Patent Publication Number: US-2023135728-A1

Title: High-frequency circuit module

Description:
TECHNICAL FIELD 
     The present disclosure relates to a high frequency circuit module. This application claims priority on Japanese Patent Application No. 2020-085423 filed on May 14, 2020, the entire content of which is incorporated herein by reference. 
     BACKGROUND ART 
     When a device such as a high frequency circuit module is mounted on a printed circuit board, impedance matching is required at a connection portion between a terminal of the device and a circuit on the printed circuit board. PATENT LITERATURE 1 discloses a printed circuit board having a microstrip line structure, in which a part of a trace layer (ground) directly below a pad at a surface layer connected to a terminal of a device is removed to adjust an impedance. 
     CITATION LIST 
     Patent Literature 
     PATENT LITERATURE 1: Japanese Laid-Open Patent Publication No. 2009-140993 
     SUMMARY OF THE INVENTION 
     A high frequency circuit module according to one aspect of the present disclosure is mounted on a first board as a printed circuit board, and includes: a second board; a high frequency circuit disposed on a first surface of the second board; a high frequency signal line disposed on the first surface of the second board, and extending from the high frequency circuit; and a matching member disposed on the first surface so as to cover at least a part of the high frequency signal line, and configured to adjust an impedance in the high frequency signal line. The matching member includes: a reference potential conductor separated from the high frequency signal line in a direction from a second surface, of the second board, opposite to the first surface, toward the first surface, the reference potential conductor being set at a reference potential; and a dielectric disposed between the reference potential conductor and the high frequency signal line. 
     The present disclosure can be realized not only as a high frequency circuit module having such a characteristic configuration as described above, but also as a communication device including the high frequency circuit module. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    shows an example of a configuration of a high frequency circuit module according to an embodiment. 
         FIG.  2    is a cross-sectional view taken along an A-A line in  FIG.  1   . 
         FIG.  3    is a side sectional view showing a manner of mounting a matching member on a board according to the embodiment. 
         FIG.  4    is a block diagram showing an example of a configuration of a high frequency circuit according to the embodiment. 
         FIG.  5    is a plan view showing an example of a state where the high frequency circuit module according to the embodiment is mounted on a printed circuit board. 
         FIG.  6    is a side sectional view showing an example of a state where the high frequency circuit module according to the embodiment is mounted on a printed circuit board. 
         FIG.  7    is a side sectional view showing one modification of the configuration of the high frequency circuit module according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     &lt;Problems to be Solved by the Present Disclosure&gt; 
     For example, as a result of a design change in the printed circuit board, impedance mismatching may occur at the connection portion between the terminal of the device and the circuit on the printed circuit board. A device capable of easily adjusting the impedance in accordance with such a design change in the printed circuit board, has been desired. 
     &lt;Effects of the Present Disclosure&gt; 
     According to the present disclosure, impedance matching is achieved at a connection portion between a terminal of a high frequency circuit module and a circuit on a printed circuit board, in accordance with a design change in the printed circuit board. 
     &lt;Outline of Embodiment of the Present Disclosure&gt; 
     Hereinafter, the outline of an embodiment of the present disclosure is listed and described. 
     (1) A high frequency circuit module according to the present embodiment is mounted on a first board as a printed circuit board, and includes: a second board; a high frequency circuit disposed on a first surface of the second board; a high frequency signal line disposed on the first surface of the second board, and extending from the high frequency circuit; and a matching member disposed on the first surface so as to cover at least a part of the high frequency signal line, and configured to adjust an impedance in the high frequency signal line. The matching member includes: a reference potential conductor separated from the high frequency signal line in a direction from a second surface, of the second board, opposite to the first surface, toward the first surface, the reference potential conductor being set at a reference potential; and a dielectric disposed between the reference potential conductor and the high frequency signal line. Thus, the matching member is configured in accordance with the configuration of the first board, whereby impedance matching can be achieved at the connection portion between the terminal of the high frequency circuit module and the wiring on the first board. 
