公开(公告)号：US4281301A

公开(公告)日：1981-07-28

申请号：US74694

申请日：1979-09-12

申请人： Richard Stevens ,  Richard F. Mitchell ,  Philip D. White

发明人： Richard Stevens ,  Richard F. Mitchell ,  Philip D. White

IPC分类号： H03H9/25 ,  H03H3/08 ,  H03H9/02 ,  H03H9/64

CPC分类号： H03H9/6473 ,  H03H9/02779 ,  H03H9/6436 ,  H03H9/6459 ,  H03H9/1455

摘要： In an acoustic wave device having a pair of spaced apart reflectors forming a resonant cavity, each reflector consists of an array of parallel reflective elements. At least one of the reflectors is weighted not by simple withdrawal of reflecting elements from a nominal uniform array but instead by substituting reflective elements of the uniform array with elements providing both net-zero reflection at required positions and also at least partial compensation for the velocity perturbation which would be produced by such simple withdrawal. Such weighting may be used to suppress the side lobes of the reflector response and hence improve the stopband performance of the acoustic wave device and, for example, a coupled resonator filter in which that device is incorporated.

摘要翻译： 在具有形成谐振腔的一对间隔开的反射器的声波装置中，每个反射器由平行的反射元件阵列组成。 反射器中的至少一个不是通过从标称均匀阵列简单地撤回反射元件来加权，而是通过用在所需位置提供净零反射的元件代替均匀阵列的反射元件，并且还对速度进行至少部分补偿 这种简单撤回将产生扰动。 可以使用这种加权来抑制反射器响应的旁瓣，并且因此改善声波装置和例如其中结合有该装置的耦合谐振滤波器的阻带性能。

公开(公告)号：US4254387A

公开(公告)日：1981-03-03

申请号：US947141

申请日：1978-09-29

申请人： Martin Redwood ,  Richard Stevens ,  Philip D. White ,  Richard F. Mitchell

发明人： Martin Redwood ,  Richard Stevens ,  Philip D. White ,  Richard F. Mitchell

IPC分类号： H03H9/145 ,  H03H3/08 ,  H03H9/02 ,  H03H9/25 ,  H03H9/64

CPC分类号： H03H9/6436 ,  H03H9/02842 ,  H03H9/25

摘要： An acoustic wave resonator device comprises a substrate carrying a pair of spaced apart reflectors forming a resonant cavity that supports only three adjacent distinct resonant mode frequencies. An interdigital transducer is disposed on the substrate between the reflectors and includes an array of electrodes symmetrically arranged relative to a central point of the cavity to form a plurality of electrode pairs with the electrodes of each pair equally spaced on opposite sides of the central point. The central point of the cavity coincides with a node or an anti-node of the standing wave. If the two electrodes of each electrode pair are connected to the same terminal then the transducer has zero net coupling with one set of alternate modes of the cavity, whereas if said two electrodes are connected to opposite terminals then the transducer has zero net coupling with the other set of alternate modes.

摘要翻译： 声波谐振器装置包括承载一对间隔开的反射器的基板，其形成仅支撑三个相邻的不同谐振模式频率的谐振腔。 叉指换能器设置在反射器之间的基板上，并且包括相对于腔的中心点对称地布置的电极阵列，以形成多个电极对，每对的电极在中心点的相对侧上等间隔开。 腔的中心点与驻波的节点或反节点重合。 如果每个电极对的两个电极连接到相同的端子，则换能器与空腔的一组交替模式具有零网络耦合，而如果所述两个电极连接到相对的端子，则换能器具有零网络耦合 其他一组备用模式。