Acoustic wave branching filter having transmitting filter...

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

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C333S193000

Reexamination Certificate

active

06911878

ABSTRACT:
A surface acoustic wave filter includes an antenna terminal, a transmitting filter and a variable branching line both of which are coupled to the antenna terminal and a receiving filter coupled to the variable branching line. The transmitting filter has a first end series-arm SAW resonator, a second end series-arm SAW resonator, a middle series-arm SAW resonator coupled between the first and second end series-arm SAW resonators and parallel-arm SAW resonators. Each of the first and second end series-arm SAW resonator has a first resonance frequency. The middle series-arm SAW resonator has a second resonance frequency that is higher than the first resonance frequency.

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patent: 06-029779 (1994-02-01), None
patent: 10-303682 (1998-11-01), None

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