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ABSTRACT: Surface transverse waves (STW) resonators exhibit substantial advantages over conventional surface acoustic wave (SAW) resonators. They demonstrate higher operating frequencies, better temperature stability, higher intrinsic material quality, and etc. In this work, two low loss and high quality factor STW resonators with center frequencies at 622MHz and 1244MHz for SONET/SDH were uniquely designed and fabricated on quartz substrate. The insertion loss of the devices was as low as 3dB, loaded quality factor was as high as 1600, and sidelobe suppression reached 30dB. The temperature behavior of these two resonators were also presented by experiment with turnover temperatures at about 50degC for 622MHz and 20degC for 1244MHz, repectively
Thermal, Mechanical and Multiphysics Simulation and Experiments in Micro-Electronics and Micro-Systems, 2006. EuroSime 2006. 7th International Conference on; 05/2006
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ABSTRACT: This study investigated an improved shear horizontal surface acoustic wave (SH-SAW) ammonia sensor based on L-glutamic acid hydrochloride. In order to satisfy Barkhausen criteria for oscillation and avoid mode hopping, it used coupling of modes (COM) theory to design a SH-SAW resonator. This SH-SAW sensor presented excellent reversibility, sensitivity, and repeatability when ammonia was in the ppb level. According to the signal-to-noise ratio of two, the estimated limit of detection (LOD) is 13.53 ppb.
Frequency Control Symposium and Exposition, 2004. Proceedings of the 2004 IEEE International; 09/2004
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ABSTRACT: Choosing a suitable temperature coefficient of frequency (TCF) and turnover temperature (TOT) of quartz substrate for surface acoustic wave (SAW) resonators is extremely important in designing a highly stable SAW oscillator. In general, TCF and TOT depend on the cut angle of the substrate, the wave propagation direction and the metal thickness of the electrodes. The temperature characteristics of quartz substrates were studied experimentally by investigating high-Q one-port SAW resonators. The substrates covered from Y32°-X to Y37°-X and ST-X. The metal thickness of electrodes covered 1.8%, 3.6% and 5.4%.
Frequency Control Symposium and Exposition, 2004. Proceedings of the 2004 IEEE International; 09/2004
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ABSTRACT: In this paper, the parameters of an equivalent circuit model were derived from the coupling-of-modes theory model. The consistency between two models was confirmed through calculating the characteristics of an interdigital transducer and a reflection grating with metalization ratio at 0.5. The accuracy of the derived equivalent circuit model was proved by comparing the simulation and measurement results of a 400MHz one-port resonator and an 1842.5MHz ladder-type filters, respectively.
Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE; 11/2002
