Amplifier module and radio communications system

Abstract

To provide an amplifier module which can notify a main body part of a connection state of an antenna, and has a simple construction, and provide a radio communications system.SOLUTION: An amplifier module is arranged between an antenna for radio communication and a main body part of a radio communication device, and is connected to the antenna via a first wiring member, and is connected to the main body part via a second wiring member, and contains: an antenna side terminal to which the first wiring member is connected; a main body side terminal to which the second wiring member is connected; an amplification part that is provided between the antenna side terminal and the main body side terminal; an impedance detection part that detects an impedance of the antenna side terminal; a determination part that determines a connection state of the antenna to the antenna side terminal on the basis of the impedance detected by the impedance detection part; and a control part that causes the amplification part to output a first state signal expressing the connection state to the main body side terminal when the determination part determines that the connection state is abnormal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an amplifier module and a wireless communication system. [Background technology]

[0002] Conventionally, there is an amplifier module that is disposed between an antenna for wireless communication and a main body of a wireless communication device and is connected to the antenna and the main body via a wiring member. The amplifier module includes an antenna side terminal connected to the antenna, a main body side terminal connected to the main body, an amplifier circuit provided between the antenna side terminal and the main body side terminal, an antenna detection circuit that detects electrical characteristics of the antenna side terminal, and a characteristic variable circuit that changes the electrical characteristics of the main body side terminal based on the electrical characteristics of the antenna side terminal detected by the antenna detection circuit (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 059172 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional amplifier modules require a characteristic variable circuit that changes the electrical characteristics of the terminals on the main body side, and there is room for further simplification of the configuration.

[0005] It is therefore an object of the present invention to provide an amplifier module and a wireless communication system that are capable of notifying a main body unit of the connection state of an antenna and have a simple configuration. [Means for solving the problem]

[0006] An amplifier module of an embodiment of the present invention is an amplifier module that is arranged between an antenna for wireless communication and a main body of a wireless communication device, connected to the antenna via a first wiring member and connected to the main body via a second wiring member, and includes an antenna side terminal to which the first wiring member is connected, a main body side terminal to which the second wiring member is connected, an amplifier unit provided between the antenna side terminal and the main body side terminal, an impedance detection unit that detects the impedance of the antenna side terminal, a determination unit that determines the connection state of the antenna to the antenna side terminal based on the impedance detected by the impedance detection unit, and a control unit that causes the amplifier to output a first status signal representing the connection state to the main body side terminal side when the determination unit determines that the connection state is abnormal. Effect of the Invention

[0007] It is possible to provide an amplifier module and a wireless communication system that are capable of notifying a main body unit of the connection state of an antenna and have a simple configuration. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating an example of an arrangement of an amplifier module and a wireless communication system according to an embodiment; [Figure 2A] FIG. 2 illustrates an example of a circuit configuration of a wireless communication system according to an embodiment. [Figure 2B] FIG. 2 illustrates an example of an internal configuration of an amplifier module according to an embodiment. [Diagram 3] 4A to 4C are diagrams illustrating examples of a first status signal, a second status signal, and a third status signal. [Figure 4] 11 is a flowchart illustrating an example of a process executed by an MCU of the amplifier module according to the embodiment. [Diagram 5] FIG. 13 is a diagram illustrating an example of a circuit configuration of a wireless communication system according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment in which an amplifier module and a wireless communication system according to the present invention are applied will be described.

[0010] <Embodiment Mode> 1 is a diagram showing an example of the arrangement of an amplifier module 100 and a wireless communication system 200 according to an embodiment. A vehicle 1 is equipped with an antenna 10 for wireless communication, a main body 20 of a wireless communication device, a cable 30 (30A and 30B) for communication, and an amplifier module 100. The wireless communication system 200 includes the antenna 10, the main body 20, the cable 30 (30A and 30B), and the amplifier module 100. The cable 30A is an example of a first wiring member, and the cable 30B is an example of a second wiring member.

[0011] The vehicle 1 is typically a passenger car, but may be any type of vehicle. The antenna 10 is an antenna for C-V2X communication (a general term for vehicle-to-vehicle communication and road-to-vehicle communication using cellular) located at the rear end of the roof of the vehicle 1, but is not limited to this type. The cable 30 has a cable 30A that connects the antenna 10 and the amplifier module 100, and a cable 30B that connects the amplifier module 100 and the main body 20.

[0012] The main body 20 is a part having a main function of the wireless communication device. The main body 20 has a terminal 20A to which the cable 30B is connected. The main body 20 is combined with the antenna 10, the cable 30, and the amplifier module 100 to configure the wireless communication device. The main body 20 is, for example, a navigation ECU (Electronic Control Unit) equipped with a wireless communication function, and is, for example, disposed near the dashboard of the vehicle 1. The amplifier module 100 is connected to the antenna 10 via the cable 30A, and is connected to the main body 20 via the cable 30B. The amplifier module 100 is located between the antenna 10 and the main body 20 in an electrical connection relationship via the cables 30A and 30B. As the cable 30, a coaxial cable or the like is used in consideration of the influence of electromagnetic noise, but is not limited to this type.

[0013] For example, cable 30A is passed through the underside of the roof of vehicle 1, and cable 30B is passed through the inside of an A-pillar and the underside of the roof of vehicle 1. For example, cable 30A and cable 30B have FAKRA plugs, and antenna 10, main body 20, and amplifier module 100 have FAKRA jacks, allowing easy insertion and removal.

[0014] As an example, the amplifier module 100 is disposed on the underside of the roof of the vehicle 1, more specifically, as an example, between a roof panel of the body of the vehicle 1 and a ceiling panel on the interior side of the vehicle cabin. The amplifier module 100 has an antenna side terminal 101 and a main body side terminal 102. A cable 30A is connected to the antenna side terminal 101, and a cable 30B is connected to the main body side terminal 102.

[0015] The amplifier module 100 is disposed in a narrow space with limited size, such as between the roof panel of the vehicle 1 and the ceiling panel inside the vehicle cabin. For this reason, the amplifier module 100 and the antenna 10 are connected by a single cable 30A, and the amplifier module 100 and the main body 20 are also connected by a single cable 30B. This is because the space through which the cables 30A and 30B can pass is limited.

[0016] In the wireless communication system 200, power is supplied from the main body 20 to the amplifier module 100 through a single cable 30B, and communication signals are transmitted and received using cables 30A and 30B between the main body 20, the amplifier module 100, and the antenna 10. Furthermore, in the wireless communication system 200, an abnormality in the connection state of the antenna 10, etc. is notified to the main body 20 from the amplifier module 100 using cables 30A and 30B between the main body 20, the amplifier module 100, and the antenna 10.

