Image frequency reflection mode filter for use in a high-frequen

Details Image frequency reflection mode filter for use in a high-frequen Image frequency reflection mode filter for use in a high-frequen

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.

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