JP2007049625A - Communication signal path control circuit and radio communication device equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve convenience such that, while radio communication with a radio communication partner is carried out in a continuous connection state, other radio communication is performed simultaneously. <P>SOLUTION: A communication signal path control circuit is equipped with an antenna-side signal conduction path 11 connected to an antenna which corresponds to a plurality of radio communication systems in common and can perform radio communication, signal conduction paths 8 (8A to 8D) on sides of a plurality of signal processing circuits connected respectively to the signal processing circuits 3 by the plurality of radio communication systems provided to a radio communication device, and a switch means 6 for switching and connecting the antenna-side signal conduction path 11 to one of the signal conduction paths 8 (8A to 8D) on the plurality of signal processing circuit sides. A main line of a directional coupler 14 having the main line and a sub-line electromagnetically coupled with each other is interposed in at least one of the signal conduction paths 8 (8A to 8D) on the plurality of signal processing circuit sides. The sub-line of the directional coupler 14 is connected to a signal conduction path 15 for guiding a signal transmitted from the main line through electromagnetic coupling to signal conduction lines 8 on other signal processing circuit sides. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication signal path control circuit provided in a wireless communication apparatus such as a portable telephone and a wireless communication apparatus including the communication signal path control circuit.

  FIG. 5 simply shows an example of a communication signal path control circuit of a wireless communication device (see, for example, Patent Document 1). The communication signal path control circuit 20 includes a plurality of wireless communication systems (in this example, W-CDMA (Wideband-Code-Division-Multiple-Access), DCS (Digital-Cellular-System), and GSM (Global-System). -for-Mobile-Communication-System) is provided in a wireless communication apparatus (for example, a mobile phone) that can support three wireless communication systems). The communication signal path control circuit 20 includes an antenna 21 that can wirelessly communicate communication signals of all the wireless communication systems, and a plurality of signal processing circuits 22 (22A to 22C) provided for each wireless communication system. It is a circuit interposed on the signal conduction path between. The communication signal path control circuit 20 supplies a signal received by the antenna 21 to a signal processing circuit 22 (22A, 22B, 22C) of an appropriate wireless communication system that matches the received signal, This is a circuit for controlling the path of a communication signal for supplying a radio transmission signal output from the signal processing circuit 22 (22A, 22B, 22C) to the antenna 21. In this example, the communication signal path control circuit 20 includes a high pass filter (HPF) 25, a low pass filter (LPF) 26, switch means 27 and 28, and a duplexer 29.

  In the configuration example of the communication signal path control circuit 20, one end sides of the signal conduction paths of the HPF 25 and the LPF 26 are connected to the antenna 21 in common. The other end side of the signal conduction path of the HPF 25 is connected to the switch means 27 via the signal conduction path 30A, and the other end side of the signal conduction path of the LPF 26 is connected to the switch means 28 via the signal conduction path 30B. By the way, in W-CDMA, the frequency band of the reception signal received by the antenna 21 of the wireless communication apparatus is about 2110 MHz to 2170 MHz, and the frequency band of the transmission signal transmitted from the antenna 21 to the outside is about 1920 MHz to 1980 MHz. is there. In DCS, the frequency band of the received signal received by the antenna 21 of the wireless communication apparatus is about 1805 MHz to 1880 MHz, and the frequency band of the transmission signal transmitted from the antenna 21 to the outside is about 1710 MHz to 1785 MHz. Further, in GSM, the frequency band of the reception signal received by the antenna 21 of the wireless communication apparatus is about 925 MHz to 960 MHz, and the frequency band of the transmission signal transmitted from the antenna 21 to the outside is about 880 MHz to 915 MHz.

  In the configuration example of the communication signal path control circuit 20, the HPF 25 transmits, for example, W-CDMA and DCS reception signals out of signals received by the antenna 21 and supplies them to the switch unit 27. Has a damping characteristic. For example, the LPF 26 transmits GSM reception signals among the signals received by the antenna 21 and supplies them to the switch means 28, but has a characteristic of attenuating W-CDMA and DCS reception signals.

The switch means 27 has a configuration in which the non-selection-side terminal 27M is switched and connected to any one of a plurality of selection-side terminals 27N _{1 to} 27N ₃ . The non-selection side terminal 27M is connected to the antenna side signal conduction path 30A, the selection side terminal 27N ₁ is connected to one end side of the signal processing circuit side signal conduction path 30c, and the selection side terminal 27N ₂ is a signal. is connected to one end of the processing circuit side of the signal conduction path 30d, terminals 27N ₃ selection side is connected to one end of the signal conducting path 30e of the signal processing circuit side. That is, the switch means 27 is configured to electrically switch and connect the signal conducting path 30A on the antenna side to any one of the signal conducting paths 30c, 30d, and 30e on the signal processing circuit side.

  The other end side of the signal conducting path 30c is connected to the reception signal input portion of the signal processing circuit 22A for W-CDMA via the duplexer 29 and the signal conducting path 30a, and via the duplexer 29 and the signal conducting path 30b. To the transmission signal output section of the W-CDMA signal processing circuit 22A. The duplexer 29 uses the frequency difference between the W-CDMA reception signal and the DCS reception signal to extract the W-CDMA reception signal from the reception signals supplied from the switch means 27 side. The reception signal is applied to the reception signal input unit of the signal processing circuit 22A for W-CDMA through the signal conducting path 30a. The duplexer 29 guides the transmission signal output from the transmission signal output unit of the W-CDMA signal processing circuit 22A and applied via the signal conduction path 30b to the signal conduction path 30c on the switch means 27 side. It has a circuit configuration.

  The other end of the signal conducting path 30d is connected to the transmission signal output unit of the DCS signal processing circuit 22B, and the other end of the signal conducting path 30e is connected to the reception signal input unit of the DCS signal processing circuit 22B. The Note that the difference in frequency between the W-CDMA reception signal and the DCS reception signal is used on the signal path from the switch means 27 to the DCS signal processing circuit 22B via the signal conducting path 30e. Filter means (not shown) such as a bandpass filter (BPF) for taking out the DCS received signal from the received signal supplied from the switch means 27 side is provided, and only the DCS received signal is inserted. Is supplied to the DCS signal processing circuit 22B.