[0017] The amplifier module 100 may be provided between (at the middle of) the antenna 10 and the main body 20, and may be located at a position between the antenna 10 and the main body 20 where the lengths of the cables 30A and 30B are equal. When the lengths of the cables 30A and 30B are equal, the amplifier module 100 is disposed at the midpoint of the length of the cables 30. Such an arrangement is preferable for improving the degree of freedom of installation of the amplifier module 100 in the vehicle interior space. In addition, in consideration of loss of a transmission signal and loss of a reception signal, it is preferable to make the cable 30A shorter than the cable 30B.

[0018] Furthermore, the amplifier module 100 does not necessarily have to be disposed at the midpoint of the length of the cable 30. The cable 30B may be shorter than the cable 30A, and the amplifier module 100 may be disposed inside the A-pillar.

[0019] Conversely, the cable 30A may be shorter than the cable 30B. In this case, the amplifier module 100 can be arranged closer to the antenna 10 than the point at which the distance from the antenna 10 and the main body 20 is equal in the path in which the cable 30 is arranged between the antenna 10 and the main body 20, and the signal level can be compensated for near the antenna 10. Normally, the signal level of the received signal is lower than that of the transmitted signal and is easily affected by electromagnetic noise, etc., so that by arranging the amplifier module 100 near the antenna 10, it becomes easier to suppress the influence of electromagnetic noise, etc. on the received signal. Therefore, such an arrangement is particularly suitable when it is desired to prioritize suppressing the influence of electromagnetic noise, etc. on the received signal.

[0020] The amplifier module 100 determines the connection state of the antenna 10 to the antenna side terminal 101 based on the impedance of the antenna side terminal 101 while being connected to the main body 20 via the cable 30B.

[0021] There are three examples of connection states of the antenna 10 to the antenna side terminal 101: The first is a state (normal connection state) in which the antenna 10 is normally connected to the antenna side terminal 101 via the cable 30A without any abnormality such as a short circuit in the cable 30A.

[0022] The second state is a state (open state) in which the antenna 10 and the cable 30A are not connected to the antenna side terminal 101 and the antenna side terminal 101 is open. The open state also occurs when the cable 30A is connected to the antenna side terminal 101 and the antenna 10 is disconnected from the cable 30A.

[0023] The third is a state (short state) in which a short circuit occurs between the antenna side terminal 101 and the ground potential point due to a reason such as connecting an antenna of a type different from the antenna 10 that should be connected to the cable 30A. Another example of a short state is when it is caused by moisture due to dust, condensation, or the like.

[0024] The open state and short state are states in which the connection state of the antenna 10 to the antenna side terminal 101 is abnormal.

[0025] When the amplifier module 100 is connected to the main body 20 via the cable 30B and determines the connection state of the antenna 10 to the antenna side terminal 101, if the connection state is abnormal, the amplifier module 100 causes the signal amplifier 110 to output a first state signal indicating the connection state to the main body side terminal 102. The first state signal output to the main body side terminal 102 is transmitted to the main body 20 via the cable 30B. The first state signal indicates whether the connection state of the antenna 10 to the antenna side terminal 101 is an open state or a short state. The main body 20 can detect that either the open state or the short state has occurred based on the first state signal. Details of the first state signal will be described later.

[0026] The amplifier module 100 has a temperature sensor that detects the temperature of the amplifier module 100, and determines whether or not a temperature abnormality has occurred in the amplifier module 100 based on the temperature detected by the temperature sensor. When the amplifier module 100 determines that a temperature abnormality has occurred, it causes the signal amplifier 110 to output a second state signal indicating the temperature abnormality to the main body side terminal 102 side. The second state signal output to the main body side terminal 102 side is transmitted to the main body unit 20 via the cable 30B. The second state signal indicates that the temperature of the amplifier module 100 is abnormal. Since the second state signal is different from the first state signal, the main body unit 20 can detect that a temperature abnormality has occurred in the amplifier module 100 based on the second state signal. The second state signal will be described in detail later.

[0027] The amplifier module 100 judges whether or not an abnormality occurs in the amount of current on the transmission side of the signal amplifier 110 based on the amount of current input from the main body side terminal 102. When an abnormality occurs in the amount of current, the amplifier module 100 causes the signal amplifier 110 to output a third state signal indicating an abnormality in the amount of current on the transmission side of the signal amplifier 110 to the main body side terminal 102 side. The third state signal output to the main body side terminal 102 side is transmitted to the main body part 20 via the cable 30B. The third state signal indicates that the amount of current supplied to the transmission side of the signal amplifier 110 of the amplifier module 100 from the cable 30B via the main body side terminal 102 is abnormal. Since the third state signal is different from the first state signal and the second state signal, the main body part 20 can detect that an abnormality occurs in the amount of current on the transmission side of the signal amplifier 110 based on the third state signal. Details of the third state signal will be described later.

[0028] 2A is a diagram showing an example of a circuit configuration of a wireless communication system 200. The wireless communication system 200 includes an antenna 10, an antenna board 10A, a main body 20, cables 30 (30A and 30B), and an amplifier module 100.

[0029] <Antenna 10> The antenna 10 is mounted on an antenna board 10A. The antenna board 10A is a wiring board conforming to the FR4 (Flame Retardant type 4) standard or the like. The antenna 10 is connected to a terminal 11 of the antenna board 10A. The antenna board 10A has the terminal 11 and a resistor 12. The terminal 11 is connected to a cable 30A, and is connected to an antenna side terminal 101 of the amplifier module 100 via the cable 30A.

[0030] The resistor 12 branches off from between the antenna 10 and the terminal 11 and is connected between the antenna 10 and the ground potential point. The resistor 12 is used to detect impedance when the amplifier module 100 determines the connection state of the antenna 10 with respect to the antenna side terminal 101.

[0031] <Main body 20> The main body 20 includes a terminal 20A, lines 21A and 21B, a filter circuit 22, a capacitor 23, a resistor 24, an ADC (Analog to Digital Converter) 1, an ADC 2, and a control unit 25.

[0032] The terminal 20A is connected to a cable 30B, and is connected to a main body side terminal 102 of the amplifier module 100 via the cable 30B. The terminal 20A is connected to a line 21A inside the main body 20. The terminal 20A outputs power and an RF (Radio Frequency) signal from the main body 20 to the amplifier module 100, and is a terminal through which the RF signal is input from the amplifier module 100. The RF signal is, for example, an RF signal for C-V2X communication.

[0033] Line 21A is a line that connects terminal 20A and control unit 25, and line 21B that branches off from line 21A is connected to terminal 20A, and capacitor 23 for blocking DC current is inserted in series between the branch point with line 21B and control unit 25.

