Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1996-01-30
1997-05-27
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 83, 333104, 333132, H04B 144, H01P 110
Patent
active
056342004
ABSTRACT:
In an antenna duplexer, one antenna is used by switching transmission signals and reception signals having different frequencies. The antenna duplexer includes a high-frequency switching circuit and a band-pass filter. The high-frequency switching circuit supplies the transmission signals from a transmission part to the antenna. The band-pass filter outputs the reception signals outputted from the antenna to the predetermined receiving circuit. In the band-pass filter, the frequency characteristic is selected and set to impress the frequency of the transmission signals, and simultaneously the reflected wave generated at the input end so that impedance increases at the frequency band of the transmission signals.
REFERENCES:
patent: 3452299 (1969-06-01), Angel
patent: 4677688 (1987-06-01), Yoshihara
patent: 5023866 (1991-06-01), De Muro
patent: 5129098 (1992-07-01), McGirr
Ayasli et al., 6-10 GHz GaAs FET Transmit-Receive Switch, IEEE GaAs IC Symposium pp. 106-108 (1983).
Hirota Shinichi
Iida Sachio
Kitakubo Kazuto
Oki Ryuji
Eisenzopf Reinhard J.
Le Thanh
Maioli Jay H.
Sony Corporation
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