JP2011250362A - Transmission and reception module and mobile phone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a reception sensitivity of a transmission/reception module without deteriorating interference in a reception band of a cellular frequency band.SOLUTION: A transmission/reception module 10 includes: a first communication module 12 supporting a wireless LAN; a second communication module 13 supporting a BT; a first antenna connection terminal 14a to which a first external antenna 15a is connected; a second antenna connection terminal 14b to which a second external antenna 15b is connected; a first filter 16 connected to the first antenna connection terminal 14a; a second filter 17 connected to the second antenna connection terminal 14b; and RF switches 18 and 19. An external transmission/reception circuit 2 is provided to support a cellular system. The RF switches 18 and 19 allow selective transmission of a first and second transmission/reception circuits. An insertion loss in the second filter 17 is smaller than that in the first filter 16.

Description

  The present invention relates to a transmission / reception module equipped with two transmission / reception circuits corresponding to two wireless communication systems having different communication methods and a mobile phone including the transmission / reception module.

  Previously, to implement different communication methods, wireless LAN and Bluetooth (registered trademark), two modules corresponding to each communication were installed. Can contribute. Since wireless LAN and Bluetooth (registered trademark) are communication systems that use the same 2.4 GHz band, the simultaneous operation of both communication systems can be realized by adopting a communication control system that has a function of reducing mutual interference.

  When the set product is a mobile phone, it is necessary to take measures to suppress the mutual influence between the cellular system and the wireless LAN / Bluetooth (registered trademark). Therefore, in a conventional mobile phone, a band pass filter is inserted in each route of the wireless LAN / Bluetooth (registered trademark).

  FIG. 5 schematically shows a state in which the cellular transceiver circuit 2 and the transceiver module 3 are mounted in the casing of the mobile phone 1. The cellular transceiver circuit 2 is a module that performs transmission / reception using a cellular frequency band (for example, a maximum transmission band of 1.98 GHz and a maximum reception band of 2.17 GHz), and includes a dedicated transmission / reception antenna 2a. The transmission / reception module 3 includes a first communication module (for example, wireless LAN using 2.4 GHz) 4 and a second communication module (for example, Bluetooth (registered trademark) 5 using 2.4 GHz) in one package. ing. A transmission / reception antenna 7a is connected to the first antenna terminal 6a, and a bandpass filter 8a is provided in a path from the first antenna terminal 6a to the first communication module 4. In addition, a transmission / reception antenna 7b is connected to the second antenna terminal 6b, and a bandpass filter 8b is provided in a path from the second antenna terminal 6b to the second communication module 5.

  FIG. 6 shows the attenuation characteristics of the bandpass filters 8a and 8b. The bandpass filters 8a and 8b have characteristics in which attenuation of the transmission band (1.98 GHz) and reception band (2.17 GHz) of the cellular frequency band is ensured and attenuation of the communication band (2.4 GHz) of the transmission / reception module 3 is suppressed. Is required.

JP 2007-150566 A

  By the way, when viewed from the transmission / reception module 3, a steep attenuation characteristic is required for 2.17 GHz which is the reception band of the cellular frequency band in the transmission band. On the other hand, a severe attenuation characteristic of about 2.17 GHz is not required for 1.98 GHz which is the transmission band of the cellular frequency band in the reception band as seen from the transmission / reception module 3.

  However, since the transmission / reception module 3 uses the common antennas 7a and 7b for transmission / reception, the characteristics of the bandpass filters 8a and 8b correspond to the reception band (2.17 GHz) of the cellular frequency band, which is a stricter specification. It is set to the attenuated characteristic. As a result, there is a problem that the bandpass filters 8a and 8b increase the loss of the transmission / reception band (2.4 GHz) of the transmission / reception module 3 and deteriorate the reception sensitivity.

  The present invention has been made in view of this point, and provides a transmission / reception module and a mobile phone that can improve the reception sensitivity on the transmission / reception module side without deteriorating interference with the reception band of the cellular frequency band. With the goal.

