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1. 发明授权

US3697903A Equal-resonator piezoelectric ladder filters 失效
标题翻译：平衡共振器压电梯级滤波器
公开(公告)号：US3697903A
公开(公告)日：1972-10-10
申请号：US3697903D
申请日：1968-05-17
申请人： CLEVITE CORP
发明人： SAUERLAND FRANZ L
IPC分类号： H03H9/54 , H03H7/08
CPC分类号： H03H9/542
摘要： Piezoelectric ladder filters with the following characteristics are described: A. The filter selectivity may be changed without changing the resonators and without requiring the frequencies of peak insertion loss to be changed. This type of filter will be referred to as ''''equal-resonator filter.'''' B. Except for the restrictions on the series resonant frequency of the shunt resonators and the anti-resonant frequency of the series resonators, the remaining resonator parameters are largely, within a range that will be explained, independent of the filter selectivity. This permits use of predetermined resonators for the design of filters with different selectivity characteristics. It includes filters where all the series resonators and all shunt resonators, respectively, are equal, as well as filters in which all the resonators are identical with each other. The latter type will be called ''''identical resonator'''' filters.
摘要翻译：描述了具有以下特性的压电梯形滤波器：

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