摘要 |
PROBLEM TO BE SOLVED: To provide a means for decreasing ripples in the passband of the cascade connected laterally coupled duplex mode filter of a narrow band. SOLUTION: A part of electrode fingers positioned outside four reflectors of the cascade connected duplex mode filter is separated from the bus bar of reflectors and connected to a lead electrode provided along with the outside of two duplex mode SAW filters and inter-stage parallel capacity is formed.
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