Source: http://www.google.com/patents/US7904031?dq=6377161
Timestamp: 2014-07-31 02:05:17
Document Index: 315206861

Matched Legal Cases: ['Application No. 04799420', 'Application No. 04799420', 'Application No. 2008', 'Application No. 200400318150', 'Application No. 04799420', 'Application No. 2005', 'Application No. 2005', 'Application No. 04']

Patent US7904031 - High-frequency module for transmitting and receiving transmission-reception ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA high-frequency module includes a GaAs switch defining an FET switch for selectively connecting one of four RF input-output terminals to an antenna input-output terminal to be connected to an antenna. A GSM transmission signal input terminal is connected to the RF input-output terminal of the GaAsSW...http://www.google.com/patents/US7904031?utm_source=gb-gplus-sharePatent US7904031 - High-frequency module for transmitting and receiving transmission-reception signals of at least three communication systems using a single antennaAdvanced Patent SearchPublication numberUS7904031 B2Publication typeGrantApplication numberUS 10/595,783Publication dateMar 8, 2011Filing dateNov 1, 2004Priority dateNov 11, 2003Also published asCN1875550A, CN100571051C, EP1684439A1, EP1684439A4, EP1684439B1, US20080318623, WO2005046071A1Publication number10595783, 595783, US 7904031 B2, US 7904031B2, US-B2-7904031, US7904031 B2, US7904031B2InventorsKoji Furutani, Shinya WatanabeOriginal AssigneeMurata Manufacturing Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (32), Non-Patent Citations (9), Referenced by (2), Classifications (12), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetHigh-frequency module for transmitting and receiving transmission-reception signals of at least three communication systems using a single antennaUS 7904031 B2Abstract A high-frequency module includes a GaAs switch defining an FET switch for selectively connecting one of four RF input-output terminals to an antenna input-output terminal to be connected to an antenna. A GSM transmission signal input terminal is connected to the RF input-output terminal of the GaAsSW through a low-pass filter, and a DCS/PCS transmission signal input terminal is connected to the RF input-output terminal through a low-pass filter. A GSM 850 reception signal output terminal and a PCS reception signal output terminal are connected to the RF input-output terminal through a diplexer, and a GSM 900 reception signal output terminal and a PCS reception signal output terminal are connected to the RF input-output terminal through a diplexer.
SUMMARY OF THE INVENTION In order to overcome the problems described above, preferred embodiments of the present invention provide a relatively small and less expensive high-frequency module in which the isolation between transmission-reception signals in a plurality of communication systems, three or more systems, for example, is sufficiently secured and each transmission-reception signal is securely transmitted and received.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a high-frequency module according to a first preferred embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A high-frequency module according to a first preferred embodiment of the present invention is described with reference to FIGS. 1 to 4.
Moreover, in the present preferred embodiment, a transmission signal of GSM 850 MHz (hereinafter referred to as a �GSM 850 MHz transmission signal�) or a transmission signal of GSM 900 MHz (hereinafter referred to as a �GSM 900 MHz transmission signal�) is inputted from a transmission signal input terminal Tx12, a reception signal of GSM 850 MHz (hereinafter referred to as a �GSM 850 MHz reception signal�) is outputted from a reception signal output terminal Rx1, and a reception signal of GSM 900 MHz (hereinafter referred to as a �GSM 900 MHz reception signal�) is outputted from a reception signal output terminal Rx2. Furthermore, a DCS transmission signal or a PCS transmission signal is inputted from a transmission input terminal Tx34, a DCS reception signal is outputted from a reception signal output terminal Rx3, and a PCS reception signal is outputted from a reception signal output terminal Rx4. Each of these transmission signal input terminals and reception signal output terminals corresponds to an �input-output portion� of various preferred embodiments of the present invention.
In a GaAs switch GaSaSW (hereinafter simply referred to as a �GaAsSW�), an antenna input-output terminal ANT connected to an antenna ANT through a capacitor Cant, RF input-output terminals RF1 to RF4 (hereinafter simply referred to as a �RF1 terminal, RF2 terminal, RF3 terminal, and RF4 terminal�, respectively) for inputting and outputting one of transmission-reception signals of GSM/DCS/PCS communication systems, a drive voltage input terminal Vdd, and control signal input terminals Vc1 and Vc2 are provided. While a drive voltage Vdd is applied, the GaAsSW is switched in such a way that the antenna input-output terminal ANT is connected to one of the RF1 terminal to RF4 terminal depending on the combination of ON/OFF of two control signals Vc1 and Vc2. The GaAsSW is mounted on the upper surface of a laminate constituting the high-frequency module. The GaAsSW corresponds to an �FET switch� of various preferred embodiments of the present invention, the antenna input-output terminal ANT corresponds to an �antenna input-output portion� of various preferred embodiments of the present invention, the RF1 terminal to RF4 terminal corresponds to �signal input-output portions� of various preferred embodiments of the present invention, and the RF4 terminal correspond to �signal input-output portions where transmission signals or reception signals of at least two communication systems are inputted and outputted� of various preferred embodiments of the present invention.
