Duplexer with an isolating circuit on a dielectric plate

Details Duplexer with an isolating circuit on a dielectric plate Duplexer with an isolating circuit on a dielectric plate

1988-08-26

1991-05-14

Lee, Benny

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333134, 333202, 333206, 455 82, 455 83, H03H 746

Patent

active

050159739

ABSTRACT:
A circuit such as a duplexer which isolates a first and second frequency signals respectively directed to and from an antenna terminal. A transmitter filter has a output terminal connected to a connecting point through a first inductor. A receiver filter has an input terminal connected to the connecting point. The connecting point is connected to the antenna terminal, and to ground through a second inductor. In a modified circuit the output terminal of the transmitter filter and the input terminal of the receiver filter are respectively connected to the connecting point through first and second capacitors. In the preferred embodiments the transmitter filter and the receiver filter are mounted to one side of a dielectric plate and the inductor and/or capacitors are formed by electrically conductive step lines and a capacitance patterns formed on the opposite side of the dielectric plate.

REFERENCES:
patent: 2768351 (1956-10-01), Scholten et al.
patent: 3656162 (1972-04-01), Mee
patent: 4462098 (1984-07-01), D'Avello et al.
patent: 4730173 (1988-03-01), Tsunoda
patent: 4799033 (1989-01-01), Igarashi et al.
Uwano, Tomoki, "Ceramic-Filled Resonator Cuts Costs of Radio-Telephone Filters", Electronics, Jul. 14, 1983, pp. 129-131.

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