Simultaneous coupling bandpass filter and method

Details Simultaneous coupling bandpass filter and method Simultaneous coupling bandpass filter and method

1996-04-30

1997-12-16

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333129, H01P 1208, H01P 1213

Patent

active

056990294

ABSTRACT:
A high performance bandpass filter is produced by adding one or more "simultaneous couplings" to a conventional resonant cavity filter. A "simultaneous coupling" is created when a filter's input or output signal, normally coupled to a filter's first or last cavity respectively, is coupled to one or more other cavities. Each simultaneous coupling causes a finite-frequency insertion loss pole to be created, which produces a quasi-elliptic frequency response on its side of the passband. These poles may be placed on the left and/or right sides of the passband, so that both symmetric and asymmetric quasi-elliptic frequency responses are realizable. A diplexer constructed from two such bandpass filters has the extremely sharp selectivity provided by two asymmetric bandpass filters, thus providing a high degree of receive/transmit isolation.

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D. Fink and D. Christiansen, Electronic engineer's Handbook, McGraw-Hill Book Company, 1989, pp. 12-5 through 12-8, and 12-29 through 12-30.
I. Bahl and P. Bhartia, Microwave Solid State Circuit Design, John Wiley & Sons, 1988, pp. 271-276.

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