[0034] The line 21B is a line that connects a branch point with the line 21A and a power source. A coil of a filter circuit 22 and a resistor 24 are inserted in series into the line 21B. The power source is a power source for the vehicle 1, and is connected to a battery, for example. The power source supplies DC power.

[0035] The filter circuit 22 is a low pass filter (LPF) and includes a coil and a capacitor. The coil is inserted in series into the line 21B, and the capacitor is connected between the coil and a ground potential point on the power supply side. The filter circuit 22 blocks noise contained in the DC power supplied from the power supply and outputs the power to the line 21A.

[0036] The resistor 24 is connected in series to the line 21B on the power supply side, and is provided for the amplifier module 100 to monitor the current of the main body part 20.

[0037] ADC1 and ADC2 are connected to both ends of resistor 24. ADC1 digitally converts the voltage on the power supply side of resistor 24 and outputs data representing the voltage value to control unit 25. ADC2 digitally converts the voltage on the filter circuit 22 side of resistor 24 and outputs data representing the voltage value to control unit 25. Control unit 25 obtains the amount of current flowing through line 21B using the voltage value input from ADC1 and the voltage value input from ADC2.

[0038] The control unit 25 is a control unit of the main body unit 20, and performs transmission and reception processing for the wireless communication system 200 to transmit and receive RF signals in C-V2X communication, for example. The control unit 25 also monitors the amount of current supplied from the main body unit 20 to the amplifier module 100, based on the difference in voltage values ​​input from ADC1 and ADC2. The difference in current values ​​is, for example, a difference obtained by subtracting the voltage value of ADC2 from the voltage value of ADC1. This is because the current flows in the direction from the power source toward the filter circuit 22.

[0039] <Amplifier module 100> The amplifier module 100 will be described with reference to Fig. 2B in addition to Fig. 2A. Fig. 2B is a diagram showing an example of the internal configuration of the amplifier module 100.

[0040] The amplifier module 100 includes an antenna side terminal 101, a main body side terminal 102, a line 103, a signal amplifier 110, an HPF (High Pass Filter) 120, an LPF (Low Pass Filter) 130, a power supply circuit 140, an impedance detection unit 150, an RF detector 160, a temperature sensor 170, and an MCU (Micro Controller Unit) 180. The signal amplifier 110 is an example of an amplifier unit.

[0041] <Antenna side terminal 101 and main body side terminal 102> The antenna side terminal 101 is connected to a cable 30A (see FIG. 2A) and is connected to the antenna 10 via the cable 30A. The main body side terminal 102 is connected to a cable 30B (see FIG. 2A) and is connected to the main body 20 via the cable 30B.

[0042] <Railway 103> The line 103 is a line that connects the antenna side terminal 101 and the main body side terminal 102 inside the amplifier module 100.

[0043] <Signal Amplifier 110> The signal amplifier 110 is inserted in series in the line 103. The signal amplifier 110 is, for example, an amplifier including a power amplifier (PA), a low noise amplifier (LNA), a switch (SW), and an attenuator (ATT).

[0044] The PA is an amplifier that amplifies a transmission RF signal output from the antenna side terminal 101 to the antenna 10. The LNA is an amplifier that amplifies an RF signal received by the antenna 10 and input from the antenna side terminal 101. The SW is a switch that switches between a transmission path including the PA and a reception path including the LNA. The ATT is an attenuator that adjusts the signal level of the transmission signal to maintain it at a level suitable for the communication standard.

[0045] The signal amplifier 110 is, for example, a front-end module configured with an IC (Integrated Circuit). The signal amplifier 110 is set to a normal state in which it performs normal operation by an enable signal (EN) input from the MCU 180, and is set to a sleep state by a disable signal (DEN) input from the MCU 180. The sleep state is a state in which the amplification operation of the signal amplifier 110 is disabled. When the signal amplifier 110 is not in the sleep state, the signal amplifier 110 is set to the normal state. The normal state is a state in which the signal amplifier 110 wakes up from the sleep state and the amplification operation of the signal amplifier 110 is enabled.

[0046] In the sleep state, the output from the signal amplifier 110 to the main body side terminal 102 side becomes a predetermined low level (hereinafter referred to as the L level). In the sleep state, the amplification operation of the signal amplifier 110 becomes invalid, and since the amplification operation of the LNA that amplifies the signal transmitted from the antenna side terminal 101 side to the main body side terminal 102 becomes invalid, the output level from the signal amplifier 110 to the main body side terminal 102 side becomes the L level.

[0047] Also, in the normal state, the output from the signal amplifier 110 to the main body side terminal 102 side becomes a predetermined high level (hereinafter referred to as the H level). The H level is higher than the L level. In the normal state, the amplification operation of the signal amplifier 110 becomes valid, and since the amplification operation of the LNA that amplifies the signal transmitted from the antenna side terminal 101 side to the main body side terminal 102 becomes valid, the output level from the signal amplifier 110 to the main body side terminal 102 side becomes the H level, which is higher than the L level. In the case of transmission, since the signal for transmission is input from the main body unit 20 side to the main body side terminal 102 from the main body unit 20, it becomes the H level.

[0048] Also, the signal amplifier 110 has a function of detecting the amount of current input from the main body side terminal 102 to the PA of the signal amplifier 110, and outputs a digital signal representing the detected amount of current to the MCU180.

[0049] <HPF120 and LPF130> The HPF120 is inserted in the line 103 between the main body side terminal 102 and the signal amplifier 110 inside the amplifier module 100. The LPF130 is inserted in the line branched from between the main body side terminal 102 and the HPF120 to the power supply circuit 140 inside the amplifier module 100.

[0050] The HPF 120 and the LPF 130 are provided to separate the RF signal and the DC power input from the main body side terminal 102. The RF signal input from the main body side terminal 102 passes through the HPF 120 and is transmitted to the signal amplifier 110, but does not pass through the LPF 130, so it is not supplied to the power supply circuit 140. The DC power input from the main body side terminal 102 is supplied to the power supply circuit 140 through the LPF 130, but does not pass through the HPF 120, so it is not transmitted to the signal amplifier 110.

[0051] <Power supply circuit 140> The power supply circuit 140 is connected to a line branched from the line 103 between the main body side terminal 102 and the HPF 120, and is connected to the main body side terminal 102 via the LPF 130. The power supply circuit 140 supplies DC power to the signal amplifier 110, the impedance detection unit 150, the RF detector 160, the temperature sensor 170, and the MCU 180 through a power supply line (not shown).

[0052] <Impedance detection unit 150> The impedance detection unit 150 is inserted into a line branched from the line 103 between the antenna side terminal 101 and the signal amplifier 110, and has an input terminal connected to the antenna side terminal 101 and an output terminal connected to the MCU 180.