When a GSM 850 transmission signal and GSM 900 transmission signal (hereinafter generally referred to as a �GSM transmission signal�) are transmitted, control signals for connecting the antenna input-output terminal ANT and the RF1 terminal are inputted to the control signal input terminals Vc1 and Vc2 of the GaAsSW. When the control signals of this combination are inputted (for example, the control signals of positive voltage are inputted to Vc1 and Vc2), the RF1 terminal and the antenna input-output terminal ANT of the GaAsSW are made conductive to each other. At this point, when a GSM transmission signal is inputted from the GSM 850/GSM 900 transmission signal input terminal Tx12, the GSM transmission signal is inputted to the RF1 terminal through the low-pass filter LPF1 and transmitted from the RF1 terminal to the antenna input-output terminal ANT. The GSM transmission signal is outputted from the antenna input-output terminal ANT to the antenna ANT and transmitted from the antenna ANT to the outside. Here, in the GaAsSW, since the antenna input-output terminal ANT and the RF1 terminal are made conductive to each other and the other RF2 terminal to RF4 terminal are made open, the GSM transmission signal is not transmitted to the other RF2 terminal to RF4 terminal. Thus, the GSM transmission signal is not transmitted to the DCS/PCS transmission signal input terminal Tx34, GSM 850 reception signal input terminal Rx1, GSM 900 reception signal output terminal Rx2, DCS reception signal output terminal Rx3, and PCS reception signal output terminal Rx4.
When a DCS transmission signal or PCS transmission signal (hereinafter generally referred to as a �DCS/PCS transmission signal�) is transmitted, control signals for connecting the antenna input-output terminal ANT and the RF2 terminal are inputted to the control signal input terminals Vc1 and Vc2 of the GaAsSW. When the control signals for the combination are inputted (for example, the control signal of positive voltage is inputted to Vc1 and the control signal of zero voltage or negative voltage is inputted to Vc2), the RF2 terminal and the antenna input-output terminal ANT of the GaAsSW are made conductive to each other. At this point, when a DCS/PCS transmission signal is inputted from the DCS/PCS transmission signal input terminal Tx34, the DCS/PCS transmission signal is inputted to the RF2 terminal through the low-pass filter LPF2 and transmitted from the FR2 terminal to the antenna input-output terminal ANT. The DCS/PCS transmission signal is outputted from the antenna input-output terminal ANT to the antenna ANT and transmitted from the antenna to the outside. Here, in the GaAsSW, since the antenna input-output terminal ANT and the RF2 terminal are made conductive to each other and the other RF1 terminal, RF3 terminal, and RF4 terminal are made open, the DCS/PCS transmission signal is not transmitted to the other RF1 terminal, RF3 terminal, and RF4 terminal. Thus, the DCS/PCS transmission signal is not transmitted to the GSM transmission signal input terminal Tx12, GSM 850 reception signal output terminal Rx1, GSM 900 reception signal output terminal Rx2, DCS reception signal output terminal Rx3, and PCS reception signal output terminal Rx4.
In a GaAsSw switch GaAsSw (hereinafter simply referred to as a �GaAsSw�), an antenna input-output terminal ANT connected to an antenna ANT through a capacitor Cant, RF1 terminal to RF4 terminal for inputting and outputting one of transmission-reception signals of GSM/DCS/PCS/WCDMA communication systems, a drive voltage input terminal Vdd, and control signal input terminals Vc1 and Vc2 are provided. In the GaAsSW in which a drive voltage Vdd is applied, the antenna input-output terminal ANT is switched so as to be connected to one of the RF1 terminal to RF4 terminal by a combination of ON/OFF states of two control signals Vc1 and Vc2. The GaAsSW is mounted on the upper surface of a laminate constituting the high-frequency module. The GaAsSW corresponds to an �FET switch� of various preferred embodiments of the present invention, the antenna input-output terminal ANT corresponds to an �antenna input-output portion� of various preferred embodiments of the present invention, the RF1 terminal to RF4 terminal correspond to �signal input-output portions� of various preferred embodiments of the present invention, and the RF1 terminal and RF4 terminal correspond to �signal input-output portions in which transmission signals or reception signals of at least two communication systems are inputted and outputted� of various preferred embodiments of the present invention.
