Novel Surface Transverse Wave Resonators with Low Loss and High Q

Surface transverse wave (STW) resonator devices have been designed and fabricated on rotated Y cuts of quartz, with wave propagation perpendicular to the X axis. Packaged devices with center frequencies of 500 and 632 MHz show insertion loss less than 6 d B in a 50 ohm system. Unloaded Q is typically greater than 10,000. Devices at 1726 MHz show packaged insertion loss as low as 10 dB and unloaded Q as high as 5600. Temperature behavior was studied. STW resonators were found to exhibit significantly greater power-handling ability than SAW resonators with comparable design parameters and electrical performance in a comparison study. Device phase noise measurements indicate that STW resonators' noise improves when driven with high incident power. Single sideband device phase noise less than -135 dBc/Hz at 1 H z offset was achieved.

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