Analysis and optimization of parameters of fanned surface acoustic wave transducers
Abstract
The radiation conductance of interdigital surface acoustic-wave (SAW) transducers employing fan-shaped finger placement is examined. An expression is derived for the active component of the radiation conductance using the approximation of the normal components of the electrical field. The expression derived agrees with the existing formula for the active component of the radiation conductance of a nonapodized SAW filter with an aperture equal to half the width of the acoustic beam emitted by the transducer. Conversion losses are analyzed as a function of the parameters of fanned interdigital transducers. Expressions are derived for the optimum aperture for which center-frequency losses are minimal. The use of fanned SAW filters to realize a given phase-frequency characteristic is promising.
- Publication:
-
USSR Rept Electron Elec Eng JPRS UEE
- Pub Date:
- January 1985
- Bibcode:
- 1985RpEEE.......22Z
- Keywords:
-
- Electric Fields;
- Optimization;
- Sound Transducers;
- Surface Acoustic Wave Devices;
- Analog To Digital Converters;
- Linear Filters;
- Phase Demodulators;
- Radiation Absorption;
- Signal To Noise Ratios;
- Electronics and Electrical Engineering