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US07026890B2 Duplexer with a ladder filter and a multimode filter on the same substrate 失效
带有梯形滤波器的双工器和同一基板上的多模滤波器

Duplexer with a ladder filter and a multimode filter on the same substrate
摘要：
A duplexer includes a ladder filter and a multimode filter that are formed on the same surface of a predetermined substrate. In this duplexer, a first comb-like electrode of the ladder filter and a second comb-like electrode of the multimode filter have the same layer structure with the same film thickness. The first comb-like electrode and the second comb-like electrode are formed with single-layer films mainly containing aluminum. The relationship among the film thickness h of the first comb-like electrode and the second comb-like electrode, the center frequency f1 of the frequency band of the ladder filter, and the center frequency f2 of the frequency band of the multimode filter, is expressed as: 300≦h×f1≦480 300≦h×f2≦430.
摘要（中）：

双工器包括形成在预定基板的相同表面上的梯形滤波器和多模式滤波器。 在该双工器中，梯形滤波器的第一梳状电极和多模滤波器的第二梳状电极具有相同的膜厚度的相同的层结构。 第一梳状电极和第二梳状电极由主要含有铝的单层膜形成。 第一梳状电极和第二梳状电极的膜厚h与梯形滤波器的频带的中心频率f 1 1和中心频率f 2 表示为：<？in-line-formula description =“In-line Formulas”end =“lead”？> 300 <= hxf <1> / SUB> <= 480 <？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> 300 <= hxf <= 430。<？in-line-formula description =“In-line Formulas”end =“tail”？>

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