The switch means 28 has a configuration in which the non-selection-side terminal 28M is switched and connected to one of the two selection-side terminals 28N ₁ and 28N ₂ . Its terminal 28M unselected side is connected to the signal conduction path 30B of the antenna side, the terminal 28N ₁ selection side is connected to one end of the signal conducting path 30f of the signal processing circuit side, the terminal 28N ₂ selective side signal It is connected to one end side of the signal conducting path 30g on the processing circuit side. In other words, the switch means 28 is configured to electrically switch and connect the signal conducting path 30B on the antenna side to one of the signal conducting paths 30f and 30g on the signal processing circuit side. The other end side of the signal conducting path 30f is connected to the transmission signal output unit of the GSM signal processing circuit 22C, and the other end side of the signal conducting path 30g is connected to the reception signal input unit of the GSM signal processing circuit 22C. Connected.

  The switching means 27 and 28 are those whose switching operation is controlled by a control device (not shown) that controls the device operation of the wireless communication device. For example, when a wireless communication device performs wireless communication in a W-CDMA wireless communication system, the control device of the wireless communication device switches the signal conduction path 30A on the antenna side to a signal conduction path 30c for W-CDMA. Thus, the switching operation of the switch means 27 is controlled. As a result, the W-CDMA reception signal received by the antenna 21 passes through the HPF 25 and passes through the signal conduction path 30A, the switch means 27, the signal conduction path 30c, the duplexer 29, and the signal conduction path 30a in this order. To the signal processing circuit 22A. The transmission signal output from the W-CDMA signal processing circuit 22A passes through the signal conducting path 30b, the duplexer 29, the signal conducting path 30c, the switch means 27, the signal conducting path 30A, and the HPF 25 in this order. And is transmitted wirelessly from the antenna 21 to the outside.

  When a wireless communication device performs a receiving operation in a DCS wireless communication system, the control device of the wireless communication device switches so that the signal conducting path 30A on the antenna side is switched and connected to the signal conducting path 30e on the signal processing circuit side. The switching operation of the means 27 is controlled. Thus, the DCS received signal received by the antenna 21 is supplied to the DCS signal processing circuit 22B through the HPF 25, the signal conducting path 30A, the switch means 27, and the signal conducting path 30e in this order. When the wireless communication device performs a transmission operation in the DCS wireless communication system, the control device of the wireless communication device switches and connects the signal conduction path 30A on the antenna side to the signal conduction path 30d on the signal processing circuit side. The switching operation of the switch means 27 is controlled. Thus, the transmission signal output from the DCS signal processing circuit 22B is guided to the antenna 21 through the signal conduction path 30d, the switch means 27, the signal conduction path 30A, and the HPF 25 in order, and is wirelessly transmitted from the antenna 21 to the outside. Sent.

  Further, when the wireless communication device performs a transmission operation in the GSM wireless communication system, the control device of the wireless communication device switches and connects the signal conducting path 30B on the antenna side to the signal conducting path 30f on the signal processing circuit side. The switching operation of the switch means 28 is controlled. As a result, the transmission signal output from the signal processing circuit 22C for GSM is guided to the antenna 21 through the signal conduction path 30f, the switch means 28, the signal conduction path 30B, and the LPF 26 in order, and wirelessly transmitted from the antenna 21 to the outside. Sent. Furthermore, when the wireless communication device performs a receiving operation in the GSM wireless communication system, the control device of the wireless communication device switches and connects the signal conducting path 30B on the antenna side to the signal conducting path 30g on the signal processing circuit side. Thus, the switching operation of the switch means 28 is controlled. As a result, the GSM received signal received by the antenna 21 is supplied to the GSM signal processing circuit 22C through the LPF 26, the signal conducting path 30B, the switch means 28, and the signal conducting path 30g in this order.

  As described above, the communication signal path control circuit 20 shown in FIG. 5 supplies the signal received by the antenna 21 to the signal processing circuit 22 suitable for the received signal, and the transmission signal output from the signal processing circuit 22. A configuration for guiding the trusted signal to the antenna 21 is provided.

International Publication No. 02/01741 Pamphlet

  By the way, in a W-CDMA wireless communication system, it is required to perform wireless communication while being always connected to a wireless communication partner. Further, it may be necessary to perform wireless communication of a DCS wireless communication system while performing wireless communication of a W-CDMA wireless communication system, for example.

  However, in the configuration shown in FIG. 5, only one of the signal processing circuit 22A for the W-CDMA radio communication system and the signal processing circuit 22B for the DCS radio communication system is switched by the switch means 27. The antenna 21 is electrically switched and connected. For this reason, the wireless communication of the DCS wireless communication system cannot be performed simultaneously with the wireless communication of the W-CDMA wireless communication system.

  The present invention has been made in order to solve the above-mentioned problems, and the object thereof is, for example, while performing wireless communication of a wireless communication system that needs to perform wireless communication in a constantly connected state with a wireless communication partner. An object of the present invention is to provide a communication signal path control circuit and a wireless communication apparatus including the communication signal path control circuit that can improve convenience so that wireless communication of a wireless communication system can be simultaneously performed.

In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, the communication signal path control circuit of the present invention is
A reception signal of an antenna capable of performing wireless communication commonly corresponding to a plurality of wireless communication systems is received from among the signal processing circuits for each of the plurality of wireless communication systems provided in the wireless communication device. A communication signal path control circuit that leads to a signal processing circuit for a wireless communication system that matches a signal, and that guides a transmission signal output from the signal processing circuit for the wireless communication system to an antenna,
A signal conducting path on the antenna side connected to the antenna;
A plurality of signal processing circuit side signal conduction paths respectively connected to signal processing circuits for each wireless communication system;
Switch means for switching and connecting the signal conducting path on the antenna side to any one of the signal conducting paths on the signal processing circuit side;
Have
A main line of a directional coupler having a main line and a sub line electromagnetically coupled to each other is interposed in at least one signal conductive path among the signal conductive paths on the plurality of signal processing circuits side,
A signal conducting path for guiding a signal transmitted from the main line by electromagnetic coupling to the signal conducting path on the other signal processing circuit side is connected to the sub line of the directional coupler,
When the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed by the switch means is connected to the signal conduction path on the antenna side, the main line of the directional coupler is interposed A signal is conducted to the signal conduction path on the signal processing circuit side, and the conduction signal is also supplied to the signal conduction path on the other signal processing circuit side through the sub line of the directional coupler. It is a feature. The radio communication apparatus of the present invention is characterized in that a communication signal path control circuit having a configuration specific to the present invention is provided.

