Broadband radio transceiver

Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention

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Details

455 82, 455 83, 455 90, 455129, 333129, H04B 146

Patent

active

053752562

ABSTRACT:
A radio transceiver having improved impedance matching characteristics between a rod-like antenna and transmitting and receiving portions. An impedance matching circuit is provided between the antenna and a duplexer to impedance-match therebetween at a frequency within a desired signal frequency band. A transmitting signal and a receiving signal may have substantially different frequencies in which case the impedance matching circuit operates advantageously in a range between these signals, respectively. The impedance matching circuit includes a first inductor inserted between the antenna and the duplexer, a first capacitor inserted between the antenna and ground potential, and a parallel resonance circuit composed of a parallel circuit of a second capacitor and a second inductor inserted between the duplexer and ground potential.

REFERENCES:
patent: 3134075 (1964-05-01), Langevin
patent: 3305779 (1967-02-01), Errichiello
patent: 3891947 (1975-06-01), Debost
patent: 4055807 (1977-10-01), Priniski et al.
patent: 4170756 (1979-10-01), Sheppard
patent: 4181889 (1980-01-01), Davis et al.
patent: 4209758 (1980-06-01), Snedkervd et al.
patent: 4229826 (1980-10-01), Wanzer
patent: 4476578 (1984-10-01), Gaudin et al.

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