Ceramic filter having integral phase shifting network

Details Ceramic filter having integral phase shifting network Ceramic filter having integral phase shifting network

1988-10-31

1990-01-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333134, 333161, 333202, 455 78, H01P 118, H01P 1202, H01P 1213

Patent

active

048961248

ABSTRACT:
An integral phase shifting network of a transmitter filter provides a means to reduce the size and increase the efficiency of an antenna coupling network. The network to shift the phase of the transmitter filter is printed by depositing conductive material directly on a ceramic block using low-loss circuit elements and can be tuned easily by removing conductive material if required in certain applications. By utilizing an integral phase shifting network, either transmit or receive filters having a higly reactive and capacitive out-of-band impedance in the receive or transmit band, respectively, can be connected to a common antenna port without external transmission lines.

REFERENCES:
patent: Re32768 (1988-10-01), D'Avello et al.
patent: 4431977 (1984-02-01), Sokola et al.
patent: 4716391 (1987-12-01), Moutrie et al.
patent: 4740765 (1988-04-01), Ishikawa et al.
patent: 4742562 (1988-05-01), Kommrusch
patent: 4799033 (1989-01-01), Igarishi et al.

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