Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1994-09-16
1995-08-15
Gensler, Paul
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
333104, 333134, 455 83, H04B 146
Patent
active
054428122
ABSTRACT:
An antenna switching apparatus for selectively connecting an antenna to either a transmitter for transmitting a transmitting signal having a transmitting frequency, or a receiver for receiving a receiving signal having a receiving frequency, which is different from the transmitting frequency, includes an antenna terminal electrically connected to the antenna; a transmitting terminal electrically connected to the transmitter, and a receiving terminal electrically connected to the receiver. A receiving filter for passing a receiving signal therethrough is electrically connected between the antenna terminal and the receiving terminal. An impedance adjusting element is electrically connected to an input end of the receiving filter, and has an element value such that an impedance when seen from the antenna terminal looking toward the receiving filter becomes substantially infinity at the transmitting frequency. Further, a switching device is electrically connected between the antenna terminal and the transmitting terminal, wherein it is turned on or off in response to a control signal.
REFERENCES:
patent: 4055807 (1977-10-01), Priniski et al.
patent: 4677688 (1987-06-01), Yoshihara et al.
patent: 5023866 (1991-06-01), DeMuro
patent: 5054114 (1991-10-01), Erickson
patent: 5293141 (1994-03-01), Kobayashi et al.
"RF Front End Circuit Components Miniaturized Using Dielectric Resonators for Cellular Porable Telephones", Toshio Nishikawa, 2234 The Transactions of the Institute of Electronics, Information and Comm. Engineers E74 (1991) Jun., No. 6, Tokyo.
Aizawa Kimio
Iizuka Shogo
Ishizaki Toshio
Kosugi Hiroaki
Nakakubo Hideaki
Gensler Paul
Matsushita Electric - Industrial Co., Ltd.
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