Monolithic crystal filter having a passband symmetrical...

Details Monolithic crystal filter having a passband symmetrical... Monolithic crystal filter having a passband symmetrical...

H - Electricity

03

H

333/61

H03H 9/56 (2006.01) H03H 9/54 (2006.01)

Patent

CA 1125397

Abstract A monolithic crystal filter includes a monolithic crystal filter element, a capacitive network connected in series with the monolithic crystal filter element and a bridging capacitor connected across the monolithic crystal element and the capacitive network. The monolithlc crystal filter provides a passband that is symmetrically located about the passband center frequency. The monolithic crystal filter element has two pairs of electrodes that resonate at substantially the same frequency. The resonating frequen- cies of the electrode pairs are preferably below the passband center frequency. The capacitive circuit raises the resonating frequency of one of the electrode pairs such that the geometric mean of the raised and non-raised electrode-pair frequencies is substantially the same as the passband center frequency. The monolithic crystal filter can be cascaded with one or more similar monolithic crystal filters or monolithic crystal filter elements to obtain greater selectivity.

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