Design and performance of SAW-resonators and resonator-filters

One-, two- and three-port SAW resonators on ST-quartz and YZ-lithium niobate were developed employing aluminum metallization. Investigations were carried out on the important parameters for the design of SAW resonators, such as the reflection coefficient, number of reflector elements, reflector and transducer placement, and terminating impedance. Out of the many possible different designs the most promising ones are described in detail: control of the center frequency, permanant trimming to the final frequency by sputtering of thin films and in situ measurement, electronic tuning by means of varactors, low loss, series operation of several devices giving up to 100 db sidelobe signal suppression, multimode operation, and oscillators with single- and multiple-mode resonators, respectively.