Precise design technique of SAW transversely coupled resonator filters on quartz

The design of transversely coupled SAW resonator filters is more complex than conventional SAW´s because of its two dimensional nature. Previously, an innovative COM modeling technique for TCF´s was proposed along with the method of experimentally determining the COM and electrostatic parameters necessary for the model. In this paper detailed design examples are given which are based on this modeling technique and the parameter database. The paper gives all design information (number of electrodes, beam width, grating and transducer periods, etc.) and corresponding COM model parameters. Also, the complete measured and predicted electric performances are presented. An excellent agreement is found between the theoretical predictions and the experiments over a wide frequency range. As a practical design tool this approach has shown an excellent accuracy and high efficiency for optimum design procedures