Title :
Mode analysis of longitudinal multi mode SAW resonator filter
Author :
Ichikawa, Satoshi ; Kanasaki, Hiroshi ; Akahori, Naoki ; Koshino, Masayoshi ; Ebata, Yasuo
Author_Institution :
Device Eng. Dept., Toshiba Corp. Display Device & Components Co., Yokohama, Japan
Abstract :
This paper describes the mode analysis for a longitudinal multi mode SAW resonator filter having 5 IDTs between the grating reflectors. The mode analysis is carried out at several conditions and frequencies, focusing on trap response. At the trap canceling condition, two resonant modes coincide in frequency and degenerate. Furthermore, at the fundamental resonant mode, SAW distribution at the center of electrode is distorted to be undulatory. In order to unify the SAW distribution of the fundamental mode, electrode pitches are adjusted partially. The developed balanced DCS-Rx filter realized low insertion loss of under 2 dB successfully
Keywords :
frequency response; interdigital transducers; modal analysis; surface acoustic wave resonator filters; 2 dB; IDTs; SAW distribution; balanced DCS-Rx filter; electrode pitches; fundamental resonant mode; grating reflectors; longitudinal multi mode SAW resonator filter; low insertion loss; mode analysis; trap canceling condition; trap response; Band pass filters; Bandwidth; Displays; Electrodes; Gratings; Impedance; Resonance; Resonant frequency; Resonator filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991588
