Multiple pole bandpass filter having monolithic crystal...

Details Multiple pole bandpass filter having monolithic crystal... Multiple pole bandpass filter having monolithic crystal...

H - Electricity

03

H

333/60

H03H 9/205 (2006.01) H03H 9/56 (2006.01) H03H 9/58 (2006.01)

Patent

CA 1112726

ABSTRACT A symmetrical two pole monolithic crystal filter is combined with appropriate value fixed capacitors and cascaded with other similar filter elements to provide a high order filter with symmetrical transmission zeros and low passband ripple. The filter includes a piezoelectric resonating ele- ment having first and second opposite sides with first and second pairs of electrodes thereon. A first capacitor is coupled to an electrode of the first pair located on the first side and a second capacitor is coupled to an electrode of the second pair of the electrodes located on the first side. A shunting capacitor is used between the electrodes of the first and second pairs located on the first side. A fourth capacitor is coupled from both of the first and second electrodes located on the second side.

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