Antenna duplexer

Details Antenna duplexer Antenna duplexer

1994-05-25

1996-07-09

Lee, Benny

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333129, 333134, 333206, 455 83, 370 38, H01P 1213

Patent

active

055348297

ABSTRACT:
An object of the present invention is to improve the characteristics of the conventional antenna duplexer and to provide an antenna duplexer contributing to higher performance and smaller size of a mobile communication apparatus. The antenna duplexer has a filter for wave receiving and a filter for wave transmission, and respective one ends of both the filters are connected to an antenna shared terminal through a matching circuit constituted by transmission lines. The characteristic impedance of at least one of a transmission line for connecting the antenna shared terminal and the filter for wave receiving to each other and a transmission line for connecting the antenna shared terminal and the filter for wave transmission to each other is set to a value other than the standard characteristic impedance of a receiver circuit and a transmitter circuit connected to the antenna duplexer. The total impedance of the filters for wave transmission and wave receiving and the respective transmission lines is set to the standard characteristic impedance.

REFERENCES:
patent: 5023866 (1991-06-01), De Muro
patent: 5293141 (1994-03-01), Kobayashi et al.
patent: 5323127 (1994-06-01), Komazaki et al.
patent: 5374906 (1994-12-01), Noguchi et al.
patent: 5375256 (1994-12-01), Yokoyama et al.

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