Interdigital duplexer with notch resonators

Details Interdigital duplexer with notch resonators Interdigital duplexer with notch resonators

1985-05-08

1986-06-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333 1, 333127, 333129, H01P 1213, H01P 512, H01P 1205

Patent

active

045969698

ABSTRACT:
A duplexer includes an integral interdigital transmitter filter and parallel interdigital receiver filter in a common housing. A three-quarter wavelength antenna transformer section couples rf energy from the transmitter filter to an antenna and also couples rf energy from the antenna to the receiver filter and to an antenna cable connector. The receiver filter selectivity is improved by providing a notch resonator between a receiver transformer section and the housing, and the transmitter filter selectivity is improved by providing a notch resonator between a transmitter resonator and the housing.

REFERENCES:
patent: 3068428 (1962-12-01), Alford et al.
patent: 3597709 (1971-08-01), Rhodes
patent: 3818389 (1974-06-01), Fisher
patent: 4168479 (1979-09-01), Rubin
patent: 4210881 (1980-07-01), Rubin
patent: 4281302 (1981-07-01), Stegens
patent: 4450421 (1984-05-01), Meguro et al.
patent: 4488130 (1984-12-01), Young et al.

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