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公开(公告)号：US20110084780A1
公开(公告)日：2011-04-14
申请号：US12844171
申请日：2010-07-27
IPC分类号： H03H9/64
CPC分类号： H03H9/14505 , H03H9/0066 , H03H9/0285 , H03H9/14588 , H03H9/14591 , H03H9/14597
摘要： The filter includes at least one acoustic track formed on a piezoelectric substrate. At least one SAW input transducer and at least one SAW output transducer are arranged in each track. Each track has a RSPUDT structure and thus a distributed excitation. The excitation function includes sources arranged in a main lobe and a tail function including at least one tail lobe. A fine and precise approximation to the desired continuous excitation function is obtained by decreasing the excitation strength in the tail function by a factor of at least 2.
摘要翻译： 滤波器包括形成在压电基板上的至少一个声轨迹。 在每个轨道中布置至少一个SAW输入换能器和至少一个SAW输出换能器。 每个轨道具有RSPUDT结构，因此具有分布式激励。 励磁功能包括设置在主瓣中的源和包括至少一个尾叶的尾部功能。 通过将尾部功能中的激发强度降低至少2倍，获得对期望的连续激发功能的精确和精确的近似。
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公开(公告)号：US08049582B2
公开(公告)日：2011-11-01
申请号：US12844171
申请日：2010-07-27
CPC分类号： H03H9/14505 , H03H9/0066 , H03H9/0285 , H03H9/14588 , H03H9/14591 , H03H9/14597
摘要： The filter includes at least one acoustic track formed on a piezoelectric substrate. At least one SAW input transducer and at least one SAW output transducer are arranged in each track. Each track has a RSPUDT structure and thus a distributed excitation. The excitation function includes sources arranged in a main lobe and a tail function including at least one tail lobe. A fine and precise approximation to the desired continuous excitation function is obtained by decreasing the excitation strength in the tail function by a factor of at least 2.
摘要翻译： 滤波器包括形成在压电基板上的至少一个声轨迹。 在每个轨道中布置至少一个SAW输入换能器和至少一个SAW输出换能器。 每个轨道具有RSPUDT结构，因此具有分布式激励。 励磁功能包括设置在主瓣中的源和包括至少一个尾叶的尾部功能。 通过将尾部功能中的激发强度降低至少2倍，获得对期望的连续激发功能的精确和精确的近似。
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