[0053] The impedance detection unit 150 detects the impedance of the antenna side terminal 101 and outputs a digital signal representing the impedance to the MCU 180. The impedance of the antenna side terminal 101 detected by the impedance detection unit 150 varies depending on whether the connection state of the antenna 10 to the antenna side terminal 101 is in a normal state, an open state, or a short state.

[0054] <RF detector 160> RF detector 160 is connected to the line 103 at the output side of HPF 120. RF detector 160 has an input terminal connected to the output terminal of HPF 120, and an output terminal connected to signal amplifier 110 and MCU 180. RF detector 160 detects the RF signal output from HPF 120. When RF detector 160 detects an RF signal, it outputs a detection signal indicating the detection to signal amplifier 110 and MCU 180.

[0055] As a result, the signal amplifier 110 switches the SW to the transmission path in accordance with the detection signal, and the MCU 180 performs control for transmission (setting the gain of the PA, etc.) in accordance with the detection signal. When the detection signal is not input, the signal amplifier 110 switches the SW to the reception path, and the MCU 180 performs control for reception (setting the gain of the LNA, etc.) when the detection signal is not input.

[0056] <Temperature sensor 170> The temperature sensor 170 is provided, for example, in the housing of the amplifier module 100, and detects the temperature of the amplifier module 100. The temperature sensor 170 outputs a digital signal representing the detected temperature to the MCU 180. The temperature sensor 170 may be provided in the MCU 180.

[0057] <mcu180> The MCU 180 is realized by a computer including a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), an input / output interface, an internal bus, and the like.

[0058] MCU 180 has a determination unit 181 and a control unit 182. Determination unit 181 and control unit 182 are shown as functional blocks of functions of a program executed by MCU 180. MCU 180 has functional processing units and memories other than determination unit 181 and control unit 182, but these are omitted in Fig. 2B. The memory of MCU 180 is a memory realized by a RAM, a ROM, or the like.

[0059] <Judgment section 181> Based on the impedance detected by the impedance detection unit 150, the determination unit 181 determines the connection state of the antenna 10 to the antenna side terminal 101 (normal state, open state, or short state).

[0060] Furthermore, the determination unit 181 determines whether or not a temperature abnormality has occurred in the amplifier module 100 based on the temperature detected by the temperature sensor 170. The determination unit 181 determines whether or not a temperature abnormality has occurred in the amplifier module 100 when the temperature indicated by the digital signal input from the temperature sensor 170 is equal to or higher than a predetermined threshold value.

[0061] Furthermore, the determination unit 181 determines whether or not an abnormality has occurred in the amount of current input from the main body side terminal 102 to the PA of the signal amplifier 110, based on the digital signal input from the signal amplifier 110. The abnormality in the amount of current input to the PA of the signal amplifier 110 is an abnormality in the amount of current on the transmission side of the signal amplifier 110.

[0062] <Control unit 182> When the determining section 181 determines that the connection state is abnormal, the control section 182 causes the signal amplifier 110 to output a first state signal indicative of the connection state from the main body side terminal 102 to the cable 30B.

[0063] The control unit 182 outputs a control signal for controlling the amplification factor and the like of the PA and LNA of the signal amplifier 110. In addition, the control unit 182 switches an enable signal (EN) and a disable signal (DEN) output to the signal amplifier 110 in a time-division manner to switch between enabling and disabling the amplification operation of the signal amplifier 110, thereby causing the signal amplifier 110 to output a first state signal.

[0064] More specifically, the control unit 182 changes a first period during which an enable signal is output to the signal amplifier 110 and a second period during which a disable signal is output to the signal amplifier 110 according to the type of abnormality in the connection state, thereby causing the signal amplifier 110 to output a first state signal indicating the type of abnormality. The details of this will be described later with reference to FIG.

[0065] The types of abnormality include an open connection state of the antenna 10 to the antenna side terminal 101 and a short connection state of the antenna 10 to the antenna side terminal 101.

[0066] Furthermore, when the determining section 181 determines that a temperature abnormality has occurred, the control section 182 causes the signal amplifier 110 to output a second state signal indicative of a temperature abnormality to the main body side terminal 102 side.

[0067] In addition, when the judgment unit 181 judges that there is an abnormality in the amount of current input from the main body side terminal 102 to the PA of the signal amplifier 110, the control unit 182 causes the signal amplifier 110 to output a third status signal indicating the abnormality in the amount of current of the signal amplifier 110 to the main body side terminal 102 side.

[0068] The first state signal, the second state signal, and the third state signal that the control unit 182 causes the signal amplifier 110 to output are output signals that are output from the signal amplifier 110 to the main body side terminal 102, and the signal levels are switched between H level and L level in a time-division manner by the control unit 182 switching between an enable signal and a disable signal in a time-division manner and outputting them to the signal amplifier 110.

[0069] The patterns in which the signal levels of the first state signal, the second state signal, and the third state signal are switched to H level and L level in a time-division manner are all different. Also, the pattern in which the signal level of the first state signal is switched to H level and L level in a time-division manner is different between the short state and the open state. This will be described in detail later with reference to FIG. 3.

[0070] <First status signal, second status signal, and third status signal> 3 is a diagram showing an example of the first, second, and third status signals. As an example, the status signals used by the amplifier module 100 are the first status signal indicating an open state, the first status signal indicating a short state, the second status signal indicating an abnormal temperature state, and the third status signal indicating an abnormal current state.

[0071] 3 shows an example of the order of L level and H level and duration of each level in the first state signal of the open state, the first state signal of the short state, the second state signal of the abnormal temperature state, and the third state signal of the abnormal current state. The L level in each state signal is an example of the first signal level, and the H level in each state signal is an example of the second signal level. Furthermore, the period of the L level in each state signal is an example of the first period, and the period of the H level in each state signal is an example of the second period.

[0072] <First status signal in open state> The first state signal in the open state is, for example, a signal that alternates between an L level and an H level every second. Such a first state signal in the open state is output from the signal amplifier 110 to the main body side terminal 102 by the control unit 182 outputting a disable signal and an enable signal alternately every second. In this way, the first state signal in the open state has a first period and a second period according to the open state. For this reason, it is possible to notify the control unit 25 of the main body unit 20 that an open state has occurred.

[0073] <First status signal in short state> The first state signal in the short state is, for example, a signal that alternates between an L level and an H level every two seconds. Such a first state signal in the short state is output from the signal amplifier 110 to the main body side terminal 102 by the control unit 182 outputting a disable signal and an enable signal alternately every two seconds. In this way, the first state signal in the short state has a first period and a second period according to the short state. Therefore, it is possible to notify the control unit 25 of the main body unit 20 that a short state has occurred.

