Wave transmission lines and networks – Coupling networks – Equalizers
Patent
1985-05-03
1986-11-11
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Equalizers
333208, H01P 1208, H04B 314
Patent
active
046225234
ABSTRACT:
A bandpass filter has a plurality of cascade waveguide 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: 2890421 (1959-06-01), Currie
patent: 3287667 (1966-11-01), Boutelant
patent: 3699480 (1972-10-01), Mueller
patent: 4410865 (1983-10-01), Young et al.
Com Dev Ltd.
LaRoche Eugene R.
Lee Benny T.
Schnurr Daryl W.
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