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发明授权
US07459992B2 Acoustic wave filter and acoustic wave duplexer 失效
声波滤波器和声波双工器

Acoustic wave filter and acoustic wave duplexer
摘要：
An acoustic wave filter includes: a ladder filter that has acoustic wave resonators connected in series and parallel arms; an inductor that is provided between a ground and at least one of the parallel-arm resonators in the ladder filter; and a resonance circuit that is provided in parallel with the inductor, and is located between the ground and the parallel-arm resonators in the ladder filter. In this acoustic wave filter, the resonance frequency of the resonance circuit is expressed as: 2f0−150 MHz
摘要（中）：

声波滤波器包括：具有串联和并联臂的声波谐振器的梯形滤波器; 电感器，其设置在梯形滤波器中的地与至少一个并联臂谐振器之间; 以及与电感器并联设置并且位于梯形滤波器中的接地与并联臂谐振器之间的谐振电路。 在这种声波滤波器中，谐振电路的谐振频率表示为：<？in-line-formula description =“In-line formula”end =“lead”？> 2f0-150 MHz <？in-line-formula description =“In-line formula”end =“lead”？>或<？in-line -formulae description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> 3f0-150 MHz

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