Guenter Martin and Bert Wall
ABSTRACT As a continuation of the activities concerning longitudinal and transverse modes, this 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.
1999 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control Vol. 46, pp. 257-261, 1999
© 1999, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.