Title :
Design of SAW filters with two apodised in-line tranducers on quartz
Author :
Renger, J. ; Wall, B.
Author_Institution :
Vectron International, Teltow, Germany
Abstract :
The design of SAW filters on quartz consisting of two apodised in-line interdigital transducers (IDT) without using multistrip coupler is presented. The analytical model is described by taking into account two-dimensional static charge distribution, surface wave diffraction and the influence of the external network. A wideband diffraction compensation method is applied to compensate these second-order effects. The design optimisation criteria of the two apodised in-line IDTs are presented. The theoretical and experimental frequency responses of a filter are shown
Keywords :
acoustic imaging; acoustic wave diffraction; circuit optimisation; compensation; equivalent circuits; frequency response; interdigital transducers; quartz; surface acoustic wave resonator filters; 2D static charge distribution; SAW filters; SiO2; analytical model; apodised in-line tranducers; design optimisation; frequency response; in-line IDT; in-line interdigital transducers; multistrip coupler; second-order effects; surface wave diffraction; wideband diffraction compensation; Admittance; Design optimization; Diffraction; Equivalent circuits; Fingers; Frequency response; SAW filters; Surface acoustic waves; Surface waves; Transducers;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841450
