A surface transverse wave (STW) 2-port asynchronous resonator on BT-cut (-50.5u000b0;YX90u000b0;) quartz was fabricated, measured, and calculated. At a frequency of about 332.4 MHz, insertion loss, and loaded and unloaded quality factors of about 11 dB, 8,000, and 11,500, respectively, were achieved. A turnover temperature of about 20u000b0;C and a quadratic frequency-temperature coefficient of approximately -15 ppb/u000b0;C2 were obtained. Compared with STW resonators on AT-cut quartz (36u000b0;YX90u000b0;), this temperature coefficient is about 4 times smaller, and about 2 times smaller than that for SAW on an ST cut. STW resonators and filters on BT-cut quartz can be used in applications requiring improved temperature stability.
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