     (2) The high frequency circuit module according to the present embodiment may further include a ground terminal disposed on the second surface of the second board, and a via penetrating the second board at the ground terminal, and the reference potential conductor may be conductive to the ground terminal through the via. Thus, the potential in the reference potential conductor can be set to a ground potential in the first board. 
     (3) In the high frequency circuit module according to the present embodiment, a pair of the ground terminals may be disposed on the second surface, a pair of the vias may penetrate the second board at the pair of the ground terminals, respectively, and opposed ends of the reference potential conductor may be connected to the pair of the vias, respectively. Thus, the matching member lies across the high frequency signal line like a bridge, whereby the matching member can be stably mounted to the second board. 
     (4) In the high frequency circuit module according to the present embodiment, the matching member may be constituted by a third board including a conductor foil and an insulating base material, the reference potential conductor may be formed of the conductor foil, and the dielectric may be formed of the insulating base material. Thus, the matching member can be easily constituted by the third board as a printed circuit board. 
     (5) In the high frequency circuit module according to the present embodiment, the reference potential conductor may be conductive to a ground terminal disposed on the second board, through a second via penetrating the third board. Thus, the reference potential conductor can be connected to the ground terminal by a simple configuration. 
     (6) In the high frequency circuit module according to the present embodiment, the impedance in the high frequency signal line may be adjusted by at least one of a width of the conductor foil and a thickness of the insulating base material. Thus, the impedance in the high frequency signal line can be easily adjusted. 
     &lt;Details of Embodiment of the Present Disclosure&gt; 
     Hereinafter, details of the embodiment of the present invention will be described with reference to the drawings. At least some parts of the embodiment described below may be combined together as desired. 
     [1. High Frequency Circuit Module] 
       FIG.  1    shows an example of a configuration of a high frequency circuit module according to the present embodiment. 
     The high frequency circuit module  10  includes a board (second board)  50 , an RF (Radio Frequency) circuit  100 , an RF signal line  200 , GND (ground) conductors  300 A,  300 B, and a matching member  400 . 
     The board  50  is, for example, a double-faced printed circuit board. A printed circuit formed of a conductor foil is disposed on each of a front surface (first surface) and a rear surface (second surface) of the printed circuit board. 
     The RF circuit  100  is disposed on the front surface of the board  50 . The RF circuit  100  is an example of a high frequency circuit, and outputs an RF signal (high frequency signal). 
     The RF signal line  200  is disposed on the front surface of the board  50 . The RF signal line  200  extends from the RF circuit  100 , and transmits the RF signal outputted from the RF circuit  100 . The RF signal line  200  is formed of a conductor foil. 
     The GND conductors  300 A,  300 B are disposed on the surface of the board  50  so as to sandwich the RF signal line  200 . The GND conductors  300 A,  300 B are formed of a conductor foil. 
       FIG.  2    is a cross-sectional view taken along an A-A line in  FIG.  1   . The board  50  includes an insulating base material  51 , and a conductor foil that forms a microstrip line, for example. In  FIG.  2   , the thickness of the conductor foil is shown larger than its actual thickness. 
     As shown in  FIG.  2   , at an end portion of the RF signal line  200 , a through-hole  210  penetrating the board  50  is provided. Furthermore, at the GND conductors  300 A,  300 B, a pair of through-holes (vias)  310 A,  310 B penetrating the board  50  are provided. The inner peripheries of the through-holes  210 ,  310 A, and  310 B are plated with copper or the like. 
     On the rear surface (second surface) of the board  50 , an output terminal  220  is disposed. The output terminal  220  is formed of a conductor foil. The output terminal  220  is positioned directly below the end portion of the RF signal line  200 , and the RF signal line  200  and the output terminal  220  are conductive to each other through the through-hole  210 . 
     On the rear surface of the board  50 , a pair of GND terminals  320 A,  320 B are disposed so as to sandwich the output terminal  220 . Each of the GND terminals  320 A,  320 B is formed of a conductor foil. The GND terminal  320 A is positioned directly below the GND conductor  300 A, and the GND terminal  320 B is positioned directly below the GND conductor  300 B. The GND terminal  320 A and the GND conductor  300 A are conductive to each other through the through-hole  310 A, and the GND terminal  320 B and the GND conductor  300 B are conductive to each other through the through-hole  310 B. 
