Quadruple mode filter
First Claim
1. A bandpass filter comprising at least one four mode cavity, with tuning screws and coupling screws arranged in said filter so that said four mode cavity resonates at its resonant frequency in four independent orthogonal modes simultaneously, with any additional cavities to said four mode cavity being immediately adjacent to one another or to said four mode cavity, at least one of any additional cavities being immediately adjacent to said four mode cavity, with any immediately adjacent cavities being coupled to one another and resonating at their resonant frequency, said filter having an input and output.
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Abstract
A quadruple mode bandpass filter has at least one cavity resonating in four independent orthogonal modes simultaneously. Preferably, the filter has two cavities, one cavity being a quadruple mode cavity and the remaining cavity being either a single mode, dual mode, triple mode or quadruple mode cavity. By introducing a resonant feedback coupling into filters of the present invention, the number of transmission zeros produced by the filter is equal to the order of the filter. Previous filters have cavities resonating in either a single, dual or triple mode and the maximum number of transmission zeros is equal to the order of the filter minus two.
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Citations
29 Claims
- 1. A bandpass filter comprising at least one four mode cavity, with tuning screws and coupling screws arranged in said filter so that said four mode cavity resonates at its resonant frequency in four independent orthogonal modes simultaneously, with any additional cavities to said four mode cavity being immediately adjacent to one another or to said four mode cavity, at least one of any additional cavities being immediately adjacent to said four mode cavity, with any immediately adjacent cavities being coupled to one another and resonating at their resonant frequency, said filter having an input and output.
Specification