一种采用NSPUDT结构的新型滤波器

A Novel Filter Using NSPUDT Structure

利用自然单相单向换能器，可以制作低损耗的声表面波器件。因自然单相单向换能器基片的单向性依赖于晶体的取向，用常规的单指结构就可以获得单向性。为了得到低损耗的滤波器，在相对方向上的接受换能器也设计成单向传输。文中介绍了一种使自然单相单向换能器基片单向性反向传输的新型滤波器结构。

Low loss SAWD can be made by using NSPUDT.The unidirectivity of NSPUDT is dependent on the orientation of substrate,so it can be obtained by single finger structure.In order to obtain a low loss SAWF,it is necessary to make the opposite receiving transducer unidirectional.In this paper,a new transducer configuration reversing the direction of NSPUDT substrate is reported,SAWF experimental results based on this new structure are also given.