Surface acoustic wave filter and method,申请号US19940205472-传众专利搜索

Surface acoustic wave filter and method

申请公布号：US5463361(A)

申请号：US19940205472

申请日期：1994.03.04

申请公布日期：1995.10.31

申请人：

MOTOROLA, INC.

发明人：ALLEN, DONALD E.

分类号：H03H9/145;H03H9/64;(IPC1-7):H03H9/64

主分类号：H03H9/145

摘要：An electronic apparatus for receiving and filtering high frequency waves comprises a sequence of T electro-acoustic transducers each having multiple interdigital electrode fingers and a centerline located equidistant between its outermost electrode fingers. For a centerline-to-centerline distance of a first adjacent pair of transducers D1, and centerline-to-centerline distances of other adjacent pairs of transducers D2 to DT-1, then at least some of D2 to DT-1 differ from D1 by a non-integral number of wavelengths. The transducer array is symmetrical about a centerline and the number of fingers in each transducer varies, with an input or output transducer closer to either end of the sequence having more fingers than a like kind transducer nearer the center.