  According to this invention, the main line of the directional coupler is interposed in at least one of the signal processing paths on the signal processing circuit side among the plurality of signal processing paths on the signal processing circuit connected to the switch means. The sub line of the directional coupler is connected to a signal conduction path on the side of the signal processing circuit different from the signal conduction path in which the main line is interposed. In this invention, it has a configuration in which only one signal conduction path of a plurality of signal processing paths connected to the switch means can be connected to the signal conduction path on the antenna side by the switch means. When the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed by the switch means is connected to the signal conduction path on the antenna side, the main line of the directional coupler The signal is conducted to the signal conducting path on the signal processing circuit side where the signal is interposed, and the signal can also be supplied to the signal conducting path on the other signal processing circuit side through the sub line of the directional coupler.

  For example, the signal conduction path on the side of the signal processing circuit connected to the signal processing circuit for the wireless communication system adopting the wireless communication method that needs to maintain the always-connected state with the wireless communication partner has directivity. The main line of the coupler is interposed, and the sub line of the directional coupler is electrically connected to the signal conduction path on the signal processing circuit side connected to the signal processing circuit for another wireless communication system. The configuration. By adopting such a configuration, a signal processing circuit for a wireless communication system that needs to maintain a constant connection state is electrically connected to the antenna by the switch means, and a signal for another wireless communication system is maintained. The processing circuit can also be connected to the antenna via the signal processing path on the signal processing circuit side connected to the signal processing circuit for the wireless communication system that needs to maintain the constantly connected state. That is, it is necessary to maintain the above-mentioned always-connected state while having a configuration in which only one of a plurality of signal processing circuits for a wireless communication system connected to the switch means is connected to the antenna by the switch means. Not only a signal processing circuit for a certain wireless communication system but also other signal processing circuits for a wireless communication system can be connected to the antenna to enable wireless communication. As a result, the wireless communication device including the communication signal path control circuit according to the present invention performs wireless communication of a wireless communication system that needs to maintain a constantly connected state while suppressing complication of the circuit configuration, and at the same time. The wireless communication of the wireless communication system can be performed.

  In addition, the signal conducting path for guiding the signal from the sub line of the directional coupler to the signal conducting path on the other signal processing circuit side is provided with a configuration in which switch means for controlling conduction on / off of the signal is provided. The following effects can be obtained. In other words, according to the present invention, a part of the power of the signal conducted through the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is passed through the sub line of the directional coupler. It is the structure supplied to the signal conduction path of the signal processing circuit side. For this reason, the signal level of the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is higher than that in the case where the main line of the directional coupler is not interposed. Lower. On the other hand, a switch means is provided in a signal conducting path for guiding a signal from the sub line of the directional coupler to a signal conducting path on the other signal processing circuit side, and the signal in which the main line of the directional coupler is interposed Only when it is necessary to transmit a signal from the signal conduction path on the processing circuit side to the signal conduction path on the other signal processing circuit side through the directional coupler, the switch means is controlled to be in a conduction-on state, In some cases, the switch means is controlled to be turned off. With this configuration, the signal energized in the signal conducting path on the side of the signal processing circuit in which the main line of the directional coupler is interposed is the power of the signal only when the switch means is in the conducting state. A part of the signal flows to the signal conduction path on the other signal processing circuit side via the directional coupler, so the signal conduction path on the signal processing circuit side on which the main line of the directional coupler is interposed. It is possible to suppress the state where the level of the conduction signal is low in a short time.

  A bypass conduction path is provided for bypassing the directional coupler to conduct the signal, and a signal is applied to the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed. Is switched to either one of a path for energizing through the main line of the directional coupler and a path for flowing through the bypass conduction path and avoiding the main line of the directional coupler. For example, the following effects can be obtained by providing the switching means. That is, when it is necessary to transmit a signal from a signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed to a signal conduction path on the other signal processing circuit side via the directional coupler Only by the switching means, the signal is conducted through the main line of the directional coupler, and in other cases, the signal is conducted to the bypass conduction path. With this configuration, the signal that is energized in the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is only a part of the signal power when necessary. Since the signal flows to the signal conduction path on the other signal processing circuit side through the circuit, the level of the conduction signal on the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is low Can be suppressed in a short time.

  In addition, when the switch means is provided in the signal conducting path from the sub line of the directional coupler as described above to the signal conducting path on the other signal processing circuit side, the same effect as described above can be obtained. Even if the switch means is in a conduction-off state, if the energization signal is a high-frequency signal, a small part of the power of the signal is transferred from the main line side of the directional coupler to the sub line and the switch means. Through the signal conducting path on the other signal processing circuit side. On the other hand, it is necessary to transmit a signal from the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed to the signal conduction path on the other signal processing circuit side via the directional coupler. When there is no signal, the signal is passed through the bypass conduction path so that the signal is not conducted to the directional coupling main line. With this configuration, the signal power is transferred from the directional coupler to the signal conducting path on the other signal processing circuit side from the directional coupler although the signal transmission to the signal conducting path on the other signal processing circuit side is not necessary. It is possible to eliminate a situation in which the part flows out through the switch means in the conductive off state. Thereby, it is possible to more reliably suppress a decrease in the level of the conduction signal in the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed.

  In the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed, the main lines of a plurality of directional couplers having different coupling degrees are connected in series, and all the directions are Each of the sub-lines of the sexual coupler has a common signal processing circuit side different from the signal conduction path on the signal processing circuit side to which the main line of the directional coupler is connected via a separate signal conduction path. Switch means is connected to each signal conduction path that is connected to the signal conduction path and connects the signal conduction path on the common signal processing circuit side and the sub-line of each of the directional couplers. By providing the provided configuration, the following effects can be obtained. That is, the coupling degree of the directional coupler that connects the signal conducting path on the signal processing circuit side where the main line of the directional coupler is interposed and the signal conducting path on the other signal processing circuit side can be selected. Since it is a structure, the coupling degree of a directional coupler can be selected according to the magnitude | size of the power of the signal received with the antenna. Thereby, for example, even if the level of the received signal of the antenna fluctuates, signal processing for a wireless communication system connected to the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed It is possible to supply a reception signal at a substantially constant level to a circuit or a signal processing circuit for a wireless communication system connected to a signal conducting path on the other signal processing circuit side.

