Bulk wave radiation by group-type-unidirectional-transducers

Author

Rinck, A. ; Wagner, T.C. ; Russer, P.

Author_Institution

Siemens AG, Munich, Germany

fYear

1992

Firstpage

83

Abstract

In the design of broadband low-loss group-type unidirectional transducers (GUDTs) the effect of bulk wave radiation must be considered. It influences the accurate design of the phasing network for the GUDT and increases the insertion loss. In addition, the zeros of the frequency response become less pronounced. The influence of the electrode structure of the GUDT on the cutoff frequency of bulk wave radiation is studied. The ratio of bulk wave radiation to surface wave radiation is calculated for a uniform interdigital transducer (IDT), as well as for an electrode structure of a GUDT on LiNbO₃-128rotYX, LiNbO₃-YZ, and quartz-STX. The effect of bulk wave radiation on the zeros of the frequency response is shown for several adjustments of the phasing network

Keywords

frequency response; losses; surface acoustic wave filters; ultrasonic transducers; 15 to 60 MHz; GUDT; LiNbO₃; SiO₂; broadband low-loss group-type unidirectional transducers; bulk wave radiation; cutoff frequency; design; electrode structure; filter; frequency response; insertion loss; phasing network; quartz; surface wave radiation; uniform interdigital transducer; Cutoff frequency; Electrodes; Equations; Frequency conversion; Frequency measurement; Frequency response; Insertion loss; Research and development; Surface acoustic waves; Surface waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1992. Proceedings., IEEE 1992

Conference_Location

Tucson, AZ

Print_ISBN

0-7803-0562-0

Type

conf

DOI

10.1109/ULTSYM.1992.276059

Filename

276059