Acoustic surface wave filter having combined split-isolated...

Details Acoustic surface wave filter having combined split-isolated... Acoustic surface wave filter having combined split-isolated...

H - Electricity

03

H

333/58

H03H 7/01 (2006.01) H03H 9/02 (2006.01) H03H 9/76 (2006.01)

Patent

CA 1048116

ABSTRACT OF THE DISCLOSURE An acoustic surface wave filter has offset transmitting and receiving transducers formed on the wave propagating surface of a piezoelectric substrate. A two-segment multistrip coupler is interposed on the propagating surface and provides "track switching" or "sidestepping" action for signals within the coupler passband. The coupler includes a split-connected portion formed by electrically connected filamentary conductor pairs and a split-isolated portion formed by electrically continuous filamentary conductors and interleaved conductors having a discontinuity at their center. The spit-connected portion attenuates the symmetrical mode components of acoustic waves within the coupler stop band while the split-isolated portion attenuates the anti-symmetrical mode portion of acoustic waves within the coupler stop band, producing an improved trap response. - 1 -

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