Surface elastic wave filter

Details Surface elastic wave filter Surface elastic wave filter

Category

H - Electricity

Subcategory

03

Subsubcategory

H

CPC

333/58

IPC codes

H03H 9/64 (2006.01)

Type

Patent

Patent number

CA 2015227

Description

ABSTRACT OF THE DISCLOSURE A surface elastic wave filter includes a plurality of input interdigital transducers for receiving a high- frequency input signal, and a plurality of output inter- digital transducers for producing an output signal derived from the input signal and having predetermined frequency characteristics. Each of the input and output interdigital transducers having a pair of confronting connectors for receiving the input signal and extracting the output signal, respectively, and a pair of groups of interdigitating elec- trode fingers extending from the connectors. The input and/or output interdigital transducers include finger- withdrawn interdigital transducers with electrode fingers selectively withdrawn in different positions. With such withdrawal weighting, the interdigital transducers have dif- ferent sidelobe characteristics, i.e., frequency blocking characteristics, so that the surface elastic wave filter operates with a greater sidelobe suppression. - 25 -

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