  When the switch means is provided in the signal conduction path from the sub line of the directional coupler to the signal conduction path on the other signal processing circuit side, the impedance adjustment means is provided in the signal conduction path, and the switch means becomes conductive. When the switch means side is opened when the switch means side is viewed from the main line side of the directional coupler via the sub line when the switch is in the off state, the following effects can be obtained. Can be obtained. In other words, if the signal that is energized through the signal conduction path on the signal processing circuit side is a high-frequency signal, a part of the power of the high-frequency signal is lost by energizing the switch means even when the switch means is in a conduction-off state. Will occur. For this reason, despite the fact that the switch means is provided and the switch means is controlled to be in the conduction-off state, the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is connected to the directional coupler. There may be a problem that a part of the power of the signal flows to the signal conduction path on the other signal processing circuit side through the sub line and the switch means, thereby causing a loss of the signal.

  On the other hand, as described above, the impedance adjusting means as described above (for example, the main of the directional coupler is connected to the signal conducting path from the sub line of the directional coupler to the signal conducting path on the other signal processing circuit side. By providing a line (line) having an impedance for opening the switch means side when the switch means side is viewed from the line side via the sub line, the switch means is in a conductive off state. Since the side is open, it is possible to prevent a part of the signal power from flowing from the main line side of the directional coupler to the switch means side via the sub line. As a result, when the switch means is in a conduction-off state, signal loss due to the arrangement of the directional coupler in the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is reduced. It can reduce more reliably.

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1 schematically shows a communication signal path control circuit of the first embodiment. The communication signal path control circuit 1 includes a plurality of radio communication systems (in this first embodiment, PCS (Personal-Communication-Service), W-CDMA, DCS, EGSM (Extended-Global-System-for). This is a circuit provided in a wireless communication apparatus capable of supporting four wireless communication systems (Mobile-Communication-System). In the wireless communication apparatus in which the communication signal path control circuit 1 is incorporated, an antenna 2 common to the four wireless communication systems and a signal processing circuit 3 (3A to 3D) for each wireless communication system are provided. . The communication signal path control circuit 1 according to the first embodiment is for a radio communication system in which a reception signal of an antenna 2 is matched with the reception signal of the signal processing circuit 3 (3A to 3D) for each radio communication system. The signal processing circuit 3 leads the transmission signal output from the signal processing circuit 3 for the wireless communication system to the antenna 2.

  In the first embodiment, the communication signal path control circuit 1 includes a high-pass filter (HPF) 4, a low-pass filter (LPF) 5, a high-frequency switch means 6, and a low-frequency switch means 7, A signal conduction path 8 (8A to 8D) on the signal processing circuit side connected to the switch means 6 on the high frequency side, and a signal conduction path 9 (9A, 9A, 9B) on the signal processing circuit side connected to the switch means 7 on the low frequency side. 9B) and the duplexer 10.

  In the communication signal path control circuit 1 of the first embodiment, one end sides of the signal conduction paths of the HPF 4 and the LPF 5 are electrically connected to the antenna 2 via the signal conduction path 11 on the common antenna side. Yes. The other end side of the signal conduction path of the HPF 4 is connected to the signal conduction path 8 (8A to 8D) on the signal processing circuit side via the switch means 6 on the high frequency side. Further, the other end side of the signal conduction path of the LPF 5 is connected to the signal conduction path 9 (9A, 9B) on the signal processing circuit side via the switching means 7 on the low frequency side.

  The signal conduction path 8A on the signal processing circuit side is branched into two signal conduction paths 12a and 12b at a portion on the way from the switch means 6 side to the signal processing circuit 3 side. The signal conduction path 12a is for PCS. The signal processing path 12b is connected to the transmission signal output section of the DCS signal processing circuit 3C, and is connected to the transmission signal output section of the signal processing circuit 3A. The signal conduction path 8B on the signal processing circuit side is connected to the reception signal input section of the PCS signal processing circuit 3A. The signal conduction path 8C on the signal processing circuit side is connected to the duplexer 10, and this duplexer 10 is connected to the reception signal input unit of the signal processing circuit 3B for W-CDMA via the signal conduction path 13a. Are connected to the signal output unit for transmission of the signal processing circuit 3B for W-CDMA via the signal conducting path 13b. The signal conducting path 8D on the signal processing circuit side is connected to the reception signal input section of the DCS signal processing circuit 3C.

  W-CDMA is a communication system that performs wireless communication in a constantly connected state with a wireless communication partner. In the first embodiment, the signal on the signal processing circuit side connected to the W-CDMA signal processing circuit 3B. A main line (not shown) constituting the directional coupler 14 is interposed in the conduction path 8C, and a sub line (not shown) constituting the directional coupler 14 is connected via the signal conduction path 15. It is connected to the signal conduction path 8D on the signal processing circuit side.

  The signal conduction path 9A on the signal processing circuit side connected to the switch means 7 on the low frequency side is connected to the reception signal input section of the signal processing circuit 3D for EGSM, and the signal conduction path 9B on the signal processing circuit side is It is connected to the transmission signal output section of the signal processing circuit 3D for EGSM.

  In the first embodiment, the HPF 4 has a characteristic of passing a PCS communication signal, a W-CDMA communication signal, and a DCS communication signal, and attenuating an EGSM communication signal. The LPF 5 has a characteristic of passing an EGSM communication signal and attenuating a PCS communication signal, a W-CDMA communication signal, and a DCS communication signal. That is, the frequency band of the W-CDMA reception signal is about 2110 MHz to 2170 MHz, and the frequency band of the W-CDMA transmission signal is about 1920 MHz to 1980 MHz. The frequency band of the DCS reception signal is about 1805 MHz to 1880 MHz, and the frequency band of the DCS transmission signal is about 1710 MHz to 1785 MHz. The frequency band of the PCS reception signal is about 1900 MHz, and the frequency band of the PCS transmission signal is about 1800 MHz. The frequency band of the EGSM reception signal is about 925 MHz to 960 MHz, and the frequency band of the EGSM transmission signal is about 880 MHz to 915 MHz. HPF4 is lower than the lowest frequency (about 1700 MHz) of the PCS, W-CDMA and DCS communication signals, and higher than the highest frequency (about 960 MHz) of the EGSM communication signals. A frequency within the frequency range is used as a threshold, a signal having a frequency higher than the threshold frequency is transmitted, and a signal having a frequency lower than the threshold frequency is attenuated. LPF5 is lower than the lowest frequency (about 1700 MHz) among the communication signal frequencies of PCS, W-CDMA and DCS, and higher than the highest frequency (about 960 MHz) of the communication signal of EGSM. Has a frequency within the higher frequency range as a threshold, a signal having a frequency lower than the threshold frequency is transmitted, and a signal having a frequency higher than the threshold frequency is attenuated. .