  The transmission / reception module according to the present invention includes a first transmission / reception circuit corresponding to a first wireless communication system, and a second transmission / reception corresponding to a second wireless communication system using the same frequency band as that of the first wireless communication system. A circuit; a first antenna connection terminal to which a first external antenna is connected; a second antenna connection terminal to which a second external antenna is connected; and a first connected to the first antenna connection terminal. When the first filter is connected to one of the first or second filter, the second transmission / reception circuit is connected to the second antenna connection terminal. When the circuit is connected to the other filter and the first transmission / reception circuit is connected to the other of the first or second filter, the second transmission / reception circuit is connected to one filter. Turn off A switch means capable of switching, and a third transmitting / receiving circuit corresponding to a third wireless communication system having a different frequency system and a different system from the first and second wireless communication systems is provided outside. The transmission / reception module is set so that the first and second transmission / reception circuits can selectively transmit, and the insertion loss of the second filter is set smaller than the insertion loss of the first filter. It is characterized by being.

  According to this configuration, the first and second transmission / reception circuits are set so as to be selectively transmittable, and the insertion loss of the second filter is set smaller than the insertion loss of the first filter. For example, if the first or second transmission / reception circuit on the transmission side is connected to the first filter having a large insertion loss and the remaining transmission / reception circuits on the reception side are connected to the second filter having a small insertion loss, transmission is performed. Interference from the first or second transmission / reception circuit on the side to the third transmission / reception circuit can be suppressed, and loss of the transmission / reception circuit on the reception side can be reduced.

  In the transmission / reception module, the attenuation amount of the first filter in the transmission or reception frequency band of the third transmission / reception circuit is greater than the attenuation amount of the second filter in the transmission or reception frequency band of the third transmission / reception circuit. It is characterized by being set large.

  With this configuration, if the first transmission / reception circuit on the transmission side is connected to the first filter, the third transmission / reception among the RF signals radiated from the first transmission / reception circuit on the transmission side. The transmission or reception frequency band of the circuit can be sufficiently attenuated, and interference with the third transmission / reception circuit can be suppressed. Further, the attenuation of the RF signal taken into the first or second transmitting / receiving circuit on the receiving side can be reduced.

  In the transmission / reception module, the second transmission / reception circuit may be different in system from the first wireless communication system.

  In the transmission / reception module, the switching means includes a single-pole double-throw first switch circuit having a single-pole terminal connected to the first transmission-reception circuit, and a single-pole terminal connected to the second transmission-reception circuit. A single-pole double-throw second switch circuit, and the first filter includes one terminal of the double-throw side terminal of the first switch circuit and the double-throw side of the second switch circuit. One terminal of the terminal is connected, and the other terminal of the double throw side terminal of the first switch circuit and the other terminal of the double throw side terminal of the second switch circuit are connected to the second filter. When the first switch circuit is switched to the first filter side, the second switch circuit is switched to the second filter side, and the first switch circuit is switched to the first filter side. Switched to the filter side of 2 When the second switch circuit can be made to have been switched to the first filter side.

  In the transmission / reception module, when the third transmission / reception circuit operates, or when the third transmission / reception circuit is in a standby state and the reception level is lower than a predetermined level, the second antenna is connected to the first or second transmission / reception module. It is used only for reception of a circuit, and the first antenna can be used for transmission or reception of the second or first transmission / reception circuit.

  As a result, when the third transmission / reception circuit is operating or in a standby state when the reception level is lower than a predetermined level, the interference resistance against interference from the first or second transmission / reception circuit is weak. The second antenna that radiates a larger interference component is not used for transmission but for reception, so that interference is suppressed in the first or second transmission / reception circuit depending on the situation of the third transmission / reception circuit. Can be operated in the direction.

  In the transmission / reception module, when the third transmission / reception circuit is not operating or when the third transmission / reception circuit is in a standby state and the reception level is higher than the predetermined level, the transmission / reception radio wave status of the first or second transmission / reception circuit Accordingly, the first or second antenna can be switched between reception and transmission.

  Accordingly, when the third transmission / reception circuit is not operating or when the third transmission / reception circuit is in a standby state and the reception level is higher than the predetermined level, the interference resistance against interference from the first or second transmission / reception circuit is strong. Therefore, by switching the first or second antenna for reception or transmission according to the transmission / reception radio wave status of the first or second transmission / reception circuit, the setting giving priority to the performance of the first or second transmission / reception circuit can do.

  In the transmission / reception module, the first and second antennas may be set to be used as a diversity antenna for the first or second transmission / reception circuit.

  In the transmission / reception module, the first and second filters may be configured by bandpass filters.

  In the transmission / reception module, the first transmission / reception circuit may be a wireless LAN circuit, the second transmission / reception circuit may be a short-range wireless communication circuit, and the third transmission / reception circuit may be a cellular system circuit. good.

  A mobile phone including the third transmission / reception circuit and any of the transmission / reception modules in the same housing can be configured.

