Cascade waveguide triple-mode filters useable as a group delay e

Details Cascade waveguide triple-mode filters useable as a group delay e Cascade waveguide triple-mode filters useable as a group delay e

1984-01-24

1986-12-16

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Equalizers

333212, H01P 1208, H04B 314

Patent

active

046300090

ABSTRACT:
A bandpass filter has a plurality of cascade wave-guide cavities each resonating in three independent orthogonal modes. The cavities can be cylindrical or have a square cross-section. Where the cavities are circular, each cavity resonates in TE.sub.111 or TE.sub.010 modes simultaneously. Where the cavities have a square cross-section, each cavity resonates in TE.sub.011 and TM.sub.110 modes simultaneously. Between each triple-mode cavity, there is located an iris having an aperture with four separate radial slots that are offset from a center of the iris. The filter is capable of producing an elliptic function response. In a variation of the invention, an allpass filter has an output that is short circuited and, when used in conjunction with a circulator, it functions as a group delay equalizer. Previous triple-mode filters are not capable of producing an acceptable result relative to dual-mode filters.

REFERENCES:
patent: 2691766 (1954-10-01), Clapp
patent: 2890421 (1959-06-01), Currie
patent: 3085213 (1963-04-01), Walker
patent: 4180787 (1979-12-01), Pfitzenmaier
patent: 4251787 (1981-02-01), Young et al.
patent: 4410865 (1983-10-01), Young et al.
patent: 4453146 (1984-06-01), Fiedziusko
Bahieu, J. R., "Millimeter Wavelength Passive Components"; Journal; Nov. 1976, pp. 40-42.

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