[0074] <Second status signal> As an example, the second state signal is a signal that alternates between an L level and an H level every three seconds. Such a second state signal is output from the signal amplifier 110 to the main body side terminal 102 by the control unit 182 outputting a disable signal and an enable signal alternately every three seconds. In this way, the second state signal has a first period and a second period according to the temperature abnormality. Therefore, it is possible to notify the control unit 25 of the main body unit 20 that an abnormal temperature state has occurred.

[0075] <Third status signal> As an example, the third state signal is a signal that alternates between an L level and an H level every four seconds. Such a third state signal is output from the signal amplifier 110 to the main body side terminal 102 by the control unit 182 outputting a disable signal and an enable signal alternately every four seconds. In this way, the third state signal has a first period and a second period according to an abnormality in the amount of current on the transmission side of the signal amplifier 110. Therefore, it is possible to notify the control unit 25 of the main body unit 20 that an abnormal current state has occurred.

[0076] In addition, the first state signal of the open state, the first state signal of the short state, the second state signal of the abnormal temperature state, and the third state signal of the abnormal current state may last for approximately 10 to 20 seconds, for example.

[0077] In this manner, by using a first state signal for an open state, a first state signal for a short state, a second state signal for an abnormal temperature state, and a third state signal for an abnormal current state, which have different durations of the L level and H level, the type of abnormality can be notified from the amplifier module 100 to the main body unit 20 via the cable 30B.

[0078] 3 shows four status signals as an example, the first status signal for an open state, the first status signal for a short state, the second status signal for an abnormal temperature state, and the third status signal for an abnormal current state, but a status signal for notifying the main body unit 20 of an abnormality other than these may be added or may be used instead of the above-mentioned four status signals. By changing the combination of the first period and the second period, it is possible to notify the main body unit 20 of various abnormalities, etc.

[0079] 3 shows a signal pattern in which the L level period and the H level period are equal in each state signal, but the L level period and the H level period in at least one state signal do not have to be equal. For example, the first state signal in the open state may alternate between an L level for 1 second and an H level for 2 seconds.

[0080] 3 shows a signal pattern in which the L level period and the H level period are repeated in the same period in each state signal, but the L level period and the H level period may be repeated in different periods in at least one state signal. For example, the first state signal in the open state may alternate between the L level and the H level for one second, and then alternate between the L level and the H level for two seconds.

[0081] Furthermore, if the amplifier module 100 does not include the temperature sensor 170, the control unit 182 does not alternately output the disable signal and the enable signal in a pattern for causing the signal amplifier 110 to generate the second state signal.

[0082] Furthermore, when the amplifier module 100 does not detect an abnormality in the current, the control unit 182 does not alternately output the disable signal and the enable signal in a pattern for causing the signal amplifier 110 to generate the third state signal.

[0083] <Flowchart> 4 is a flowchart showing an example of processing executed by the MCU 180. When the processing starts, the MCU 180 performs the following processing.

[0084] The determining unit 181 determines whether or not an open state occurs based on the digital signal input from the impedance detecting unit 150 (step S1).

[0085] When the determination unit 181 determines that an open state has occurred (S1: YES), the control unit 182 alternately switches between a disable signal and an enable signal in a pattern corresponding to the open state and outputs the switched-on signal to the signal amplifier 110 (step S1A). When the MCU 180 finishes the process of step S1A, it ends the series of processes (end).

[0086] Furthermore, when the determination unit 181 determines in step S1 that an open state has not occurred (S1: NO), it determines whether a short state has occurred based on the digital signal input from the impedance detection unit 150 (step S2).

[0087] When the determination unit 181 determines that a short circuit state has occurred (S2: YES), the control unit 182 alternately switches between a disable signal and an enable signal in a pattern corresponding to the short circuit state and outputs the signals to the signal amplifier 110 (step S2A). When the MCU 180 finishes the process of step S2A, it ends the series of processes (end).

[0088] Furthermore, if it is determined in step S2 that a short circuit state has not occurred (S2: NO), the determination unit 181 determines whether or not an abnormal temperature state has occurred based on the digital signal input from the temperature sensor 170 (step S3).

[0089] When the determination unit 181 determines that an abnormal temperature state has occurred (S3: YES), the control unit 182 alternately switches between a disable signal and an enable signal in a pattern corresponding to the abnormal temperature state and outputs the signals to the signal amplifier 110 (step S3A). When the MCU 180 finishes the process of step S3A, it ends the series of processes (end).

[0090] Furthermore, if the judgment unit 181 judges in step S3 that an abnormal temperature state has not occurred (S3: NO), it judges whether an abnormal current state has occurred based on the digital signal input from the signal amplifier 110 (step S4).

[0091] When the determination unit 181 determines that an abnormal current state has occurred (S4: YES), the control unit 182 alternately switches between a disable signal and an enable signal in a pattern according to the abnormal current state and outputs the signals to the signal amplifier 110 (step S4A). When the MCU 180 finishes the process of step S4A, it ends the series of processes (end).

[0092] Furthermore, if the determination unit 181 determines in step S4 that an abnormal current state has not occurred (S4: NO), the determination unit 181 ends the series of processes (END).

[0093] <Wireless communication system 200M according to a modified embodiment> FIG. 5 is a diagram showing an example of a circuit configuration of a wireless communication system 200M according to a modified example of the embodiment.

[0094] The wireless communication system 200M includes an antenna 10, an antenna board 10MA, a main body 20, a cable 30B, and an amplifier module 100. In the wireless communication system 200M, the antenna 10 and the amplifier module 100 are mounted on the antenna board 10MA. The antenna board 10MA has a terminal 11 and a resistor 12, and is a wiring board similar to the antenna board 10A shown in FIG. 2A.

[0095] 2A is mounted on an antenna substrate 10MA, and the amplifier module 100 and the antenna 10 are connected by a wiring 30MA. The wiring 30MA is an example of a first wiring member, and the cable 30B is an example of a second wiring member.

[0096] In this way, a wireless communication system 200M having a configuration in which an amplifier module 100 is mounted on an antenna substrate 10MA and the amplifier module 100 and antenna 10 are connected by wiring 30MA can operate in the same manner as the wireless communication system 200 shown in Figure 2A and has the same effects.

[0097] <Effects> The amplifier module 100 is disposed between an antenna 10 for wireless communication and a main body 20 of the wireless communication device, and is connected to the antenna 10 via a cable 30A (first wiring member) and to the main body 20 via a cable 30B (second wiring member). The amplifier module 100 includes an antenna side terminal 101 to which the cable 30A is connected, a main body side terminal 102 to which the cable 30B is connected, a signal amplifier 110 (amplification unit) provided between the antenna side terminal 101 and the main body side terminal 102, an impedance detection unit 150 that detects the impedance of the antenna side terminal 101, a determination unit 181 that determines the connection state of the antenna 10 to the antenna side terminal 101 based on the impedance detected by the impedance detection unit 150, and a control unit 182 that causes the signal amplifier 110 to output a first state signal representing the connection state to the main body side terminal 102 side when the determination unit 181 determines that the connection state is abnormal. In this manner, the connection state of the antenna 10 can be notified to the main unit 20 by having the signal amplifier 110 output the first status signal indicating the connection state of the antenna 10 to the main body side terminal 102. Since the signal amplifier 110 outputs the first status signal to the main body side terminal 102, there is no need to add a circuit for generating the first status signal.

