Title :
Double-mode SAW filters with improved selectivity
Author_Institution :
His-Rodos Co. Ltd., Minsk, Byelorussia
Abstract :
The present paper focuses on the improvement of the dual-mode SAW (DMS) filter selectivity. The closed-form expressions, based on a simple physical model, are derived to calculate the longitudinally coupled structures of various types (2-pole and 4-pole). Tests characteristics of similar filters demonstrate a good agreement of simulations and measurements. It is shown how the system parameters may be combined to manufacture the DMS filters with an insertion loss less than 3 dB and selectivity over 36 dB
Keywords :
interdigital transducers; modelling; radiofrequency filters; surface acoustic wave filters; 2-pole type; 3 dB; 4-pole type; closed-form expressions; double-mode SAW filters; insertion loss; longitudinally coupled structures; selectivity improvement; system parameters; Acoustic reflection; Bidirectional control; Equations; Frequency; Gratings; SAW filters; Testing; Tin; Transfer functions;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922515
