A Simulation Design of Band1 Saw Duplexer

This paper describes the design and simulation of a small volume, low insertion loss, and high isolation Band1 SAW duplexer. Compared to mainstream Band1 SAW Duplexer, for example Murata SAYEY1G95HA0F0A, our simulation results show that the design enables a package size reduction of ~25%, with the length and width shortened by 200 microns respectively. The design has a similar 1.8dB insertion loss and a superior 60dB isolation. Exacerbation of internal electromagnetic coupling on the performance caused by the reduction of package size is successfully resolved with iterative optimization of the PCB layer and main circuit structure. This compact Band1 SAW duplexer design has the potential to meet the more and more stringent size requirement of radio frequency communication in future mobile devices.