[0098] Therefore, it is possible to provide an amplifier module 100 with a simple configuration that can notify the main body unit 20 of the connection state of the antenna 10. Under the constraint that the amplifier module 100 and the antenna 10 are connected by one cable 30A and that the amplifier module 100 and the main body unit 20 are also connected by one cable 30B, it is possible to notify the main body unit 20 of the connection state of the antenna 10 with a simple configuration that does not require any additional circuitry.

[0099] Furthermore, the signal amplifier 110 is configured to be able to switch between enabling and disabling the amplification operation by a disable signal and an enable signal, and the control unit 182 may cause the signal amplifier 110 to output a first state signal by switching between enabling and disabling the amplification operation of the signal amplifier 110 by switching between enabling and disabling the disable signal and enable signal output to the signal amplifier 110 in a time-division manner. Therefore, it is possible to provide an amplifier module 100 with a simple configuration that can output a first state signal constituted by the output signal of the main body side terminal 102 in the enabling state and disabling state of the amplification operation of the signal amplifier 110 and can notify the main body unit 20 of the connection state of the antenna 10 by the first state signal that can be easily output.

[0100] Furthermore, the control unit 182 may change a first period during which a disable signal is output to the signal amplifier 110 and a second period during which an enable signal is output to the signal amplifier 110 according to the type of abnormality in the connection state, thereby causing the signal amplifier 110 to output a first status signal indicating the type of abnormality. By changing the first period and the second period according to the type of abnormality in the connection state, it is possible to easily output the first status signal indicating the type of abnormality.

[0101] Furthermore, the first period and the second period may be equal to each other. By making the first period and the second period equal to each other, the type of abnormality can be represented by a simpler first status signal.

[0102] Furthermore, the control unit 182 may alternately switch the disable signal and enable signal output to the signal amplifier 110 each time the first period and the second period alternate, and the first state signal may be a signal in which a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period are alternately switched. The type of abnormality can be represented by the first state signal in which the first signal level over the first period and the second signal level over the second period are alternately switched.

[0103] The type of abnormality may include an open connection state of the antenna 10 to the antenna side terminal 101 and a short connection state of the antenna 10 to the antenna side terminal 101. The open state and short state of the antenna 10 can be notified to the main body unit 20 by a first state signal representing the open state and short state of the antenna 10.

[0104] The amplifier module 100 may further include a temperature sensor 170 for detecting the temperature of the amplifier module 100, and the determination unit 181 may further determine whether or not a temperature abnormality occurs in the amplifier module 100 based on the temperature detected by the temperature sensor 170. When the determination unit 181 determines that a temperature abnormality occurs, the control unit 182 may cause the signal amplifier 110 to output a second state signal representing the temperature abnormality to the main body side terminal 102 side. In this way, the temperature abnormality state of the amplifier module 100 can be notified to the main body unit 20 by causing the signal amplifier 110 to output a second state signal representing the temperature abnormality state of the amplifier module 100 to the main body side terminal 102 side. Since the signal amplifier 110 outputs the second state signal to the main body side terminal 102 side, it is not necessary to add a circuit for generating the second state signal. Therefore, it is possible to provide an amplifier module 100 with a simple configuration that can notify the main body unit 20 of the temperature abnormality of the amplifier module 100 in addition to the connection state of the antenna 10.

[0105] The amplifier module 100 further includes a temperature sensor 170 for detecting the temperature of the amplifier module 100, and the determination unit 181 further determines whether or not a temperature abnormality has occurred in the amplifier module 100 based on the temperature detected by the temperature sensor 170. When the determination unit 181 determines that a temperature abnormality has occurred, the control unit 182 switches the disable signal and the enable signal in a time-division manner to switch between enable and disable of the amplification operation of the signal amplifier 110, thereby causing the signal amplifier 110 to output a second state signal representing the temperature abnormality to the main body side terminal 102 side, and the second state signal has a first period and a second period according to the temperature abnormality, and the first period and the second period of the second state signal may be different from the first period and the second period of the first state signal. Therefore, the second state signal consisting of the output signal of the main body side terminal 102 in the enable state and the disable state of the amplification operation of the signal amplifier 110 can be output, and the amplifier module 100 can be provided with a simple configuration that can notify the main body unit 20 of the temperature abnormality of the amplifier module 100 by the easily output second state signal. In addition, by changing the first period and the second period depending on the temperature abnormality of the amplifier module 100 and the abnormality in the connection state of the antenna 10, it is possible to easily output a second status signal indicating a temperature abnormality of the amplifier module 100 and a first status signal indicating an abnormality in the connection state of the antenna 10.

[0106] Furthermore, the control unit 182 may alternately switch the disable signal and the enable signal output to the signal amplifier 110 each time the first period and the second period alternate, and the second state signal may be a signal in which a first signal level corresponding to the disable signal for the first period and a second signal level corresponding to the enable signal for the second period are alternately switched. A temperature abnormality in the amplifier module 100 can be represented by the second state signal in which the first signal level for the first period and the second signal level for the second period are alternately switched.

[0107] Furthermore, the determination unit 181 may further determine whether an abnormality in the amount of current occurs based on the amount of current input from the main body side terminal 102 to the signal amplifier 110, and when the determination unit 181 determines that an abnormality in the amount of current occurs, the control unit 182 may cause the signal amplifier 110 to output a third state signal indicating the abnormality in the amount of current to the main body side terminal 102 side. In this way, by causing the signal amplifier 110 to output the third state signal indicating the abnormal state of the amount of current to the main body side terminal 102 side, the abnormal state of the amount of current can be notified to the main body unit 20. Since the signal amplifier 110 outputs the third state signal to the main body side terminal 102 side, it is not necessary to add a circuit that generates the third state signal. Therefore, it is possible to provide an amplifier module 100 with a simple configuration that can notify the main body unit 20 of an abnormality in the amount of current of the signal amplifier 110 in addition to the connection state of the antenna 10.

