with the connection member  140 A may be ensured in the dielectric substrate  122 F, the design of a wiring line layout in the dielectric substrate  122 F is facilitated. Further, since feeding can be established by a feed wiring line made common to the vicinity of each radiating element, the number of feed wiring lines in the antenna unit  120 F may be decreased. In addition, in the case above, since a radiating element and a diplexer do not overlap each other in plan view of the dielectric substrate  122 F, the arrangement is suitable for a case of lowering a profile. 
     In the arrangement example of  FIG.  23 ( d ) , a diplexer is arranged in the vicinity of each radiating element, the same as in  FIG.  23 ( c ) , but the diplexer is arranged to partially overlap the corresponding radiating element in plan view of the dielectric substrate  122 F. That is, the diplexer is arranged in the dielectric substrate  122 F in a layer lower than that of the radiating element. In the case of the arrangement above, the size of the dielectric substrate  122 F in the thickness direction may increase, but a size W 1  of the dielectric substrate  122 F in a width direction (direction orthogonal to the arrangement direction of radiating elements) may be reduced. Thus, the arrangement is suitable for reducing the antenna unit  120 F in size. 
     As described above, in a dual-band type antenna module capable of radiating radio waves in two different frequency bands, by arranging the diplexers in front and rear of a connection member, the number of feed wiring lines arranged in the connection member may be decreased. As a result, in an antenna module, an increase in size due to an increase in the number of wiring lines may be suppressed. 
     Note that, even in a case of radiating a radio wave in one frequency band, under a condition the antenna module is the dual polarization type capable of radiating radio waves in two different polarization directions, the number of feed wiring lines arranged in a connection member may be decreased by using the filter element as described above. 
     Further, in the antenna units  120 F and  120 G described above, a configuration has been described in which the feed element  121 F and the feed element  125 F are arranged to overlap each other in plan view in the normal direction of the dielectric substrate. However, the feed element  121 F and the feed element  125 F may be arranged not to overlap each other. 
     (Modification 6) 
     In Embodiment 3, for a configuration in which each radiating element is individually fed in a dual-band type antenna module, an example has been described in which a diplexer is used. 
     In Modification 6, for a dual-band type antenna module using a feed element and a parasitic element as radiating elements, an example will be described in which a diplexer is used. 
       FIG.  24    is a block diagram of a communication device  10 H to which an antenna module  100 H according to Modification 6 is applied. Referring to  FIG.  24   , the communication device  10 H includes the antenna module  100 H and the BBIC  200 . The antenna module  100 H includes an RFIC  110 H, antenna units  120 H and  120 J, the switch circuit  130 , the FEMs  180 A and  180 B, and the filter element  190 . As in the antenna module  100 F of Embodiment 3, the FEMs  180 A and  180 B are arranged on the connection member  140 , and the filter element  190  is arranged in the motherboard  250 . Note that, since the configuration of the RFIC  110 H is the same as the configuration of the RFIC  110 F of Embodiment 3, the detailed description thereof will not be repeated. 
     The antenna unit  120 H is a dual-band type antenna unit, the same as the antenna unit  120 F, but includes a feed element  121 H ( 121 H 1  to  121 H 4 ) and a parasitic element  126 H ( 126 H 1  to  126 H 4 ) as radiating elements. As illustrated in a partial sectional view of the antenna unit  120 H in  FIG.  25   , the parasitic element  126 H is arranged between the feed element  121 H and the ground electrode GND in the antenna unit  120 H. Note that “feed element  121 H” and “feed element  121 J” in Modification 6 correspond to “first element” in the present disclosure. Further, “parasitic element  126 H” and “parasitic element  126 J” in Modification 6 correspond to “second element” in the present disclosure. 
     The feed wiring line  191  extends through the parasitic element  126 H and is connected to a feed point SP 1  of the feed element  121 H. Under a condition a radio frequency signal on a high-frequency side corresponding to the feed element  121 H (39 GHz band, for example) is supplied to the feed wiring line  191 , a radio wave is radiated from the feed element  121 H. Whereas, under a condition a radio frequency signal on a low-frequency side corresponding to the parasitic element  126 H (28 GHz band, for example) is supplied to the feed wiring line  191 , the radio frequency signal is transferred to the parasitic element  126 H. This is performed in a non-contact manner by electromagnetic coupling between the feed wiring line  191  and the parasitic element  126 H in the extending portion of the feed wiring line  191 . Thus, a radio wave is radiated from the parasitic element  126 H. 
