A Design for SAW-Filters with Multistrip Couplers

Abstract

An improved design of SAW-filters with a multlstrlp coupler, two weighted transducers and minimum length is presented. The desired frequency response is approximated by a FIR-filter. Using llnear programming techniques a smooth passband is obtained. This frequency response is shared out to both transducers by the z ero separation method. The difference between their responses is minimized allowing asymmetric time functions. Finally a procedure to compensate for circuit and diffraction effects is proposed.