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Radio frequency (RF) filters in high frequency using surface acoustic wave (SAW) such as MediaFLOTM, time division synchronous code division multiple access (TDSCDMA) in China handy phone system, and global positioning system (GPS) in cars require a narrow bandwidth. So, the SAW substrates for their RF filters are also required to have a very excellent temperature coefficient of frequency (TCF) and...
This paper discusses a technique to suppress spurious transverse mode responses appearing in ultra-wideband SAW resonators fabricated on a Cu- grating/15degYX-LiNbO3 structure. The basic idea of the technique is inserting length- and width-weighted dummy electrodes between a bus-bar and interdigital electrodes. For practical device design, an analysis was made to show how the profile (field distribution)...
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