     The antenna unit  120 J includes a feed element  121 J ( 121 J 1  to  121 J 4 ) and a parasitic element  126 J ( 126 J 1  to  126 J 4 ) as radiating elements. Since the configuration of the antenna unit  120 J is the same as that of the antenna unit  120 H, the detailed description thereof will not be repeated. 
     As described above, also in a dual-band type antenna module using a feed element and a parasitic element, radio frequency signals in respective frequency bands are individually outputted from the RFIC  110 H. Thus, under a condition these signals are transferred to the antenna unit  120 H and  120 J by using individual feed wiring lines, it is necessary to arrange the same number of feed wiring lines as the number of radiating elements in the connection members  140 A and  140 B. However, in the antenna module  100 H of Modification 6, the filter element  190  including a diplexer is provided in the motherboard  250 , and a feed wiring line for transferring a radio frequency signal on a high-frequency side and a feed wiring line for transferring a radio frequency signal on a low-frequency side are made common. Thus, the number of feed wiring lines arranged in the connection members  140 A and  140 B may be decreased. As a result, in an antenna module, an increase in size due to an increase in the number of wiring lines may be suppressed. 
     Note that, in Embodiment 3 and Modification 6, a configuration has been described in which a filter element including a diplexer is used for a dual-band type antenna module. However, also in an antenna module capable of radiating radio waves in three or more different frequency bands, it is possible to decrease the number of feed wiring lines arranged in a connection member by using a filter element including a triplexer or a multiplexer. 
     Embodiment 4 
     (Configuration of Communication Device) 
     In Embodiment 4, a configuration example will be described in which a diplexer is not used in a dual-band type antenna module the same as that of Embodiment 3. 
       FIG.  26    is a block diagram of a communication device  10 Y to which an antenna module  100 Y according to Embodiment 4 is applied. Referring to  FIG.  26   , the communication device  10 Y includes the antenna module  100 Y and the BBIC  200 . The antenna module  100 Y includes an RFIC  110 Y, the antenna units  120 F and  120 G, a switch circuit  130 Y, and an FEM  180 Y. 
     The antenna units  120 F and  120 G are the same as those in Embodiment 3, and each radiating element arranged in each of the antenna units  120 F and  120 G includes two feed elements. The antenna unit  120 F includes the feed elements  121 F and  125 F, and the antenna unit  120 G includes the feed elements  121 G and  125 G. A radio frequency signal is individually supplied from the RFIC  110 Y to each feed element. 
     The RFIC  110 Y has a configuration obtained by removing the switches  111 A to  111 H, the power amplifiers  112 AT to  112 HT, and the low-noise amplifiers  112 AR to  112 HR from the RFIC  110 F illustrated in  FIG.  17   . In other words, the RFIC  110 Y includes the switches  113 A to  113 H,  117 A, and  117 B; the attenuators  114 A to  114 H; the phase shifters  115 A to  115 H; the signal combiner/divider  116 A and  116 B; the mixers  118 A and  118 B; and the amplifiers  119 A and  119 B. 
     Among them, a configuration of the switches  113 A to  113 D, and  117 A; the attenuators  114 A to  114 D; the phase shifters  115 A to  115 D; the signal combiner/divider  116 A; the mixer  118 A; and the amplifier  119 A is a circuit for the feed elements  121 F and  121 G of a high-frequency side. Further, a configuration of the switches  113 E to  113 H, and  117 B; the attenuators  114 E to  114 H; the phase shifters  115 E to  115 H; the signal combiner/divider  116 B; the mixer  118 B; and the amplifier  119 B is a circuit for the feed elements  125 F and  125 G of a low-frequency side. 
     The FEM  180 Y includes an FEM  180 YA to an FEM  180 YD. The switch  113 A and the switch  113 E are connected to the FEM  180 YA, and the switch  113 B and the switch  113 F are connected to the FEM  180 YB. Similarly, the switch  113 C and the switch  113 G are connected to the FEM  180 YC, and the switch  113 D and the switch  113 H are connected to the FEM  180 YD. 
     The switch circuit  130 Y includes a switch  130 YA to a switch  130 YD. The switch  130 YA includes switches  130 YA 1  and  130 YA 2 , and the switch  130 YB includes switches  130 YB 1  and  130 YB 2 . Similarly, the switch  130 YC includes switches  130 YC 1  and  130 YC 2 , and the switch  130 YD includes switches  130 YD 1  and  130 YD 2 . 
       FIG.  27    is a diagram for explaining a detail of the FEM  180 Y in  FIG.  26   . Note that, in  FIG.  27   , to facilitate the explanation, one configuration of the switch  130 YA to the switch  130 YD, and one configuration of the FEM  180 YA to the FEM  180 YD are representatively illustrated. 
