DocumentCode
914938
Title
Narrow-bandwidth Rayleigh-wave filters
Author
Hartemann, P.
Author_Institution
Thomson CSF, Laboratoire Central de Recherches Domaine de Corbeville, Orsay, France
Volume
7
Issue
22
fYear
1971
Firstpage
674
Lastpage
675
Abstract
In order to obtain a 50 kHz bandwidth at 102 MHz with an interdigital delay-time filter, the transducers are made of a succession of elementary combs separated by an integer multiple of the acoustical wavelength. The frequency response of such a filter having two identical transducers consists of a sequence of transmission peaks, each having a bandwidth of about 50 kHz. When the two transducers are not identical, it is possible to obtain a frequency response with a small number of peaks. Such a filter is obtained when the spacing between adjacent elementary combs of each transducer is a different integer multiple of the acoustical wavelength. The design of several filters is described and some measured characteristics are presented.
Keywords
filters; ultrasonic transducers; Rayleigh wave filters; frequency response; interdigital delay time filter; narrow bandwidth; sonic transducers;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19710460
Filename
4235364
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