| 摘要 |
PROBLEM TO BE SOLVED: To effectively offset noise in a transmission line from the output in a four-port SAW device wherein two DMS resonators having a third reflector between two IDTs along a SAW propagation direction are connected electrically in parallel on the same piezoelectric substrate. SOLUTION: The electric capacity of the reflector parts 7b and 12b of a first reflector connected to one input side crossed-finger electrode 5a and 10a of respective input side IDTs 5 and 10 constituting a first input route and the electric capacity of the third reflector 14 connected to the other input side crossed-finger electrode 5b and 10b of the respective input side IDTs constituting a second input route are equalized, and the electrical symmetry of the two input routes is improved. COPYRIGHT: (C)2007,JPO&INPIT
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