     Referring to  FIG.  27   , the FEM  180 Y includes a power amplifier  183 Y 1  and a low-noise amplifier  184 Y 1  that are correspond to a high-frequency side circuit; a power amplifier  183 Y 2  and a low-noise amplifier  184 Y 2  that are correspond to a low-frequency side circuit; and a switch  182 Y. 
     The switch  182 Y includes two switch circuits. One switch circuit of the switch  182 Y is connected to the power amplifier  183 Y 1  and the low-noise amplifier  184 Y 1  for a high-frequency side, and connects either one of the power amplifier  183 Y 1  and the low-noise amplifier  184 Y 1  to an input terminal of a switch  130 Y 1  of the switch circuit  130 Y. The other switch circuit of the switch  182 Y is connected to the power amplifier  183 Y 2  and the low-noise amplifier  184 Y 2  for a low-frequency side, and connects either one of the power amplifier  183 Y 2  and the low-noise amplifier  184 Y 2  to an input terminal of a switch  130 Y 2  of the switch circuit  130 Y. 
     The switch  182 Y is a switch for changing over between transmission and reception of a radio wave, and under a condition a radio wave is radiated from the antenna units  120 F and  120 G, the switch circuit of the switch  182 Y is connected to the power amplifiers  183 Y 1  and  183 Y 2 . Whereas, under a condition a radio wave is received by the antenna units  120 F and  120 G, the switch circuit of the switch  182 Y is connected to the low-noise amplifiers  184 Y 1  and  184 Y 2 . 
     The switch circuit  130 Y is a circuit for changing over between the antenna unit  120 F and the antenna unit  120 G. Each of the switches  130 Y 1  and  130 Y 2  included in the switch circuit  130 Y has two output terminals. One output terminal of the switch  130 Y 1  is connected to the feed element  121 F in the antenna unit  120 F. The other output terminal of the switch  130 Y 1  is connected to the feed element  121 G in the antenna unit  120 G. Further, one output terminal of the switch  130 Y 2  is connected to the feed element  125 F in the antenna unit  120 F. The other output terminal of the switch  130 Y 2  is connected to the feed element  125 G in the antenna unit  120 G. 
     More specifically, as illustrated in  FIG.  26   , the switch  130 YA 1  in the switch  130 YA is connected to the feed element  121 F 1  and the feed element  121 G 1 . The switch  130 YA 2  in the switch  130 YA is connected to the feed element  125 F 1  and the feed element  125 G 1 . The switch  130 YB 1  in the switch  130 YB is connected to the feed element  121 F 2  and the feed element  121 G 2 . The switch  130 YB 2  in the switch  130 YB is connected to the feed element  125 F 2  and the feed element  125 G 2 . 
     Further, the switch  130 YC 1  in the switch  130 YC is connected to the feed element  121 F 3  and the feed element  121 G 3 . The switch  130 YC 2  in the switch  130 YC is connected to the feed element  125 F 3  and the feed element  125 G 3 . The switch  130 YD 1  in the switch  130 YD is connected to the feed element  121 F 4  and the feed element  121 G 4 . The switch  130 YD 2  in the switch  130 YD is connected to the feed element  125 F 4  and the feed element  125 G 4 . 
       FIG.  28    is a side view of the antenna module  100 Y in  FIG.  26   . As in the antenna module  100 A of Embodiment 2 illustrated in  FIG.  7   , the antenna module  100 Y has a configuration in which the antenna unit  120 F and the antenna unit  120 G are arranged on a common connection member  140 Y. The switch circuit  130 Y and the FEM  180 Y are arranged on a front surface  141 Y of the connection member  140 Y. 
     Whereas, the switch circuit  130  on the motherboard  250  is removed, and a signal from the RFIC  110 Y is transferred to the FEM  180 Y via the connection terminal  155  through the connection wiring line  170 . As described above, a signal from the FEM  180 Y is branched by the switch circuit  130 Y and transferred to the antenna unit  120 F or the antenna unit  120 G. 
     With the configuration above, a radio wave on a high-frequency side and a radio wave on a low-frequency side may be radiated from or received by the antenna units  120 F and  120 G while being changed over, without using the diplexer  190 ,  195 A, or  195 B as in Embodiment 3. Further, by providing high-frequency side and low-frequency side power amplifiers and high-frequency side and low-frequency side low-noise amplifiers in the FEM  180 Y, an antenna characteristic at each frequency may appropriately be adjusted, and the configuration of the RFIC  110 Y may be simplified. 