     The matching member  400  is disposed on the front surface of the board  50 . The matching member  400  includes a reference potential conductor  410  and a dielectric  420 . The reference potential conductor  410  is separated from the RF signal line  200  in a height direction of the board  50 , e.g., in a direction from the rear surface toward the front surface of the board  50 . The reference potential conductor  410  has a plate shape or a foil shape. The reference potential conductor  410  is disposed in parallel to the RF signal line  200  in the height direction so as to be positioned directly above the RF signal line  200 . In a specific example, the reference potential conductor  410  is positioned directly above the end portion of the RF signal line  200 . 
     The dielectric  420  is disposed between the reference potential conductor  410  and the RF signal line  200 . In a specific example, the reference potential conductor  410  is mounted to a front surface of the dielectric  420 . That is, the reference potential conductor  410  and the dielectric  420  are disposed in a layered state. The dielectric  420  has the same shape as the reference potential conductor  410  in a plan view. In a specific example, the reference potential conductor  410  and the dielectric  420  have congruent rectangular shapes in a plan view. 
     A pair of connection conductors  440 A,  440 B are disposed on a rear surface of the dielectric  420 . The connection conductors  440 A,  440 B are disposed at opposed ends of the dielectric  420 . Each of the connection conductors  440 A,  440 B is formed of a conductor foil. 
     For example, the matching member  400  is constituted by a printed circuit board (third board). The reference potential conductor  410  is a conductor foil of the printed circuit board, for example. The dielectric  420  is an insulating base material of the printed circuit board, for example. The matching member  400  has a pair of through-holes (second vias)  430 A,  430 B at opposed end portions of the reference potential conductor  410 . The inner peripheries of the through-holes  430 A,  430 B are plated with copper or the like. The connection conductors  440 A,  440 B are positioned directly below the opposed ends of the reference potential conductor  410 , respectively. One end of the reference potential conductor  410  and the connection conductor  440 A are conductive to each other through the through-hole  430 A, and the other end of the reference potential conductor  410  and the connection conductor  440 B are conductive to each other through the through-hole  430 B. 
       FIG.  3    is a side sectional view showing a manner of mounting the matching member  400  on the board  50  according to the present embodiment. The matching member  400  is mounted on the board  50  formed as a separate component. The distance between the connection conductor  440 A and the connection conductor  440 B is substantially equal to the distance between the GND conductor  300 A and the GND conductor  300 B. The connection conductors  440 A,  440 B are positioned with respect to the GND conductors  300 A,  300 B, respectively. That is, the connection conductor  440 A is connected to the GND conductor  300 A, and the connection conductor  440 B is connected to the GND conductor  300 B. Thus, the reference potential conductor  410  is conductive to the GND terminals  320 A,  320 B. 
       FIG.  2    is referred to again. On the front surface of the board  50  having the matching member  400  mounted thereto, a liquid synthetic resin is laminated and then solidified, thereby forming a mold resin  500 . The mold resin  500  seals the RF circuit  100 , the RF signal line  200 , the GND conductors  300 A,  300 B, and the matching member  400 . 
     [2. Example of High Frequency Circuit] 
       FIG.  4    is a block diagram showing an example of a configuration of a high frequency circuit according to the present embodiment. An amplification circuit  100 A shown in  FIG.  4    is a circuit for amplifying a radio communication signal, and is an example of a high frequency circuit  100 . The amplification circuit  100 A includes a driver amplifier  110  and a Doherty amplification circuit  120 . The Doherty amplification circuit  120  includes a distributor  130 , input matching circuits  140 A,  140 B, a phase delay circuit  150 , a carrier amplifier  160 A, an output matching circuit  170 , a peak amplifier  160 B, and an impedance conversion circuit  180 . 
     The driver amplifier  110 , the carrier amplifier  160 A, and the peak amplifier  160 B are constituted by transistor chips such as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), a GaN HEMT (Gallium Nitride High-Electron-Mobility Transistor), and the like. The driver amplifier  110 , the carrier amplifier  160 A, and the peak amplifier  160 B may be constituted by transistor chips having the same structure, material, and characteristics, or may be constituted by transistor chips different in at least one of the structure, material, and characteristics. 
     In the amplification circuit  100 A, the driver amplifier  110  is a preamplifier, and an input side of the Doherty amplification circuit  120  is connected to an output terminal (drain terminal) of the driver amplifier  110 . More specifically, a signal line  111  extending from the output terminal of the driver amplifier  110  is connected to the input side of the Doherty amplification circuit  120 . 