  According to the present invention, it is possible to improve the reception sensitivity on the transmission / reception module side without deteriorating interference with the reception band of the cellular frequency band.

System configuration diagram of a mobile phone provided with a transmission / reception module according to an embodiment Characteristic diagram showing attenuation of first and second band pass filters The figure which shows the connection state at the time of the transmission / reception operation | movement of the 1st and 2nd communication module. The figure which shows the change state of the antenna which is used to improve the performance of the communication module Schematic diagram showing a cellular system and a transceiver module mounted in a mobile phone housing Bandpass filter characteristics diagram for the set product shown in Fig. 5

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a system configuration diagram of a mobile phone provided with a transmission / reception module according to an embodiment of the present invention. A cellular phone 10 shown in FIG. 1 includes a cellular transceiver circuit 2 and a transceiver module 11. A cellular transmission / reception circuit 2 and a transmission / reception module 11 are accommodated in a casing of the mobile phone 10.

  The cellular transmission / reception circuit 2 is a third transmission / reception circuit installed externally as viewed from the transmission / reception module 11, and is a processing circuit and software for realizing the original functions (call function, mail function, browsing function, etc.) as a mobile phone. It is composed of wear. The cellular transceiver circuit 2 mainly performs wireless communication with a wireless infrastructure system (for example, a cellular base station) using a cellular frequency band (for example, a maximum transmission band of 1.98 GHz and a maximum reception band of 2.17 GHz). The cellular transceiver circuit 2 includes a transmission / reception antenna 2a that transmits and receives an RF signal for wireless communication with a wireless infrastructure system.

  The transmission / reception module 11 includes a first communication module (for example, wireless LAN using 2.4 GHz) 12 and a second communication module (for example, Bluetooth (registered trademark) using 2.4 GHz) 13 in one package. ing. The first communication module 12 is a transmission / reception circuit corresponding to a wireless LAN using, for example, 2.4 GHz, which is the first wireless communication system. The second communication module 13 is a transmission / reception circuit corresponding to Bluetooth (registered trademark) using, for example, 2.4 GHz which is the second wireless communication system.

  The transmission / reception module 11 is provided with a first antenna terminal 14a and a second antenna terminal 14b. A first antenna 15a is connected to the first antenna terminal 14a, and a second antenna 15b is connected to the second antenna terminal 14b. A first band pass filter 16 is connected between the first antenna terminal 14a and the first and second communication modules 12 and 13. A second band pass filter 17 is connected between the second antenna terminal 14 b and the first and second communication modules 12 and 13. The first communication module 12 is connected to a single pole side terminal of a single pole double throw type RF switch 18. One terminal of the double throw side terminal of the RF switch 18 can be connected to the first band pass filter 16, and the other terminal of the double throw side terminal of the RF switch 18 can be connected to the second band pass filter 17. Has been. The second communication module 13 is connected to a single pole side terminal of a single station double throw type RF switch 19. One terminal of the double throw side terminal of the RF switch 19 can be connected to the first band pass filter 16, and the other terminal of the double throw side terminal of the RF switch 19 can be connected to the second band pass filter 17. Has been.

  Here, the attenuation characteristics of the first band-pass filter 16 and the second band-pass filter 17 will be described. In the present embodiment, the first band-pass filter 16 sets the attenuation amount of the reception band (2.17 GHz) of the cellular transmission / reception circuit 2 with priority given to the suppression of interference with the cellular transmission / reception circuit 2, In the second band-pass filter 17, the attenuation of the reception band (2.17 GHz) of the cellular transceiver circuit 2 is set small with priority given to loss reduction of the use band (2.4 GHz). That is, the insertion loss of the second bandpass filter 17 is set to be smaller than the insertion loss of the first bandpass filter 16 that suppresses interference with the cellular transceiver circuit 2. Specifically, the attenuation amount of the first band-pass filter 16 in the transmission or reception frequency band (transmission band 1.98 GHz, reception band 2.17 GHz) of the cellular transceiver circuit 2 is It is set larger than the attenuation in the transmission or reception frequency band (transmission band 1.98 GHz, reception band 2.17 GHz) of the cellular transceiver circuit 2.