  The high frequency side switching means 6 has a configuration in which the antenna side signal conducting path 11 is switched and connected to any one of the four signal processing circuit side signal conducting paths 8A to 8D. The switching control of the switch means 6 is performed by a control device (not shown) provided in the wireless communication device. For example, when the wireless communication device performs a transmission operation of a PCS or DCS wireless communication system, the control device switches the switching means so that the signal conducting path 11 on the antenna side is switched and connected to the signal conducting path 8A on the signal processing circuit side. 6 switching operation is controlled. When the wireless communication device performs the reception operation of the PCS wireless communication system, the control device switches the switch means 6 so that the signal conducting path 11 on the antenna side is switched and connected to the signal conducting path 8B on the signal processing circuit side. Controls the switching operation. Further, when the wireless communication device performs transmission / reception operation of the W-CDMA wireless communication system, the control device switches the switching means so that the signal conducting path 11 on the antenna side is switched and connected to the signal conducting path 8C on the signal processing circuit side. 6 switching operation is controlled. Furthermore, when the wireless communication device performs the reception operation of the DCS wireless communication system, the control device switches the switch means 6 so that the signal conducting path 11 on the antenna side is switched and connected to the signal conducting path 8D on the signal processing circuit side. Controls the switching operation.

  The switch means 7 on the low frequency side has a configuration in which the signal conducting path 11 on the antenna side is switched and connected to one of the signal conducting paths 9A and 9B on the two signal processing circuits side. The switching control of the switch means 7 is also performed by a control device (not shown) provided in the wireless communication device, similarly to the switch means 6. For example, when the wireless communication device performs the reception operation of the EGSM wireless communication system, the control device sets the switch means 7 so that the signal conducting path 11 on the antenna side is switched and connected to the signal conducting path 9A on the signal processing circuit side. Controls the switching operation. Further, when the wireless communication device performs the transmission operation of the EGSM wireless communication system, the control device sets the switch means 7 so that the signal conducting path 11 on the antenna side is switched and connected to the signal conducting path 9B on the signal processing circuit side. Controls the switching operation.

  The directional coupler 14 includes a main line and a sub line that are electromagnetically coupled, and has a configuration in which a signal flowing through the main line is transmitted to the sub line by electromagnetic coupling. For this reason, in the first embodiment, a signal conducting in the signal conducting path 8C on the signal processing circuit side is transmitted from the main line of the directional coupler 14 to the sub line by electromagnetic coupling, and the signal is transmitted to the sub line. To the signal conduction path 8D on the signal processing circuit side through the signal conduction path 15. The power of the signal transmitted from the main line to the sub line depends on the coupling degree of the directional coupler 14.

  In the first embodiment, the frequency band of W-CDMA reception signals is about 2110 MHz to 2170 MHz, and the frequency band of W-CDMA transmission signals is about 1920 MHz to 1980 MHz. The frequency band of the received signal and the signal for transmission is different. Using this frequency difference, the duplexer 10 supplies the W-CDMA reception signal to the W-CDMA signal processing circuit 3B, and outputs the transmission signal output from the W-CDMA signal processing circuit 3B. Has a structure for guiding to the antenna side.

  The communication signal path control circuit 1 of the first embodiment is configured as described above. An example of the circuit operation of the communication signal path control circuit 1 will be described below. For example, in the first embodiment, the antenna 2 can receive signals of four wireless communication systems of PCS, W-CDMA, DCS, and EGSM. When the signal received by the antenna 2 includes an EGSM reception signal, only the EGSM reception signal passes through the LPF 5 (in other words, only the EGSM reception signal is extracted by the LPF 5). When the signal processing circuit 3D for EGSM performs the receiving operation, the signal conducting path 9A on the signal processing circuit side is switched to the signal conducting path 11 on the antenna side by the switching operation of the switch means 7 by the switching control of the control device of the wireless communication apparatus. The connection is switched to. As a result, the EGSM reception signal extracted by the LPF 5 is guided to the EGSM signal processing circuit 3D through the signal conduction path 9A on the signal processing circuit side.

  When the signal processing circuit 3A for PCS performs a receiving operation, the signal conducting path 11 on the antenna side is switched to the signal processing circuit 8B on the signal processing circuit side by the switching operation of the switch means 6 by the switching control of the control device of the wireless communication apparatus. The connection is switched to. When the reception signal of the antenna 2 includes any of the reception signals of PCS, W-CDMA, and DCS, the reception signal of at least one wireless communication system of PCS, W-CDMA, and DCS is included. The reception signal on the higher frequency side passes through the HPF 4. Then, the reception signal on the high frequency side that has passed through the HPF 4 is guided to the signal conduction path 8B on the signal processing circuit side via the switch means 6. For example, a band-pass filter (BPF) that extracts only the PCS reception signal from the reception signal on the high frequency side is provided in the signal conduction path from the signal conduction path 8B on the signal processing circuit side to the signal processing circuit 3B for PCS. ) Or the like is interposed. The PCS reception signal taken out by the filter means is added to the PCS signal processing circuit 3B.

  Further, when the signal processing circuit 3C for DCS performs the receiving operation, the signal conducting path 11 on the antenna side is switched to the signal processing circuit 8D on the signal processing circuit side by the switching operation of the switch means 6 by the switching control of the control device of the wireless communication apparatus. The connection is switched to. As a result, the reception signal on the high frequency side received by the antenna 2 and passed through the HPF 4 is guided to the signal conduction path 8D on the signal processing circuit side via the switch means 6. For example, a band-pass filter (BPF) that extracts only the DCS reception signal from the high-frequency reception signal is provided in the signal conduction path from the signal conduction path 8D on the signal processing circuit side to the signal processing circuit 3C for DCS. ) Or the like is interposed. The DCS reception signal extracted by the filter means is applied to the DCS signal processing circuit 3C.

