Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1980-02-27
1982-01-26
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333246, 455325, H01P 1203, H01P 1212, H04B 126
Patent
active
043130976
ABSTRACT:
A planar image reflection mode filter is provided for reflecting parasitic signal frequencies produced in the mixer of a receiver. The filter includes a reflecting quarter-wavelength filter and an adaptive circuit functioning to enable the transmission of desirable frequencies. A slot can be formed in the quarter-wavelength filter to enable odd-mode resonance and reduce the width of a transition frequency band lying between a reflection band and a transmission band.
REFERENCES:
patent: 3678433 (1972-07-01), Hallford
patent: 3688225 (1972-08-01), Cohn
Bates-"Design of Microstrip Spur-Line Band-Stop Filters", Microwaves, Optics and Acoustics, Nov. 1977, vol. 1, No. 6, pp. 209-214.
Kraus Robert J.
Nussbaum Marvin L.
U.S. Philips Corporation
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