[0108] The determination unit 181 further determines whether an abnormality in the amount of current has occurred based on the amount of current input from the main body side terminal 102 to the signal amplifier 110, and when the determination unit 181 determines that an abnormality in the amount of current has occurred, the control unit 182 switches the disable signal and the enable signal in a time-division manner to switch between enable and disable of the amplification operation of the signal amplifier 110, thereby causing the signal amplifier 110 to output a third state signal indicating the abnormality in the amount of current to the main body side terminal 102 side, and the third state signal has a first period and a second period according to the abnormality in the amount of current, and the first period and the second period of the third state signal may be different from the first period and the second period of the first state signal. Therefore, it is possible to provide an amplifier module 100 that can output a third state signal constituted by the output signal of the main body side terminal 102 in the enable state and the disable state of the amplification operation of the signal amplifier 110, and can notify the main body unit 20 of the abnormality in the amount of current by the third state signal that can be easily output, and has a simple configuration. In addition, by changing the first period and the second period according to an abnormality in the amount of current in the signal amplifier 110 and an abnormality in the connection state of the antenna 10, it is possible to easily output a third status signal indicating an abnormality in the amount of current in the signal amplifier 110 and a first status signal indicating an abnormality in the connection state of the antenna 10.

[0109] The control unit 182 may alternately switch the disable signal and enable signal output to the signal amplifier 110 each time the first period and the second period alternately pass, and the third state signal may be a signal in which a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period are alternately switched. An abnormality in the amount of current in the signal amplifier 110 can be indicated by the third state signal in which the first signal level over the first period and the second signal level over the second period are alternately switched.

[0110] The wireless communication system 200 includes an antenna 10 for wireless communication, a main body 20 of the wireless communication device, a cable 30A connected to the antenna 10, a cable 30B connected to the main body 20, and an amplifier module 100 arranged between the antenna 10 and the main body 20 and connected to the antenna 10 via the cable 30A and to the main body 20 via the cable 30B. The amplifier module 100 includes an antenna side terminal 101 to which the cable 30A is connected, a main body side terminal 102 to which the cable 30B is connected, a signal amplifier 110 provided between the antenna side terminal 101 and the main body side terminal 102, an impedance detection unit 150 that detects the impedance of the antenna side terminal 101, a determination unit 181 that determines the connection state of the antenna 10 with respect to the antenna side terminal 101 based on the impedance detected by the impedance detection unit 150, and a control unit 182 that causes the signal amplifier 110 to output a first state signal representing the connection state to the main body side terminal 102 side when the determination unit 181 determines that the connection state is abnormal. In this manner, the connection state of the antenna 10 can be notified to the main unit 20 by having the signal amplifier 110 output the first status signal indicating the connection state of the antenna 10 to the main body side terminal 102. Since the signal amplifier 110 outputs the first status signal to the main body side terminal 102, there is no need to add a circuit for generating the first status signal.

[0111] Therefore, it is possible to provide a wireless communication system 200 that is capable of notifying the main body unit of the connection state of the antenna 10 and has a simple configuration.

[0112] The above describes an amplifier module and a wireless communication system according to exemplary embodiments of the present invention. However, the present invention is not limited to the specifically disclosed embodiments, and various modifications and changes are possible without departing from the scope of the claims.

[0113] Regarding the above embodiment, the following supplementary notes are further disclosed. (Appendix 1) An amplifier module is disposed between an antenna for wireless communication and a main body of a wireless communication device, and is connected to the antenna via a first wiring member and to the main body via a second wiring member, an antenna side terminal to which the first wiring member is connected; a main body side terminal to which the second wiring member is connected; an amplifier provided between the antenna terminal and the main body terminal; an impedance detection unit that detects the impedance of the antenna side terminal; a determination unit that determines a connection state of the antenna to the antenna side terminal based on the impedance detected by the impedance detection unit; a control unit that, when the determination unit determines that the connection state is abnormal, causes the amplifier to output a first state signal representing the connection state to the main body side terminal; Including the amplifier module. (Appendix 2) the amplifier is configured to be able to switch between enabling and disabling an amplification operation by a disable signal and an enable signal; The amplifier module described in Appendix 1, wherein the control unit causes the amplifier to output the first state signal by switching the disable signal and the enable signal output to the amplifier in a time-division manner to enable and disable the amplification operation of the amplifier. (Appendix 3) The amplifier module described in Appendix 2, wherein the control unit causes the amplifier to output the first state signal indicating the type of abnormality by changing a first period during which the disable signal is output to the amplifier and a second period during which the enable signal is output to the amplifier according to the type of abnormality in the connection state. (Appendix 4) 4. The amplifier module of claim 3, wherein the first period and the second period are equal. (Appendix 5) the control unit alternates between the disable signal and the enable signal to be output to the amplifier each time the first period and the second period alternately elapse; The amplifier module described in Appendix 3, wherein the first state signal is a signal that alternates between a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period. (Appendix 6) The amplifier module of claim 3, wherein the types of abnormality include an open connection state of the antenna to the antenna side terminal and a short connection state of the antenna to the antenna side terminal. (Appendix 7) Further comprising a temperature sensor for detecting a temperature of the amplifier module; The determination unit further determines whether or not a temperature abnormality has occurred in the amplifier module based on the temperature detected by the temperature sensor, The control unit, when the judgment unit judges that the temperature abnormality has occurred, causes the amplifier to output a second state signal indicating the temperature abnormality to the main body side terminal side. (Appendix 8) Further comprising a temperature sensor for detecting a temperature of the amplifier module; The determination unit further determines whether or not a temperature abnormality has occurred in the amplifier module based on the temperature detected by the temperature sensor, when the determination unit determines that the temperature abnormality has occurred, the control unit switches the disable signal and the enable signal in a time-division manner to enable and disable the amplification operation of the amplifier, thereby causing the amplifier to output a second state signal representing the temperature abnormality to the main body side terminal side; the second status signal has the first period and the second period corresponding to the temperature abnormality, 7. The amplifier module according to claim 3, wherein the first period and the second period of the second state signal are different from the first period and the second period of the first state signal. (Appendix 9) the control unit alternates between the disable signal and the enable signal to be output to the amplifier each time the first period and the second period alternately elapse; 9. The amplifier module of claim 8, wherein the second state signal is a signal that alternates between a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period. (Appendix 10) The determination unit further determines whether or not an abnormality occurs in the amount of current based on the amount of current input from the main body side terminal to the amplifier, The control unit, when the judgment unit judges that an abnormality has occurred in the amount of current, causes the amplifier to output a third state signal indicating the abnormality in the amount of current to the main body side terminal. (Appendix 11) The determination unit further determines whether or not an abnormality occurs in the amount of current based on the amount of current input from the main body side terminal to the amplifier, when the determination unit determines that an abnormality has occurred in the amount of current, the control unit switches between the disable signal and the enable signal in a time-division manner to enable and disable the amplifying operation of the amplifier, thereby causing the amplifier to output a third state signal indicating the abnormality in the amount of current to the main body side terminal side; the third state signal has the first period and the second period corresponding to the abnormality in the amount of current, 10. The amplifier module according to claim 3, wherein the first period and the second period of the third state signal are different from the first period and the second period of the first state signal. (Appendix 12) the control unit alternates between the disable signal and the enable signal to be output to the amplifier each time the first period and the second period alternately elapse; 12. The amplifier module of claim 11, wherein the third state signal is a signal that alternates between a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period. (Appendix 13) An antenna for wireless communication; A main body of a wireless communication device; A first wiring member connected to the antenna; A second wiring member connected to the main body portion; an amplifier module disposed between the antenna and the main body, connected to the antenna via a first wiring member and connected to the main body via a second wiring member; Including, The amplifier module includes: an antenna side terminal to which the first wiring member is connected; a main body side terminal to which the second wiring member is connected; an amplifier provided between the antenna terminal and the main body terminal; an impedance detection unit that detects the impedance of the antenna side terminal; a determination unit that determines a connection state of the antenna to the antenna side terminal based on the impedance detected by the impedance detection unit; a control unit that, when the determination unit determines that the connection state is abnormal, causes the amplifier to output a first state signal representing the connection state to the main body side terminal; A wireless communication system comprising: [Explanation of symbols]

