Design of withdrawal weighted transducer SAW filter for RF wireless applications

Abstract

This paper describes the design of SAW device using withdrawal weighted transducer structure for RF band pass Filter. The proposed SAW filter consists of a uniform input IDT and withdrawal-weighted output IDT. The proposed design is intended for improvement of IDT insertion loss by means of a withdrawal weighting (WW) technique. Two different SAW filters structure are modeled. The Comsol Multiphysics is used to compare the output voltages in time domain & frequency domain for both filters and to realize the performance enhancement that is achieved by using the withdrawal weighted transducer.