  If the first band-pass filter 16 is used as a filter when the first antenna 15a is used as an antenna for transmission, the reception band (2.17 GHz) of the cellular transceiver circuit 2 in the transmission band of the transceiver module 11 is used. It plays a role to attenuate the band corresponding to. Therefore, similarly to the bandpass filters 8a and 8b of the conventional transmission / reception module 3, the attenuation of the reception band (2.17 GHz) of the cellular transceiver circuit 2 at the expense of the loss of the transmission band (2.4 GHz) of the transmission / reception module 11 Is secured. As a result, when the first antenna 15a is used as a transmission antenna, the transmission band (2.4 GHz) of the transmission / reception module 11 is a loss of about 2.4 dB.

  On the other hand, since the second band-pass filter 17 is a filter when the second antenna 15b is used as a receiving antenna, the second band-pass filter 17 is an interference of the cellular transceiver circuit 2 that is interference received from the cellular transceiver circuit 2. It is only necessary to secure the attenuation of the transmission band (1.98 GHz), and it is not necessary to ensure the attenuation of the reception band (2.17 GHz) of the cellular transceiver circuit 2. The transmission band (1.98 GHz) of the cellular transceiver circuit 2 is farther from the transmission / reception band (2.4 GHz) of the transmission / reception module 11 than the reception band (2.17 GHz) of the cellular transmission / reception circuit 2. The band (2.4 GHz) can be suppressed to a small loss, and the attenuation amount of the target transmission band (1.98 GHz) can be secured.

  FIGS. 2A to 2C are characteristic diagrams showing attenuation amounts of the first band-pass filter 16 and the second band-pass filter 17. In the use band (2.4 GHz) of the transmission / reception module 11, the loss of the attenuation characteristic Q2 of the second bandpass filter 17 is smaller than the attenuation characteristic Q1 of the first bandpass filter 16 (FIG. 2B). . On the other hand, in the reception band (2.17 GHz) of the cellular transceiver circuit 2, the attenuation characteristic Q1 of the first bandpass filter 16 is cut (attenuation amount) more than the attenuation characteristic Q2 of the second bandpass filter 17. The interference is well suppressed (FIG. 2 (c)).

Next, the operation of the present embodiment configured as described above will be described.
In the present embodiment, the transmission / reception module 11 is configured such that the second communication module 13 performs a reception operation while the first communication module 12 is performing a transmission operation, and conversely, the second communication module 13 performs a second operation while the first communication module 12 is performing a reception operation. The communication module 13 is controlled from the cellular transceiver circuit 2 via the control line so as to perform a transmission operation.

  FIG. 3A shows a connection state when the first communication module 12 performs a transmission operation and the second communication module 13 performs a reception operation. One RF switch 18 is connected to the first bandpass filter 16 side which is the transmission side, and the other RF switch 19 is connected to the second bandpass filter 17 side which is the reception side.

  The RF signal transmitted from the first communication module 12 designated as the transmission module is input to the first bandpass filter 16 via the RF switch 18. The first band pass filter 16 sufficiently attenuates the reception band (2.17 GHz) of the cellular transceiver circuit 2 in the transmission band. An RF signal in which the reception band (2.17 GHz) of the cellular transceiver circuit 2 is sufficiently attenuated is radiated from the first antenna 15a. At this time, the reception band (2.17 GHz) of the cellular transceiver circuit 2 is sufficiently attenuated in the RF signal transmitted from the first communication module 12 even when the cellular transceiver circuit 2 is in use (for example, during a call). Therefore, the cellular transceiver circuit 2 can receive signals while suppressing interference in the reception band (2.17 GHz).

  Further, the second communication module 13 designated as the reception module receives the RF signal received by the second antenna 15 b via the second band pass filter 17. As described above, the second band-pass filter 17 realizes a sufficient attenuation with respect to the transmission band (1.98 GHz) of the cellular transceiver circuit 2, but the transmission / reception band (2.4 GHz) of the second communication module 13. Therefore, the desired signal can be received with the loss of the transmission / reception band (2.4 GHz) of the second communication module 13 being suppressed.

  FIG. 3B shows a connection state when the first communication module 12 is in a reception operation and the second communication module 13 is in a transmission operation. The other RF switch 19 is connected to the first band pass filter 16 side which is the transmitting side, and one RF switch 18 is connected to the second band pass filter 17 side which is the receiving side.

  The RF signal transmitted from the second communication module 13 designated as the transmission module is input to the first band pass filter 16 via the RF switch 19. The reception band (2.17 GHz) of the cellular transceiver circuit 2 in the transmission band is sufficiently attenuated by the first bandpass filter 16 and is radiated from the first antenna 15a.

