Antenna switching circuits for radio telephones

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

Patent

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Details

455 84, 333101, 370280, H04B 144

Patent

active

057686912

ABSTRACT:
Disclosed are various embodiments of circuitry for coupling first and second transceivers of a dual band radio telephone to integral and external antennas. The circuitry uses impedance matching lengths of transmission lines and switches arranged to provide a minimum insertion loss. Also disclosed is an embodiment for use with a single band radio telephone, such as a digital TDMA radio telephone that either transmits or receives at any given time. Also disclosed is an antenna switching arrangement for a dual band phone that eliminates a requirement for duplexers.

REFERENCES:
patent: 4955039 (1990-09-01), Rother et al.
patent: 5079520 (1992-01-01), Rapeli
patent: 5291474 (1994-03-01), Ikonen et al.
patent: 5301367 (1994-04-01), Heinonen
patent: 5325075 (1994-06-01), Rapeli
patent: 5386203 (1995-01-01), Ishihara
patent: 5390168 (1995-02-01), Vimpari
patent: 5471652 (1995-11-01), Hulkko

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