Title :
Design of phase shifters for a group type unidirectional transducer based on interaction analysis
Author :
Nogami, H. ; Shiba, T. ; Noro, Y. ; Yuhara, A.
Author_Institution :
Hitachi Ltd., Yokohama
Abstract :
A group-type unidirectional transducer (GUT) is useful for a low-loss surface acoustic wave (SAW) filter. The multiport network expressions for the GUT are presented, and interaction between the inphase and quadrature electrodes is studied analytically. The conditions for perfect unidirectivity are described. The design procedures of the phase shifters realizing perfect unidirectivity are shown both in series and parallel configurations for any geometrical phase except π
Keywords :
design engineering; multiport networks; phase shifters; surface acoustic wave filters; ultrasonic transducers; GUT; design procedures; group type unidirectional transducer; interaction analysis; low loss SAW filter; multiport network expressions; parallel configurations; perfect unidirectivity; phase shifters; series configuration; surface acoustic wave; Electrodes; Equivalent circuits; Impedance; Phase shifters; Surface acoustic waves; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234150