  Further, when the signal processing circuit 3B for W-CDMA performs a transmission / reception operation, the signal conducting path 11 on the antenna side is changed to the signal processing on the signal processing circuit side by the switching operation of the switch means 6 by the switching control of the control device of the wireless communication apparatus. It is switched and connected to the circuit 8C. As a result, the reception signal on the high frequency side received by the antenna 2 and passed through the HPF 4 is guided to the signal conducting path 8C on the signal processing circuit side via the switch means 6. Then, only the W-CDMA reception signal is extracted from the high-frequency high-side reception signal by the duplexer 10, and is supplied to the W-CDMA signal processing circuit 3B through the signal conduction path 13a. When a signal for transmission is output from the signal processing circuit 3B for W-CDMA, the signal for transmission is a signal conducting path 13b, duplexer 10, signal conducting path 8C, switch means 6, HPF 4, and antenna side signal. The signals are transmitted to the antenna 2 through the conduction path 11 in order, and the transmission signal is wirelessly transmitted from the antenna 2 to the outside.

  In the first embodiment, the main line of the directional coupler 14 is interposed in the signal conducting path 8C on the signal processing circuit side. For this reason, the conduction signal of the signal conduction path 8C on the signal processing circuit side is transmitted from the main line of the directional coupler 14 to the sub line by electromagnetic coupling, and passes through the signal conduction path 15 to the signal conduction path 8D on the signal processing circuit side. Is also supplied. When a DCS reception signal is included in the high frequency reception signal transmitted from the signal processing circuit side signal conduction path 8C to the signal conduction path 8D, the high frequency reception signal is selected from the high frequency reception signals. Only the DCS reception signal is extracted by the filter means that transmits only the DCS reception signal, and the DCS reception signal is supplied to the DCS signal processing circuit 3C. Thus, in the first embodiment, it is possible to simultaneously receive a DCS signal while performing W-CDMA wireless communication that needs to maintain a constant connection state.

  When the signal processing circuit 3A for PCS is performing a transmission operation, the signal processing circuit 8A on the signal processing circuit side is switched to the signal conducting path 11 on the antenna side by the switching operation of the switch means 6 by the switching control of the control device of the wireless communication apparatus. The connection is switched to. Thus, the transmission signal output from the PCS signal processing circuit 3A sequentially passes through the signal conduction path 12a, the signal conduction path 8A on the signal processing circuit side, the switch means 6, the HPF 4, and the signal conduction path 11 on the antenna side. Supplied to the antenna 2 and wirelessly transmitted from the antenna 2 to the outside.

  When the signal processing circuit 3C for DCS is performing the transmission operation, the signal processing circuit 8A on the signal processing circuit side is switched to the signal guide on the antenna side by the switching operation of the switch means 6 by the switching control of the control device of the wireless communication apparatus. It is switched and connected to the passage 11. As a result, the transmission signal output from the DCS signal processing circuit 3C sequentially passes through the signal conducting path 12b, the signal conducting path 8A on the signal processing circuit side, the switch means 6, the HPF 4, and the signal conducting path 11 on the antenna side. Supplied to the antenna 2 and wirelessly transmitted from the antenna 2 to the outside.

  Further, when the signal processing circuit 3D for EGSM is performing a transmission operation, the signal processing circuit 9B on the signal processing circuit side is switched by the switching operation of the switch means 7 by the switching control of the control device of the wireless communication apparatus. It is switched and connected to the passage 11. Thereby, the transmission signal output from the signal processing circuit 3D for EGSM is supplied to the antenna 2 through the signal conduction path 9B on the signal processing circuit side, the switch means 7, the LPF 5, and the signal conduction path 11 on the antenna side in order. Radio transmission is performed from the antenna 2 to the outside.

  The second embodiment will be described below. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and duplicate descriptions of common portions are omitted.

  In the second embodiment, as shown in FIG. 2, the signal conduction path 15 connected to the sub line of the directional coupler 14 is controlled to turn on / off the signal of the signal conduction path 15. Switch means 16 is interposed. This switch means 16 is subjected to switching control by the control device of the wireless communication apparatus. For example, when receiving a DCS signal when wireless communication by W-CDMA is being performed, the switch means 16 Is controlled to be in a switch-on state, and otherwise, the switch means 16 is controlled to be in a switch-off state.

  In the second embodiment, a line 17 serving as an impedance adjusting unit is provided at a portion of the signal conduction path 15 from the sub line of the directional coupler 14 to the switch unit 16. When the switch means 16 is in the switch-off state, the line 17 is in an electrically open state when the switch means 16 side is viewed from the main line side of the directional coupler 14 via the sub line. It has an impedance to become.

  The configuration of the second embodiment other than the switch means 16 and the line 17 is the same as that of the first embodiment.

  The third embodiment will be described below. In the description of the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and a duplicate description of the common portions is omitted.

  In the third embodiment, in addition to the configuration of the first embodiment, as shown in FIG. 3, a bypass conduction path 18 and a signal conduction path switching means 19 (19A, 19B) are provided. Further, a switch means 16 is interposed in the signal conducting path 15. The bypass conductive path 18 is located between the conductive path portion on the antenna side and the main line of the directional coupler 14 relative to the position of the main line of the directional coupler 14 in the signal conductive path 8C on the signal processing circuit side. It is a conduction path that bypasses the main line of the directional coupler 14 and is electrically connected to the conduction path portion closer to the signal processing circuit.

  In this third embodiment, the signal conduction path switching means 19A is connected to the part of the signal conduction path 8C on the signal processing circuit side closer to the antenna side than the position where the main line of the directional coupler 14 is interposed, and the bypass conduction path. 18 is provided at a connecting portion Xa. The switching means 19A is a switch for switching and connecting either the signal conducting path closer to the directional coupler 14 than the connecting portion Xa or the bypass conducting path 18 to the conducting path portion closer to the antenna than the connecting portion Xa. It is comprised by the means.

  In this third embodiment, the signal conduction path switching means 19B is provided between the part of the signal conduction path 8C closer to the signal processing circuit than the position of the main line of the directional coupler 14 and the bypass conduction path 18. It is provided in the connection part Xb. The switching means 19B switches and connects one of the signal conduction path closer to the directional coupler 14 than the connection part Xb and the bypass conduction path 18 to the conduction path part closer to the signal processing circuit than the connection part Xb. It is comprised by the switch means.