[0114] 10 Antennas 20 Main body 20A Terminal 25 Control Unit 30, 30A, 30B Cables (cable 30A is an example of a first wiring member, and cable 30B is an example of a second wiring member) 30MA wiring (an example of the first wiring component) 100 Amplifier Module 101 Antenna side terminal 102 Main unit terminal 110 Signal amplifier (an example of an amplifier) 120 HPF 130 LPF 140 Power supply circuit 150 Impedance detection unit 160 RF Detector 170 Temperature Sensor 180 MCU 181 Judgment Department 182 Control section 200, 200M wireless communication system

Claims

1. An amplifier module is disposed between an antenna for wireless communication and a main body of a wireless communication device, and is connected to the antenna via a first wiring member and to the main body via a second wiring member, an antenna side terminal to which the first wiring member is connected; a main body side terminal to which the second wiring member is connected; an amplifier provided between the antenna terminal and the main body terminal; an impedance detection unit that detects the impedance of the antenna side terminal; a determination unit that determines a connection state of the antenna to the antenna side terminal based on the impedance detected by the impedance detection unit; a control unit that, when the determination unit determines that the connection state is abnormal, causes the amplifier to output a first state signal representing the connection state to the main body side terminal; Including the amplifier module.

2. the amplifier is configured to be able to switch between enabling and disabling an amplification operation by a disable signal and an enable signal; 2. The amplifier module according to claim 1, wherein the control unit causes the amplifier to output the first state signal by switching the disable signal and the enable signal output to the amplifier in a time-division manner to enable and disable the amplification operation of the amplifier.

3. 3. The amplifier module of claim 2, wherein the control unit causes the amplifier to output the first state signal representing the type of abnormality by changing a first period during which the disable signal is output to the amplifier and a second period during which the enable signal is output to the amplifier according to the type of abnormality in the connection state.

4. The amplifier module of claim 3 , wherein the first period and the second period are equal.

5. the control unit alternates between the disable signal and the enable signal to be output to the amplifier each time the first period and the second period alternately elapse; 4. The amplifier module of claim 3, wherein the first state signal is a signal that alternates between a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period.

6. The amplifier module according to claim 3 , wherein the types of abnormality include an open connection state of the antenna to the antenna side terminal and a short connection state of the antenna to the antenna side terminal.

7. Further comprising a temperature sensor for detecting a temperature of the amplifier module; The determination unit further determines whether or not a temperature abnormality has occurred in the amplifier module based on the temperature detected by the temperature sensor, The amplifier module according to claim 1 , wherein the control unit, when it is determined by the determination unit that the temperature abnormality has occurred, causes the amplifier to output a second state signal representing the temperature abnormality to the main body side terminal side.

8. Further comprising a temperature sensor for detecting a temperature of the amplifier module; The determination unit further determines whether or not a temperature abnormality has occurred in the amplifier module based on the temperature detected by the temperature sensor, when the determination unit determines that the temperature abnormality has occurred, the control unit switches the disable signal and the enable signal in a time division manner to enable and disable the amplification operation of the amplifier, thereby causing the amplifier to output a second state signal representing the temperature abnormality to the main body side terminal side; the second status signal has the first period and the second period corresponding to the temperature abnormality, The amplifier module of claim 3 , wherein the first period and the second period of the second state signal are different from the first period and the second period of the first state signal.

9. the control unit alternates between the disable signal and the enable signal to be output to the amplifier each time the first period and the second period alternately elapse; 9. The amplifier module of claim 8, wherein the second state signal is a signal that alternates between a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period.

10. The determination unit further determines whether or not an abnormality occurs in the amount of current based on the amount of current input from the main body side terminal to the amplifier, The amplifier module according to claim 1 , wherein the control unit, when the determination unit determines that an abnormality has occurred in the amount of current, causes the amplifier to output a third state signal indicating the abnormality in the amount of current to the main body side terminal side.

11. The determination unit further determines whether or not an abnormality occurs in the amount of current based on the amount of current input from the main body side terminal to the amplifier, when the determination unit determines that an abnormality has occurred in the amount of current, the control unit switches between the disable signal and the enable signal in a time-division manner to enable and disable the amplifying operation of the amplifier, thereby causing the amplifier to output a third state signal indicating the abnormality in the amount of current to the main body side terminal; the third state signal has the first period and the second period corresponding to the abnormality in the amount of current, The amplifier module of claim 3 , wherein the first period and the second period of the third state signal are different from the first period and the second period of the first state signal.

12. the control unit alternates between the disable signal and the enable signal to be output to the amplifier each time the first period and the second period alternately elapse; 12. The amplifier module of claim 11, wherein the third state signal is a signal that alternates between a first signal level corresponding to the disable signal over the first period and a second signal level corresponding to the enable signal over the second period.

13. An antenna for wireless communication; A main body of a wireless communication device; A first wiring member connected to the antenna; A second wiring member connected to the main body portion; an amplifier module disposed between the antenna and the main body, connected to the antenna via a first wiring member and connected to the main body via a second wiring member; Including, The amplifier module includes: an antenna side terminal to which the first wiring member is connected; a main body side terminal to which the second wiring member is connected; an amplifier provided between the antenna terminal and the main body terminal; an impedance detection unit that detects the impedance of the antenna side terminal; a determination unit that determines a connection state of the antenna to the antenna side terminal based on the impedance detected by the impedance detection unit; a control unit that, when the determination unit determines that the connection state is abnormal, causes the amplifier to output a first state signal representing the connection state to the main body side terminal; A wireless communication system comprising:

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