  In addition, the first communication module 12 designated as the reception module receives the RF signal received by the second antenna 15 b via the second bandpass filter 17. The second band-pass filter 17 attenuates with a large attenuation with respect to the transmission band (1.98 GHz) of the cellular transceiver circuit 2 and suppresses the attenuation of the transmission / reception band (2.4 GHz) of the first communication module 13 to be small. It is done.

  Thus, according to the present embodiment, the first band-pass filter 16 having a large insertion loss and the second band-pass filter 17 having a small insertion loss are provided, and the first and second communication modules 12, Since the band-pass filter to be connected to the communication module is switched by the RF switches 18 and 19 depending on whether 13 is a transmission module or a reception module, the reception sensitivity is improved without changing the transmission power. Can do.

  In addition, the cellular phone according to the present embodiment can flexibly change the antenna to be used according to the situation (radio wave environment, standby state, power off) of the cellular transceiver circuit 2.

  For example, it is assumed that the state of the cellular transceiver circuit 2 is a standby state (power is on but not in a call), and the radio wave environment is good (reception field strength is strong). The radio wave environment of the cellular transceiver circuit 2 means that even if the first or second communication module 12 or 13 transmits using the second antenna 15b, the cellular transceiver circuit 2 has a required reception quality. It can be said that the received electric field intensity is as high as obtained. In such a radio wave environment, the performance of the first or second communication module 12, 13 can be improved by switching the antenna used as follows.

  FIG. 4A shows a state where the radio wave environment of the cellular transceiver circuit 2 is good and the antenna used is switched so as to improve the performance of the first communication module 12. For the purpose of improving the performance of the first communication module 12, the RF switch 18 connects the second bandpass filter 17 to the first communication module 12 to receive and also transmit the second antenna 15b. And the state of the RF switch 18 is fixed so as to be performed via the second band pass filter 17. On the other hand, the second communication module 13 connects the first band-pass filter 16 to the second communication module 12 with the RF switch 19, and not only receives but also transmits the first antenna 15 a and the first band. The state of the RF switch 19 is fixed so as to be performed via the pass filter 16. Control of the RF switches 18 and 19 is realized by giving a control signal from the cellular transceiver circuit 2 to a control unit (for example, a register) on the transceiver module side. The control unit on the transmission / reception module side may be mounted on the first communication module 12. In this case, the second communication module 13 may receive a control signal via the control unit of the first communication module 12.

  At this time, during the transmission operation of the first communication module 12, the RF signal that has passed through the second bandpass filter 17 is radiated from the second antenna 15b. As described above, the second band-pass filter 17 has a small attenuation in the reception band (2.17 GHz) of the cellular transceiver circuit 2, but if the radio wave environment of the cellular transceiver circuit 2 is good, the required reception quality is obtained. And a signal from the cellular base station can be detected. On the other hand, the first communication module 12 can transmit and receive an RF signal through the second bandpass filter 17 having a small attenuation in the use band (2.4 GHz) of the first communication module 12, so that loss is small and transmission efficiency is reduced. Can be improved.

  In order to improve the performance of the second communication module 13, the state of the RF switches 18 and 19 may be controlled in reverse. Further, when the cellular transceiver 2 is switched from the standby state to the talking state, the state of the RF switches 18 and 19 is returned to the original transmission / reception switching operation as shown in FIGS.

  The two antennas 15a and 15b can be attached at different angles in order to isolate the antennas in consideration of radio wave interference. In this case, for example, the antennas 15a and 15b that improve the radio wave condition with respect to the access point of the wireless LAN change.

  In the present embodiment, when the cellular transceiver circuit 2 is powered off, or when the received electric field strength is strong (greater than a predetermined value) in the standby state, the antenna 15a or 15b having the better radio wave condition is detected (FIG. 4). (B)). Therefore, the RF switches 18 and 19 are periodically switched by a control signal from the cellular transceiver circuit 2, and the RSSI values at the antennas 15a and 15b are stored in the first and second communication modules 12 and 13, respectively. The cellular transceiver circuit 2 takes in the RSSI values of the antennas 15a and 15b from the first and second communication modules 12 and 13, and detects the antennas 15a and 15b having good radio wave conditions. For example, when it is desired to improve the performance of the first communication module 12, the RF switches 18 and 19 are switched so as to use the antenna having the better radio wave condition (for example, the first antenna 15a). Thereby, an antenna having a good radio wave condition can be connected to a communication module whose performance is desired to be improved. Such antenna selection can be called antenna diversity.