  Switching means 19A and 19B for switching the signal conduction path is subjected to switching control by the control device of the wireless communication device. For example, when a DCS signal is received during W-CDMA wireless communication, the conduction signal of the signal conduction path 8C on the signal processing circuit side energizes the main line of the directional coupler 14. In this way, the switching operation of the switching means 19A, 19B is controlled. The switch means 16 provided in the signal conducting path 15 is the same as the switch means 16 shown in the second embodiment. The switch means 16 is controlled to be in a conduction-on state by the control device of the wireless communication apparatus when receiving a DCS signal when W-CDMA wireless communication is being performed. By the switching operation of the switch means 16 and the signal conduction path switching means 19A and 19B, the received signal of the antenna 2 flows through the main line of the directional coupler 14 and is supplied to the signal processing circuit 3B for W-CDMA. In addition, the reception signal is transmitted from the main line of the directional coupler 14 to the signal conduction path 8D on the signal processing circuit side via the sub line and the signal conduction path 15, and the reception of the antenna 2 is also received by the signal processing circuit 3C for DCS. A signal is supplied.

  In cases other than the above, the conduction signal of the signal conduction path 8C on the signal processing circuit side flows along the path toward the W-CDMA signal processing circuit 3B through the bypass conduction path 18 avoiding the directional coupler 14. In addition, the switching operation of the switching means 19A, 19B is controlled.

  In the third embodiment, a bypass conduction path 18 and switching means 19A and 19B are provided, and the directional coupler 14 and the signal are connected from the signal conduction path 8C on the signal processing circuit side by the switching operation of the switching means 19A and 19B. Only when a signal is transmitted to the signal conducting path 8D via the switch means 16 of the conducting path 15, the signal is supplied to the directional coupler 14, and in other cases, the directional coupler 14 is avoided. Thus, the signal is conducted to the bypass conduction path 18. However, since the conduction signal of the signal conduction path 8C on the signal processing circuit side is a high-frequency signal, the switching means 19A and 19B cause the signal conduction path to pass through the bypass conduction path 18 without passing through the directional coupler 14. Even if the path is controlled, the signal may be slightly energized to the main line of the directional coupler 14 via the switching means 19A, 19B. For this reason, there is a concern that the signal that has flowed to the directional coupler 14 flows from the directional coupler 14 to the signal conducting path 8D via the signal conducting path 15 and increases the loss. Therefore, in this third embodiment, the switch means 16 as shown in the second embodiment is provided in the signal conducting path 15 and when there is no need to energize the signal conducting path 8D, the switch means. 16 was controlled to be in a switch-off state. As a result, when it is not necessary to transmit a signal from the signal conducting path 8C to the signal conducting path 8D, the switch means 16 performs a switch-off operation, resulting in signal leakage from the signal conducting path 8C to the signal conducting path 8D. The increase in loss is suppressed.

  If the degree of coupling of the directional coupler 14 is low and the risk of increased loss as described above is very small, the switch means 16 may be omitted.

  The fourth embodiment will be described below. In the description of the fourth embodiment, the same components as those in the first to third embodiments are denoted by the same reference numerals, and duplicate descriptions of the common portions are omitted.

In the fourth embodiment, as shown in FIG. 4, a plurality of directional couplers 14 (with different degrees of coupling are connected to the signal conduction path 8C on the signal processing circuit side through which the W-CDMA communication signal is energized. 14 _{1 to} 14 _n (n is an integer of 2 or more)) are interposed in series. The sub-lines of the directional couplers 14 _{1 to} 14 _n are connected to the signal conducting path 8D on the common signal processing circuit side through separate signal conducting paths 15 ₁ to 15 _n , respectively. In addition, switch means 16 _{1 to} 16 _n for controlling on / off of signal conduction are provided in the signal conduction paths 15 ₁ to 15 _n , respectively. The switching operation of each of the switch means 16 _{1 to} 16 _n is controlled by the control device of the wireless communication device.

  For example, information on the power value of the received signal suitable for supply to the signal processing circuit 3B for W-CDMA is given in advance to the control device. Further, the wireless communication apparatus is provided with means for detecting the power level of the received signal flowing from the antenna 2 to the signal conducting path 8C on the signal processing circuit side when performing W-CDMA wireless communication. Keep it. When a signal is transmitted from the signal conduction path 8C on the signal processing circuit side to the signal conduction path 8D during W-CDMA wireless communication, the control device transmits the received signal on the signal conduction path 8C. The magnitude of power is detected, and the W-CDMA signal processing circuit 3B uses the detection result and information on the power value of the reception signal setting appropriate for the W-CDMA signal processing circuit 3B. The directional coupler 14 having a degree of coupling for transmitting the received signal from the signal conducting path 8C to the signal conducting path 8D is selected while supplying a received signal of appropriate power. Further, the control device controls the switch means 16 of the signal conducting path 15 connected to the sub line of the selected directional coupler 14 to the switch-on state, and controls the other switch means 16 to the switch-off state. .

  The fifth embodiment will be described below. In the description of the fifth embodiment, the same components as those in the first to fourth embodiments are denoted by the same reference numerals, and duplicate descriptions of common portions are omitted.

  The fifth embodiment relates to a wireless communication apparatus. The wireless communication apparatus of the fifth embodiment can correspond to four wireless communication systems of PCS, W-CDMA, DCS, and EGSM. The wireless communication apparatus has an antenna 2 common to the four wireless communication systems, and is provided with a signal processing circuit 3 (3A to 3D) for each wireless communication system. Any of the communication signal path control circuits 1 shown in the first to fourth embodiments is provided on the conduction path of the communication signal between the antenna 2 and each signal processing circuit 3 (3A to 3D). One communication signal path control circuit 1 is provided. There are various configurations other than the communication signal path control circuit 1 of the wireless communication apparatus. In the fifth embodiment, any configuration other than the communication signal path control circuit 1 of the wireless communication apparatus is adopted. The description thereof is omitted here. In addition, since the configuration of the communication signal path control circuit 1 shown in the first to fourth embodiments has also been described above, the description thereof is omitted here.

  In addition, this invention is not limited to the form of each 1st-5th embodiment, Various embodiment can be taken. For example, each of the first to fifth embodiments corresponds to four wireless communication systems of PCS, W-CDMA, DCS, and EGSM, but the communication signal path control circuit 1 or the circuit 1 is If the number of wireless communication systems supported by the provided wireless communication apparatus is plural, the number is not limited, and the type of the corresponding wireless communication system is not limited.