     The Doherty amplification circuit  120  includes the distributor  130 . The aforementioned signal line  111  is connected to an input terminal of the distributor  130 . Signal lines  112 ,  113  extend from two output terminals of the distributor  130 , respectively. The driver amplifier  110  amplifies an inputted high frequency signal, and outputs the amplified signal. The distributor  130  distributes the high frequency signal outputted from the driver amplifier  110  to the signal lines  112 ,  113 . 
     The signal line  112  is connected to an input terminal (gate terminal) of the carrier amplifier  160 A through the input matching circuit  140 A. The carrier amplifier  160 A is biased at class A or AB, amplifies an input signal regardless of the power level of the input signal, and outputs the amplified signal (first amplified signal). 
     The signal line  113  is connected to an input terminal (gate terminal) of the peak amplifier  160 B through the phase delay circuit  150  and the input matching circuit  140 B. The phase delay circuit  150  gives a phase delay of 90° to the input signal. The peak amplifier  160 B is biased at class C, amplifies an input signal when the power level of the input signal is not lower than a predetermined value, and outputs the amplified signal (second amplified signal). 
     An output terminal (drain terminal) of the carrier amplifier  160 A is connected to the output matching circuit  170 . An output signal line  114  extends from the output matching circuit  170 . The output matching circuit  170  gives a phase delay of 90° to the input signal. The output matching circuit  170  is an impedance conversion circuit, and adjusts a load impedance of the carrier amplifier  160 A. The output signal line  114  transmits the first amplified signal outputted from the carrier amplifier  160 A. 
     An output signal line  115  extends from the output terminal (drain terminal) of the peak amplifier  160 B. The output signal line  115  transmits the second amplified signal outputted from the peak amplifier  160 B. The output signal line  114  and the output signal line  115  are coupled with each other and connected to the impedance conversion circuit  180 . 
     A synthetic signal of the amplified signal (first amplified signal) outputted from the peak amplifier  160 B and the amplified signal (second amplified signal) outputted from the carrier amplifier  160 A, is inputted to the impedance conversion circuit  180 . The impedance conversion circuit  180  adjusts the impedance in the entire Doherty amplification circuit  120 . 
     When the power level of the input signal from the driver amplifier  110  is low, the Doherty amplification circuit  120  having the above configuration amplifies the signal by the carrier amplifier  160 A, and outputs the amplified signal. Meanwhile, when the power level of the input signal from the driver amplifier  110  is high, the Doherty amplification circuit  120  amplifies the signal by each of the carrier amplifier  160 A and the peak amplifier  160 B, synthesizes the two amplified signals, and outputs a synthetic signal. The output side of the impedance conversion circuit  180  is connected to the RF signal line  200 . The RF signal line  200  transmits an output signal, of the amplification circuit  100 A, which is a high frequency signal. 
     [3. Example of Mounting of High Frequency Circuit Module] 
     The high frequency circuit module  10  is mounted on a main board (first board).  FIG.  5    is a plan view showing an example of a state where the high frequency circuit module according to the present embodiment is mounted on a printed circuit board.  FIG.  6    is a side sectional view thereof. On a main board  600 , for example, a transmission circuit for radio communication, a signal processing circuit, etc., are mounted in addition to the high frequency circuit module  10 . The main board (first board)  600  is, for example, a double-faced printed circuit board having a microstrip structure. A printed circuit formed of a conductor foil is formed on each of a front surface and a rear surface of the main board  600 . 
     The main board  600  includes an insulating base material  630 , and a conductor foil that forms a microstrip line, for example. In  FIG.  6   , the thickness of the conductor foil is shown larger than its actual thickness. 
     On the front surface of the main board  600 , a signal line  610  and GND conductors  620 A,  620 B are disposed. Each of the signal line  610  and the GND conductors  620 A,  620 B is formed of a conductor foil. 
     An end portion of the signal line  610  is a terminal, and the terminal is connected to an output terminal  220  of the high frequency circuit module  10 . 
     Each of the GND conductors  620 A,  620 B is set at a ground potential. The GND conductor  620 A is connected to the GND terminal  320 A of the high frequency circuit module  10 , and the GND conductor  620 B is connected to the GND terminal  320 B of the high frequency circuit module  10 . Thus, the reference potential conductor  410  and the GND conductors  620 A,  620 B are conductive to one another, and the reference potential conductor  410  is set at the ground potential. Furthermore, on the rear surface of the main board  600 , a ground plane  640  formed of a conductor foil is disposed. 
     [4. Impedance Adjustment by Matching Member] 
     A characteristic impedance in a microstrip line is expressed by the following formula. 
     
