Comparative CAD study for the insertion loss of SAW filters

Abstract

In this paper a comparative Computer Aided Design (CAD) study for three different methods is applied for calculating the insertion loss of Surface Acoustic Wave (SAW) filters. These methods include Simpson Approach Technique, Impulse Response Technique and Elemental Electrostatic Charge Technique. Using sophisticated computer programs based on these methods, the frequency response of SAW filters can be tailored to meet the performance expectation in terms of insertion loss, bandwidth, shape factor and out-of-band suppression level. The obtained results are compared with the published experimental results. The interpretation of these obtained results indicates that, SAW filters, along with the developed programs have the possibility to be used for low loss IF and RF filtering in mobile and wireless communication. Moreover, this can be used for low loss filter stages in cordless phone system and will reduce both noise and power. In addition, Single-Phase-Unidirectional-Transducers Transducers (SPUDT) are capable of operating with insertion loss of less than 3 dB.