Title :
Transformer ratio and capacitance in general form for equivalent circuit of SAW IDTs
Author :
Shiba, Takashi ; Yamada, Jun ; Yuhara, Akitsuna
Author_Institution :
Hitachi Ltd., Yokohama, Japan
Abstract :
The transformer ratio and capacitance in an equivalent circuit for an interdigital surface acoustic wave transducer are presented in general form. The relation between these parameters and the input admittance for one periodic section of the equivalent circuit is calculated. Using these calculated values and the admittance formula of H. Engan (1975), the parameters are finally determined as a function of metallization ratio, harmonic number, and material constants. The results are verified by experiments
Keywords :
acoustic transducers; equivalent circuits; surface acoustic wave devices; SAW IDTs; capacitance; equivalent circuit; harmonic number; input admittance; interdigital surface acoustic wave transducer; material constants; metallization ratio; transformer ratio; Acoustic transducers; Acoustic waves; Admittance; Capacitance; Electrodes; Equivalent circuits; Frequency; Solids; Surface acoustic waves; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234135
