The reflectors of the surface acoustic wave (SAW) filters affect the filter performance, such as the insertion loss. The Cascade-Matrix-Transform Method provides a solution for the trivial calculation of the reflection of the surface acoustic wave (SAW) filters. It is easy to combine the multiple-reflection effect and propagation attenuation by arranging the cell matrix. The results show the effects of number of reflectors and the optimal ratio of the grating period to wavelength. The appropriate grating period is the half wavelength of the operating frequency with an optimal value of number of reflectors. The whole reflection of grating filters with different reflection coefficients at different frequencies in conjunction with the physical explanation of multiple reflection effects are disclosed in this paper. This methodology can also be extended to other further grated type filters, such as microwave filters or optical filters.

Date Published: 17 October 2001
PDF: 7 pages
Proc. SPIE 4581, Passive Components and Transmission Systems, (17 October 2001); doi: 10.1117/12.445023

Published in SPIE Proceedings Vol. 4581:
Passive Components and Transmission Systems
Chongcheng Fan; Norman S. Kwong, Editor(s)