Title :
A four-pole SAW resonator filter combining transverse and symmetrical longitudinal modes
Author :
Martin, G. ; Wall, B.
Author_Institution :
Inst. fur Festkoerper- und Wekstofforschung, Dresden, Germany
Abstract :
As a continuation of the activities concerning longitudinal and transverse modes, the present paper describes the combination of transverse and neighboring longitudinal modes with the same symmetry for designing a four-pole resonator filter. The construction of both interdigital transducers arranged side by side agrees and is characterized by a symmetrical withdrawing weighting. The present solution offers the advantage to achieve a wider bandwidth for the same layout dimensions compared with the principle using neighboring longitudinal modes of different symmetry. The applicability of the principle to the filter design is demonstrated by experimental measurements
Keywords :
interdigital transducers; surface acoustic wave resonator filters; surface acoustic wave transducers; bandwidth; four-pole SAW resonator filter; four-pole resonator filter; interdigital transducers; layout dimensions; symmetrical longitudinal modes; symmetrical withdrawing weighting; symmetry; transverse modes; Band pass filters; Bandwidth; Electric potential; Fingers; Frequency locked loops; Passband; Resonance; Resonator filters; Surface acoustic waves; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.662975
