Antenna switching circuit and wireless communication system

Details Antenna switching circuit and wireless communication system Antenna switching circuit and wireless communication system

1996-05-22

1998-10-13

Le, Thanh Cong

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

4552771, 333103, H04B 144

Patent

active

058226842

ABSTRACT:
An antenna switching circuit (55) is constructed by a circulator element (63) having three terminals, of which the first terminal (CTX) is connected to the transmitting circuit, the second terminal (CANT) is connected to a first antenna (4), and the third terminal (CRX) can be connected to the terminal resistance (64) through a first switch element (62); a second switch element (60) capable of connecting the third terminal of the circulator element to the receiving circuit; and a third switch element (61) capable of connecting a second antenna (22) to the receiving circuit, whereby, it is no longer necessary to use a duplexer circuit having large insertion loss, the whole construction can be miniaturized, and the insertion loss can be reduced.

REFERENCES:
patent: 3276019 (1966-09-01), Fackler
patent: 4361905 (1982-11-01), Etherington et al.
patent: 4987392 (1991-01-01), Clark et al.
patent: 5047674 (1991-09-01), Clark et al.
patent: 5060293 (1991-10-01), Kok et al.
patent: 5276914 (1994-01-01), Ishizuka et al.
patent: 5477532 (1995-12-01), Hoshigami et al.
patent: 5594394 (1997-01-01), Sasaki et al.
patent: 5701595 (1997-12-01), Green, Jr.
Patent Abstracts of Japan, vol. 9, No. 291, 19 Nov. 1985--bases on JP-A-60 130932 (Morita) publ'd 12 Jul. 1985.

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