  In the first to fifth embodiments, the sub line of the directional coupler 14 provided in the signal conducting path 8C connected to the W-CDMA signal processing circuit 3B is connected to the signal conducting path 8D. For example, a main line of another directional coupler 14 is also provided in the signal conducting path 8C, and the sub line of the directional coupler 14 is different from the signal conducting path 8D, for example, the signal conducting path. It is good also as a structure connected to the channel | path 8B. In this case, in a state where the signal conducting path 8C is switched and connected to the signal conducting path 11 on the antenna side by the switch means 6, the reception signal of the antenna 2 passes through the signal conducting path 8C and is a W-CDMA signal. In addition to being guided to the processing circuit 3B, each directional coupler 14 also guides the received signal to each of the PCS signal processing circuit 3A and the DCS signal processing circuit 3C.

  Further, in each of the first to fifth embodiments, the main line of the directional coupler 14 is connected to the signal conduction path 8C connected to the signal processing circuit 3B for W-CDMA which needs to maintain a constant connection state. Although the configuration is interposed, the main line of the directional coupler 14 may be interposed in another signal conduction path.

  Furthermore, in addition to the configuration of the fourth embodiment shown in FIG. 4, at least one of the signal conducting paths 15 connected to the sub-line of each directional coupler 14 (for example, the direction with the highest degree of coupling) The signal conducting path 15) connected to the sub line of the sexual coupler 14 may be provided with, for example, a line 17 which is an impedance adjusting means as shown in the second embodiment. Furthermore, in addition to the configuration of the fourth embodiment, for example, in the signal conduction path 8 on the signal processing circuit side, the directional coupler is provided in which the main lines of all the directional couplers 14 are interposed in series. All the directional couplers 14 are detoured and connected between the signal conducting path portion on the antenna side of the portion and the signal conducting path portion on the signal processing circuit side of the intervening portion of all the directional couplers 14. Provide a bypass conduction path. In addition, a path for energizing the signal conducting to the signal conducting path 8 on the signal processing circuit side where the main line of the directional coupler 14 is interposed via the main line of the directional coupler 14 and a detour There may be provided a signal conduction path switching means for switching to one of the paths that flow through the conduction path and avoid the main line of all the directional couplers 14 and energize.

It is a simple circuit diagram for demonstrating the communication signal path | route control circuit of the example of 1st Embodiment. It is a simple circuit diagram for demonstrating the communication signal path | route control circuit of the example of 2nd Embodiment. It is a simple circuit diagram for demonstrating the communication signal path | route control circuit of the example of 3rd Embodiment. It is a simple circuit diagram for demonstrating the communication signal path | route control circuit of the example of 4th Embodiment. It is a simple circuit diagram for demonstrating one example of a conventional communication signal path control circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication signal path control circuit 2 Antenna 3, 3A-3D Signal processing circuit 6, 7 Switch means 8 Signal processing circuit side signal conduction path 11 Antenna side signal conduction path 14 Directional coupler 15 Signal conduction path 16 Switch means 17 Line 18 bypass conduction path

Claims (7)

A reception signal of an antenna capable of performing wireless communication commonly corresponding to a plurality of wireless communication systems is received from among the signal processing circuits for each of the plurality of wireless communication systems provided in the wireless communication device. A communication signal path control circuit that leads to a signal processing circuit for a wireless communication system that matches a signal, and that guides a transmission signal output from the signal processing circuit for the wireless communication system to an antenna,
A signal conducting path on the antenna side connected to the antenna;
A plurality of signal processing circuit side signal conduction paths respectively connected to signal processing circuits for each wireless communication system;
Switch means for switching and connecting the signal conducting path on the antenna side to any one of the signal conducting paths on the signal processing circuit side;
Have
A main line of a directional coupler having a main line and a sub line electromagnetically coupled to each other is interposed in at least one signal conductive path among the signal conductive paths on the plurality of signal processing circuits side,
A signal conducting path for guiding a signal transmitted from the main line by electromagnetic coupling to the signal conducting path on the other signal processing circuit side is connected to the sub line of the directional coupler,
When the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed by the switch means is connected to the signal conduction path on the antenna side, the main line of the directional coupler is interposed The signal is conducted to the signal conduction path on the signal processing circuit side, and the conduction signal is also supplied to the signal conduction path on the other signal processing circuit side through the sub line of the directional coupler. A communication signal path control circuit.   The signal conducting path for guiding the signal from the sub line of the directional coupler to the signal conducting path on the other signal processing circuit side is provided with switch means for controlling on / off of the signal. Item 4. A communication signal path control circuit according to Item 1. The signal conduction path on the signal processing circuit side where the main line of the directional coupler is provided includes a conduction path portion on the antenna side with respect to the position where the main line of the directional coupler is interposed, and the main path of the directional coupler. A bypass conductive path that bypasses the directional coupler and electrically connects the conductive path portion on the signal processing circuit side with respect to the interposed position of the line;
The signal that is energized in the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed flows through the path that energizes through the main line of the directional coupler and the bypass conduction path. A switching means for switching the signal conduction path for switching to one of the paths to be energized while avoiding the main line of the directional coupler;
The communication signal path control circuit according to claim 1, wherein the communication signal path control circuit is provided.   In the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed, the main lines of a plurality of directional couplers having different degrees of coupling are interposed in series. Each sub-line of the coupler is a signal on the common signal processing circuit side that is different from the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed via a separate signal conduction path. Each signal conduction path connecting the common signal processing circuit side signal conduction path and the sub-line of each directional coupler is connected to a conduction path. 4. The communication signal path control circuit according to claim 1, wherein switch means for controlling off is provided.   The signal conducting path for guiding the signal from the sub line of the directional coupler to the signal conducting path on the other signal processing circuit side has a configuration in which switch means for controlling on / off of the signal is provided, and the switch When the switch means is in a signal conduction off state, the signal conduction path provided with the means is connected to the signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed in the direction described above. 5. The communication according to claim 2, 3 or 4, wherein impedance adjusting means for providing an electrically open state when the switch means side is viewed through the sex coupler is provided. Signal path control circuit.   The signal conduction path on the signal processing circuit side where the main line of the directional coupler is interposed is connected to the signal processing circuit of the wireless communication system adopting the wireless communication system that maintains the always connected state with the wireless communication partner. The communication signal path control circuit according to claim 1, wherein the communication signal path control circuit is a signal conduction path on a signal processing circuit side.   A wireless communication apparatus comprising the communication signal path control circuit according to any one of claims 1 to 6.

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