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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Small and low-loss IF SAW filters using zinc oxide film on quartz substrate
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Small and low-loss IF SAW filters using zinc oxide film on quartz substrate

机译：如果在石英基板上使用氧化锌膜的滤光器，则小而低损耗

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摘要

It was previously reported that a Rayleigh wave propagating on a zinc oxide film (ZnO)/ST-cut 35/spl deg/X propagation quartz substrate structure has the characteristics of an excellent temperature coefficient of frequency (TCF) and a large electromechanical coupling factor k.. This substrate was applied to various intermediate-frequency (IF) stage filters. During the filter development, it was clarified that a spurious response due to the Love wave was generated. In this study, a new quartz substrate has been developed with a specific cut and propagation angle, that has the same values of the TCF an(] the coupling factor as the above-mentioned ones. In addition, it does not have the spurious response due to the Love wave. The combination of this specific-cut-angle quartz and ZnO film has been applied to IF filters for wideband code division multiple access (W-CDMA) and narrow-band CDMA (N-CDMA) systems. The insertion losses of their IF filters were 3-5 dB better and their TCF was superior /spl Delta/f/f = 0.37 ppm//spl deg/C: one-third) compared with the conventional surface acoustic wave (SAW) filters.
机译：先前报道，在氧化锌膜（ZnO）/ ST-CUT 35 / SPL DEG / X传播的石英底物结构上传播的瑞利波具有优异的频率温度（TCF）和大型机电耦合因子的特性K ..将该基板施加到各种中间频率（IF）级过滤器上。在过滤过程中，澄清了由于爱波引起的虚假反应。在该研究中，已经开发了一种具有特定切割和传播角度的新的石英衬底，其具有与上述耦合因子的TCF An（]的相同值。此外，它没有杂散的反应由于爱情波。该特定切割角型石英和ZnO膜的组合已应用于用于宽带码分多次访问（W-CDMA）和窄带CDMA（N-CDMA）系统的滤波器。插入与传统的表面声波（锯）过滤器相比，它们更好的滤波器为3-5 dB，其TCF优于/ SPL DELTA / F = 0.37ppm // SPL DEG / C：三分之一）。

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