       
         
           
             
               
                 
                   
                     Z 
                     0 
                   
                   = 
                   
                     
                       60 
                       
                         
                           
                             0.475 
                             
                               ε 
                               r 
                             
                           
                           + 
                           0.67 
                         
                       
                     
                     ⁢ 
                     
                       ln 
                       [ 
                       
                         
                           4 
                           ⁢ 
                               
                           h 
                         
                         
                           0.67 
                           
                             ( 
                             
                               
                                 0.8 
                                     
                                 W 
                               
                               + 
                               t 
                             
                             ) 
                           
                         
                       
                       ] 
                     
                   
                 
               
               
                 
                   [ 
                   
                     Math 
                     . 
                         
                     1 
                   
                   ] 
                 
               
             
           
         
       
     
     where w indicates the line width, h indicates the height of the insulating base material  630 , and t indicates the thickness (height) of the conductor foil. Therefore, the characteristic impedance in the signal line  610  can be obtained by the above formula. 
     The impedance at the output terminal  220  is required to be matched to the impedance in the signal line  610 . In the high frequency circuit module  10  according to the present embodiment, the impedance at the output terminal  220  is easily adjusted by the matching member  400 . 
     As shown in  FIG.  2   , the dielectric  420  is disposed between the RF signal line  200  and the reference potential conductor  410 . Therefore, the RF signal line  200 , the reference potential conductor  410 , and the dielectric  420  form a capacitor. In  FIG.  2   , since the thickness of the conductor foil is shown larger than its actual thickness, a gap is present between the dielectric  420  and the RF signal line  200 . However, since the actual thickness of the conductor foil is several tens of micrometers at most, the dielectric  420  is in contact with the RF signal line  200 . Even if the dielectric  420  and the RF signal line  200  are separated from each other, the distance between them is several tens of micrometers. Moreover, even when an air layer or another insulator (synthetic resin or the like) is present between the dielectric  420  and the RF signal line  200 , insulation between the RF signal line  200  and the reference potential conductor  410  is maintained, so that the function as the capacitor is similarly achieved. 
     By the capacitance of the capacitor, the impedance in the RF signal line  200 , i.e., the impedance at the output terminal  220 , is determined. 
     The capacitance of a plate capacitor is proportional to a distance between opposing electrodes (i.e., a thickness of a dielectric) and an area of the opposing electrodes. Therefore, in the high frequency circuit module  10  according to the present embodiment, the capacitance is determined based on a width W of the reference potential conductor  410  (see  FIG.  1   ) and a thickness (height) T of the dielectric  420  (see  FIG.  2   ), and as a result, the impedance at the output terminal  220  is determined. Therefore, the impedance at the output terminal  220  can be easily adjusted by adjusting the width W of the reference potential conductor  410  and the thickness T of the dielectric  420 . 
     [5. Modifications] 
     In the above embodiment, the through-holes  430 A,  430 B are disposed at the opposed ends of the reference potential conductor  410 , and the connection conductors  440 A,  440 B respectively disposed below the through-holes  430 A,  430 B are respectively connected to the pair of GND conductors  300 A,  300 B. However, the present disclosure is not limited to this configuration.  FIG.  7    is a side sectional view showing one modification of the configuration of the high frequency circuit module according to the present embodiment. In  FIG.  7   , the through-hole  430 A is disposed at one end of the reference potential conductor  410 , and the connection conductor  440 A disposed below the through-hole  430 A is connected to one GND conductor  300 A. In this modification, as well, the reference potential conductor  410  is disposed so as to cover the RF signal line  200 , and the dielectric  420  is disposed between the reference potential conductor  410  and the RF signal line  200 . Therefore, also in this configuration, the impedance at the output terminal  220  can be adjusted. 
     In the above embodiment, the reference potential conductor  410  is conductive to the GND terminals  320 A,  320 B disposed on the board  50 , whereby the potential of the reference potential conductor  410  is set to the ground potential in the main board  600 . The potential of the reference potential conductor  410  may be any potential as long as it is a fixed potential. For example, the reference potential may be a ground potential of an RF signal outputted from the RF circuit  100 , i.e., a DC power supply potential in the RF circuit  100 . 
