| Summary: | 碩士 === 義守大學 === 電機工程學系 === 92 === In recent years, the mobile communication systems such as cellular phone, wireless network card, and wireless internet in Notebook have become very widespread and important to personal communication and business. Surface acoustic wave (SAW) filters have played an important role as a key device in mobile phone systems. For the requirements for intermediate frequency (IF) filters, SAW filters have to present low center frequency, narrow bandwidth, high rejection out of band, low insertion loss, and small size. This work investigated the transverse coupled resonator filter (TCF), which has been operated in a rang of 100MHz and 500MHz. The characteristics of TCF includes narrow bandwidth, high rejection out of band, and insertion losses well below 10dB.
The substrate, thickness of metal film, pairs and aperture of interdigital transducers (IDTs), and numbers of reflectors determine the characteristics of TCF. ST-X quartzs was used as the substrate in this work. The performances of TCF were simulated by using coupling-of-modes (COM) theory, and Matlab software was employed to analyze the characteristics. The simulation results were proved experimentally.
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