H - Electricity – 01 – P
Patent
H - Electricity
01
P
333/68
H01P 1/208 (2006.01)
Patent
CA 1189154
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 TE111 and TM010 modes simultaneously. Where the cavities have a square cross-section, each cavity resonates in TE101 and TM110 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 centre 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 pro- ducing an acceptable result relative to dual-mode filters. By utilizing a bandpass filter in accordance with the present invention, a weight and volume saving can be achieved over comparable dual-mode bandpass filters. Previous dual-mode allpass networks are not capable of producing equal response characteristics as triple-mode allpass networks in accordance with the present invention.
451812
Com Dev Ltd.
Schnurr Daryl W.
LandOfFree
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