     In the above embodiment, the board  50  is a double-faced printed circuit board. However, the present disclosure is not limited thereto. For example, the board  50  may be a multilayer printed circuit board. In this case, the output terminal  220  may not necessarily be disposed on the rear surface of the board  50 , and may be disposed inside the board  50 . The RF signal line  200  and the output terminal  220  may be conductive to each other not through the through-hole  210  but through an inner via. Moreover, the GND terminals  320 A,  320 B may not necessarily be disposed on the rear surface of the board  50 , and may be disposed inside the board  50 . The GND conductors  300 A,  300 B may be conductive to the GND terminals  320 A,  320 B not through the through-holes  310 A,  310 B but through inner vias, respectively. 
     [6. Effects] 
     As described above, the high frequency circuit module  10  is mounted on the main board  600  which is a printed circuit board. The high frequency circuit module  10  includes the board  50 , the RF circuit  100 , the RF signal line  200 , and the matching member  400 . The RF circuit  100  is disposed on the front surface of the board  50 . The RF signal line  200  is disposed on the front surface of the board  50 , and extends from the RF circuit  100 . The matching member  400  is disposed on the front surface of the board  50  so as to cover at least a part of the RF signal line  200 . The matching member  400  adjusts the impedance in the RF signal line  200 . The matching member  400  includes the reference potential conductor  410  and the dielectric  420 . The reference potential conductor  410  is separated from the RF signal line in the direction from the rear surface toward the front surface of the board  50 , and is set at the reference potential. The dielectric  420  is disposed between the reference potential conductor  410  and the RF signal line  200 . Thus, the matching member is configured in accordance with the configuration of the first board, whereby impedance matching can be achieved at the connection portion between the terminal of the high frequency circuit module and the circuit on the first board. 
     The high frequency circuit module  10  may further include the GND terminals  320 A,  320 B and the through-holes  310 A,  310 B. The GND terminals  320 A,  320 B are disposed on the rear surface of the board  50 . The through-holes  310 A,  310 B penetrate the board  50  at the GND terminals  320 A,  320 B. The reference potential conductor  410  may be conductive to the GND terminals  320 A,  320 B through the through-holes  310 A,  310 B. Thus, the potential in the reference potential conductor  410  can be set to the GND potential in the main board  600 . 
     The pair of GND terminals  320 A,  320 B may be disposed on the rear surface of the board  50 . The through-holes  310 A,  310 B may penetrate the board  50  at the pair of GND terminals  320 A,  320 B, respectively. The opposed ends of the reference potential conductor  410  may be connected to the pair of through-holes  310 A,  310 B, respectively. Thus, the matching member  400  lies across the RF signal line  200  like a bridge, whereby the matching member  400  can be stably mounted to the board  50 . 
     The matching member  400  may be constituted by a printed circuit board including a conductor foil and an insulating base material. The reference potential conductor  410  may be formed of the conductor foil. The dielectric  420  may be formed of the insulating base material. Thus, the matching member  400  can be easily constituted by the printed circuit board. 
     The reference potential conductor  410  may be conductive to the GND terminals  320 A,  320 B disposed on the board  50  through the through-holes  430 A,  430 B penetrating the printed circuit board. Thus, the reference potential conductor  410  can be connected to the GND terminals  320 A,  320 B by a simple structure. 
     The impedance in the RF signal line  200  may be adjusted by at least one of the width of the conductor foil forming the reference potential conductor  410  and the thickness of the insulating base material forming the dielectric  420 . Thus, the impedance in the RF signal line  200  can be easily adjusted. 
     [7. Supplementary Note] 
     The embodiment disclosed herein is merely illustrative in all aspects and is not restrictive. The scope of the present disclosure is defined by the scope of the claims rather than the embodiment described above, and is intended to include meaning equivalent to the scope of the claims and all modifications within the scope. 
     REFERENCE SIGNS LIST 
       10  high frequency circuit module 
       50  board (second board) 
       51  insulating base material 
       100  RF circuit (high frequency circuit) 
       100 A amplification circuit 
       110  driver amplifier 
       111  to  115  signal line 
       120  Doherty amplification circuit 
       130  distributor 
       140 A,  140 B input matching circuit 
       150  phase delay circuit 
       160 A carrier amplifier 
       160 B peak amplifier 
       170  output matching circuit 
       180  impedance conversion circuit 
       200  RF signal line (radio frequency signal line) 
       210  through-hole 
       430 A,  430 B through-hole 
       220  output terminal 
       300 A,  300 B GND conductor 
       310 A,  310 B through-hole (via) 
       320 A,  320 B GND terminal (ground terminal) 
       400  matching member 
       410  reference potential conductor 
       420  dielectric 
       440 A,  440 B connection conductor 
       430 A,  430 B through-hole (second via) 
       500  mold resin 
       600  main board (first board) 
       610  signal line 
       630  insulating base material 
       620 A,  620 B GND conductor 
       640  ground plane