Surface elastic wave device

Details Surface elastic wave device Surface elastic wave device

H - Electricity

03

H

333/29, 349/59.1

H03H 9/145 (2006.01)

Patent

CA 1276284

ABSTRACT OF THE DISCLOSURE A surface acoustic wave (SAW) device comprises a piezo-electric surface acoustic substrate, and plural sets of input/output interdigital electrodes disposed on the substrate. A phase shifter is provided between a sending electrode and a reflecting electrode included in the input or output interdigital electrodes for producing an electrical phase difference to implement a unidirec- tional electrode. The sending electrode and the reflect- ing electrode are mutually connected through the phase shifter including two pure reactance elements serially connected between the sending and the reflecting electrodes and a pure reactance element connected to the junction between the two serially connected reactance elements so as to form a T - circuit. When the two serially connected pure reactance elements are selected equal to each other, the operating frequency band is broadened. The phase shifter includes no ohmic resistance and thus is lossless.

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