Surface transverse wave asynchronous multimode resonator on quartz

A surface transverse wave asynchronous multimode resonator on quartz was designed, fabricated and measured. Grating phase shifters were placed between interdigital transducers and reflectors to obtain the incident and reflected waves in phase, and the centre frequency of the resonator was located near the centre frequency of the reflectors. At a frequency of about 509.6 MHz, insertion loss, and loaded and unloaded quality factors of about 6 dB, 9 000 and 18 000, respectively, were obtained.