  Note that the second antenna 15b is received by the first or second communication module 12, 13 when the cellular transceiver circuit 2 is operating (for example, in a call state) or when the reception level is lower than a predetermined level in the standby state. The first antenna 15 a may be used for transmission of the second communication module 13 or reception of the first communication module 12.

  In the above description, an example of a communication system that is different from the first communication module 12 and the second communication module 13 has been described. However, even in the same communication system (for example, both are wireless LANs) The invention is applicable. Moreover, although the example which mounted three communication modules in the housing of the mobile telephone 10 was demonstrated, it is applicable also to the combination with communication systems other than a cellular system.

  The present invention can be applied to a mobile phone in which wireless LAN and Bluetooth (registered trademark), which are different communication systems, are combined into one package and coexisted with a cellular system.

1, 10 cellular phone 2 cellular transceiver circuit 2
DESCRIPTION OF SYMBOLS 11 Transmission / reception module 12 1st communication module 13 2nd communication module 14a 1st antenna terminal 14b 2nd antenna terminal 15a 1st antenna 15b 2nd antenna 16 1st band pass filter 17 2nd band pass Filter 18, 19 RF switch

Claims (10)

A first transmission / reception circuit corresponding to the first wireless communication system;
A second transmitting / receiving circuit corresponding to a second wireless communication system having the same frequency band as that of the first wireless communication system;
A first antenna connection terminal to which a first external antenna is connected;
A second antenna connection terminal to which a second external antenna is connected;
A first filter connected to the first antenna connection terminal;
A second filter connected to the second antenna connection terminal;
When the first transmission / reception circuit is connected to one of the first or second filter, the second transmission / reception circuit is connected to the other filter, and the first transmission / reception circuit is connected to the first or second filter. Switch means capable of switching the connection state so that the second transmission / reception circuit is connected to one filter when connected to the other of the two filters,
A third transmission / reception circuit corresponding to a third wireless communication system that uses a different frequency band and a different system from the first and second wireless communication systems is provided outside, and the first and second transmission / reception circuits are provided outside. Is a transmission / reception module configured to be selectively transmittable,
The transmission / reception module, wherein an insertion loss of the second filter is set smaller than an insertion loss of the first filter.   The attenuation amount of the first filter in the transmission or reception frequency band of the third transmission / reception circuit is set larger than the attenuation amount of the second filter in the transmission or reception frequency band of the third transmission / reception circuit. The transmission / reception module according to claim 1.   The transmission / reception module according to claim 1 or 2, wherein the second transmission / reception circuit is different from the first wireless communication system. The switch means includes a single-pole double-throw first switch circuit having a single-pole side terminal connected to the first transmission / reception circuit, and a single-pole double-thin connection having a single-pole side terminal connected to the second transmission / reception circuit. A second switch circuit for throwing,
One terminal of the double throw side terminal of the first switch circuit and one terminal of the double throw side terminal of the second switch circuit are connected to the first filter,
The other terminal of the double throw side terminal of the first switch circuit and the other terminal of the double throw side terminal of the second switch circuit are connected to the second filter,
When the first switch circuit is switched to the first filter side, the second switch circuit is switched to the second filter side;
4. The first switch circuit according to claim 1, wherein when the first switch circuit is switched to the second filter side, the second switch circuit is switched to the first filter side. The transceiver module according to any one of the above.   When the third transmission / reception circuit is in operation, or when the third transmission / reception circuit is in a standby state and the reception level is lower than a predetermined level, the second antenna is used for reception by the first or second transmission / reception circuit. 5. The transmission / reception module according to claim 1, wherein the first antenna can be used for transmission or reception of the second or first transmission / reception circuit. .   When the third transmission / reception circuit is not operating, or when the third transmission / reception circuit is in a standby state and the reception level is higher than the predetermined level, the first or second transmission / reception circuit according to the transmission / reception radio wave status of the first transmission / reception circuit. 5. The transmission / reception module according to claim 1, wherein the first or second antenna can be switched between reception and transmission.   The transmission / reception module according to claim 6, wherein the first and second antennas are set to be used as a diversity antenna for the first or second transmission / reception circuit.   The transmission / reception module according to claim 1, wherein the first and second filters are band-pass filters. The first transmission / reception circuit is a wireless LAN circuit;
The second transmission / reception circuit is a short-range wireless communication circuit;
The transmission / reception module according to any one of claims 1 to 8, wherein the third transmission / reception circuit is a circuit for a cellular system. A mobile phone comprising the third transmission / reception circuit and the transmission / reception module according to claim 1 in the same housing.

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