MULTIPLEXER

Abstract: a multiplexer includes first and second filters respectively with a first pass band and a second pass band on a higher frequency side than the first pass band. the first filter includes series-arm resonators and parallel-arm resonators, a resonance band width of at least one of the series-arm resonators is wider than the first pass band, one of the series-arm resonators is coupled closest to a common terminal among the series-arm resonators and the parallel-arm resonators. an anti-resonant frequency of the one of the series-arm resonators is lower than a high frequency end of the second pass band and is lowest among anti-resonant frequencies of the series-arm resonators.

Inventor(s): Motoki OZASA

CPC Classification: H03H9/605 (IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (measuring, testing ; arrangements for producing a reverberation or echo sound ; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, ; control of amplification, e.g. bandwidth control of amplifiers, ; tuning resonant circuits, e.g. tuning coupled resonant circuits, ; networks for modifying the frequency characteristics of communication systems ))

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