Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1991-10-11
1994-01-04
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
375 5, 455129, 455280, H04B 144
Patent
active
052769143
ABSTRACT:
A antenna switching apparatus for a dual-mode transceiver which includes a transmission and reception antenna, a transmitting circuit, a receiving circuit, and a separating filter of large insertion loss is connected to the transmission and reception antenna, the transmitting circuit, and the receiving circuit for separating a transmission high frequency signal and a reception high frequency signal having different carrier frequencies, in which transmission and reception in the digital mode of the transmission and reception switching system and the transmission and reception in the analog mode of the simultaneous transmission and reception system is possible further includes an analog-to-digital change-over switch which changes-over mutual connections among the transmission and reception antenna, the transmitting circuit, the receiving circuit and the separating filter in response to the analog or digital mode, a blocking filter of low insertion loss for blocking a high frequency band of spurious signals caused by the switching of a transmission and reception change-over switch which changes-over the transmission and reception in the digital mode and a bandpass filter of low insertion loss for passing therethrough the reception high frequency signal in the digital mode, so that power consumption in the digital mode is reduced considerably.
REFERENCES:
patent: 4677688 (1987-06-01), Yoshihara et al.
patent: 4903257 (1990-02-01), Takeda et al.
patent: 4980660 (1990-12-01), Nahamura et al.
IEEE Transactions On Vehicular Teachnology, vol. 38, No. 1, Feb. 1989, New York, U.S., pp. 2-8, "Miniaturized SAW Devices For Radio Communication Transceivers" (Hikita et al.).
Ishizuka Seijiro
Kitakubo Kazuto
Eisenzopf Reinhard J.
Eslinger Lewis H.
Maioli Jay H.
Pham Chi
Sony Corporation
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