When a DCS transmission signal or PCS transmission signal (hereinafter generally referred to as a �DCS/PCS transmission signal�) is transmitted, control signals for connecting the antenna input-output terminal ANT and the RF2 terminal are inputted to the control terminals Vc1 and Vc2 of the GaAsSW. When the control signals for the combination (for example, the control signal of positive voltage is inputted to Vc1 and the control signal of zero voltage or negative voltage is inputted to Vc2), the RF2 terminal and the antenna input-output terminal ANT of the GaAsSW are made conductive to each other. At this point, when the DCS/PCS transmission signal is inputted from the DCS/PCS transmission signal input terminal Tx23, the DCS/PCS transmission signal is inputted to the RF2 terminal through the low-pass filter LPF3 and transmitted from the FR terminal RF2 to the antenna input-output terminal ANT. The DCS/PCS transmission signal is outputted from the antenna input-output terminal ANT to the antenna ANT and transmitted from the antenna to the outside. Here, in the GaAsSW, since the antenna input-output terminal ANT and the RF2 terminal are made conductive to each other and the other RF1 terminal, RF3 terminal, and RF4 terminal are made open, the DCS/PCS transmission signal is not transmitted to the other RF1 terminal, RF3 terminal, and RF4 terminal. Thus, the DCS/PCS transmission signal is not transmitted to the GSM transmission signal input terminal Tx1, GSM reception signal output terminal Rx1, DCS reception signal output terminal Rx2, PCS reception signal output terminal Rx3, and WCDMA transmission-reception signal input-output terminal Tx/Rx4.
Moreover, in the present preferred embodiment, a GSM transmission signal is inputted from a transmission signal input terminal Tx1, and a GSM reception signal is outputted from a reception signal output terminal Rx1. Then, a DCS/PCS transmission signal is inputted from a transmission signal input terminal Tx23, a DCS reception signal is outputted from a reception signal output terminal Rx2, and a PCS reception signal is outputted from a reception signal output terminal Rx3. Each of the transmission signal input terminals, reception signal output terminals, and transmission-reception signal input-output terminal corresponds to an �input-output portion� of various preferred embodiments of the present invention.
In a GaAsSw switch GaAsSw (hereinafter simply referred to as a �GaAsSw�), an antenna input-output terminal ANT connected to an antenna ANT through a capacitor Cant, RF1 terminal to RF4 terminal for inputting and outputting one of transmission-reception signals of GSM/DCS/PCS communication systems, a drive voltage input terminal Vdd, and control signal input terminals Vc1 and Vc2 are provided. In the GaAsSW in which a drive voltage Vdd is applied, the RF1 terminal to RF4 terminal are switched so as to be connected to the antenna input-output terminal ANT by a combination of ON/OFF states of two control signals Vc1 and Vc2. The GaAsSW is mounted on the upper surface of a laminate constituting the high-frequency module. The GaAsSW corresponds to an �FET switch� of various preferred embodiments of the present invention, the antenna input-output terminal ANT corresponds to an �antenna input-output portion� of various preferred embodiments of the present invention, the RF1 terminal to RF4 terminal correspond to �signal input-output portions� of various preferred embodiments of the present invention, and the RF4 terminal corresponds to a �signal input-output portion in which transmission signals or reception signals of at least two communication systems are inputted and outputted� of various preferred embodiments of the present invention.
When a DCS transmission signal or PCS transmission signal (hereinafter generally referred to as a �DCS/PCS transmission signal�) is transmitted, control signals for connecting the antenna input-output terminal ANT and the RF2 terminal are inputted to the control terminals Vc1 and Vc2 of the GaAsSW. When the control signals for the combination (for example, the control signal of positive voltage is inputted to Vc1 and the control signal of zero voltage or negative voltage is inputted to Vc2), the RF2 terminal and the antenna input-output terminal ANT of the GaAsSW are made conductive to each other. At this point, when the DCS/PCS transmission signal is inputted from the DCS/PCS transmission signal input terminal Tx23, the DCS/PCS transmission signal is inputted to the RF2 terminal through the low-pass filter LPF5 and transmitted from the FR2 terminal to the antenna input-output terminal ANT. The DCS/PCS transmission signal is outputted from the antenna input-output terminal ANT to the antenna ANT and transmitted from the antenna to the outside. Here, in the GaAsSW, since the antenna input-output terminal ANT and the RF2 terminal are made conductive to each other and the other RF1 terminal, RF3 terminal, and RF4 terminal are made open, the DCS/PCS transmission signal is not transmitted to the other RF1 terminal, RF3 terminal, and RF4 terminal. Thus, the DCS/PCS transmission signal is not transmitted to the GSM transmission signal input terminal Tx1, GSM reception signal output terminal Rx1, DCS reception signal output terminal Rx2, and PCS reception signal output terminal Rx3.
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