Directional filter for mixers, converters and the like

Details Directional filter for mixers, converters and the like Directional filter for mixers, converters and the like

1979-07-16

1981-09-01

Gensler, Paul L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

330 49, 333110, 333231, H04B 126, H01P 1207, H01P 518

Patent

active

042876052

ABSTRACT:
First and second directional couplers each having a primary arm, a through arm and two secondary arms with a resonant circuit constructed to include the two secondary arms of each directional coupler. The directional filter forms a four port device with signals of a first frequency being applied to the first port and coupled to the fourth port by the resonant circuit, and signals applied to the third port being conveyed directly to the first port. Signals other than those at the first frequency are not coupled between the first and fourth ports.

REFERENCES:
patent: 3042883 (1962-07-01), Pannenborg et al.
patent: 3092790 (1963-06-01), Leake et al.
patent: 3560887 (1971-02-01), Napoli et al.
patent: 4061990 (1977-12-01), Ueno
Coale, A Traveling-Wave Directional Filter, IRE Transion MTT, Oct. 1956, pp. 256-260.

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