PURPOSE: To improve the out-band attenuation and the pass band width characteristic by making the number of electrode pairs of plural input electrodes and plural output electrodes different respectively, and also the number electrode pairs between the plural input electrodes and the plural output electrodes different.
CONSTITUTION: A multi-electrode structure surface acoustic wave element is formed in which plural input electrodes 2 and plural output electrodes 3 comprising regular interdigital electrodes are arranged alternately on a piezoelectric substrate 1 and a strip reflector 4 is provided to both outermost sides and the number of electrode pairs of the plural input electrodes 2 and plural output electrodes 3 is made different from each other, and the number of electrode pairs between the plural input electrodes 2 and the plural output electrodes 3 is made different. Thus, the out-band attenuation and the pass band width characteristic are considerably improved.
IGATA OSAMU
MIYASHITA TSUTOMU
TAKAMATSU MITSUO
MATSUDA TAKASHI
| JPS58154917A | 1983-09-14 | |||
| JP54345055A | ||||
| JPS6482706A | 1989-03-28 | |||
| JP51113342B |