     Note that, in the antenna module  100 Y described above, the configuration has been described in which a power amplifier and a low-noise amplifier are arranged in the FEM  180 Y and a power amplifier and a low-noise amplifier are not provided in the RFIC  110 Y. However, power amplifiers and low-noise amplifiers may be provided in both an FEM and an RFIC. In the case above, the loads of the power amplifier and the low-noise amplifier may be shared by the FEM and the RFIC. Accordingly, although the size of the RFIC becomes slightly larger than that of the antenna module  100 Y described above, the size of the FEM arranged on a flexible substrate (connection member  140 Y) may be reduced. 
     It should be understood that the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present disclosure is indicated by the claims rather than the foregoing description of the embodiments, and is intended to include all modifications within the meaning and scope equivalent to the claims. 
     REFERENCE SIGNS LIST 
     
         
         
           
               10 ,  10 A,  10 F,  10 H,  10 Y COMMUNICATION DEVICE 
               50  HOUSING 
               51 ,  52  MAIN SURFACE 
               55  to  58  SIDE SURFACE 
               100 ,  100 A to  100 F,  100 H,  100 X,  100 Y ANTENNA MODULE 
               110 ,  110 F,  110 H,  110 Y RFIC 
               111 A to  111 H,  113 A to  113 H,  117 ,  117 A,  117 B,  130 A to 
               130 D,  130 Y 1 ,  130 Y 2 ,  130 YA to  130 YD,  181 ,  181 X,  182 ,  182 X, 
               182 Y SWITCH 
               112 AR to  112 HR,  184 ,  184 X 1 ,  184 X 2 ,  184  Y 1 ,  184 Y 2  LOW-NOISE AMPLIFIER 
               112 AT to  112 HT,  183 ,  183 X 1 ,  183 X 2 ,  183  Y 1 ,  183 Y 2  POWER AMPLIFIER 
               114 A to  114 H ATTENUATOR 
               115 A to  115 H PHASE SHIFTER 
               116 ,  116 A,  116 B SIGNAL COMBINER/DIVIDER 
               118 ,  118 A,  118 B MIXER 
               119 ,  119 A,  119 B AMPLIFIER 
               120 ,  120 A to  120 C,  120 F to  120 H,  120 J ANTENNA UNIT 
               121 ,  121 A,  121 A 1  to  121 A 4 ,  121 B,  121 B 1  to  121 B 4 ,  121 F,  121 F 1  to  121 F 4 ,  121 G,  121 G 1  to  121 G 4 ,  121 H,  121 H 1  to  121 H 4 ,  121 J,  121 J 1  to  121 J 4 ,  125 F,  125 F 1  to  125 F 4 ,  125 G,  125 G 1  to  125 G 4  FEED ELEMENT 
               122 ,  122 A,  122 B,  122 F to  122 H,  122 J,  143  DIELECTRIC SUBSTRATE 
               123 ,  140 ,  140 A to  140 D,  140 Y CONNECTION MEMBER 
               126 H,  126 H 1  to  126 H 4 ,  126 J,  126 J 1  to  126 J 4  PARASITIC ELEMENT 
               130 ,  130 X,  130 Y SWITCH CIRCUIT 
               150 A,  150 B,  150 X,  150 Y,  155 ,  155 A,  155 B CONNECTION TERMINAL 
               160 A,  160 B,  161 ,  162 ,  191 ,  192  FEED WIRING LINE 
               170 ,  171 ,  260  CONNECTION WIRING LINE 
               180 A,  180 A 1  to  180 A 4 ,  180 B,  180 B 1  to  180 B 4 ,  180 X,  180 Y, 
               180 YA to  180 YD FEM 
               190 ,  195 A,  195 B FILTER ELEMENT 
               190 A to  190 D,  195 A 1  to  195 A 4 ,  195 B 1  to  195 B 4  DIPLEXER 
               200  BBIC 
               210  LOW PASS FILTER 
               220  HIGH PASS FILTER 
               211  to  213 ,  221  to  223  FLAT PLATE SHAPED ELECTRODE 
               250  MOTHERBOARD 
             C 1  CAPACITOR ELECTRODE 
             GND GROUND ELECTRODE 
             SP 1 , SP 2  FEED POINT 
           
         
       
    
     T 1 , T 1 A to T 1 D, T 2 , T 2 A to T 2 D, T 3 , T 3 A to T 3 D TERMINAL 
     V 1  to V 5  VIA