Phase Linear, Flat Wide Band, Low-Loss Filters Using New Configuration of Unidirectional Up- and Down-Chirp Dispersive Inter Digital Transducers

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概要

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• Dispersive transducers have sharp cut-off and flat wideband frequency characteristics. Also, phase linear and very low-loss characteristics are obtained by combining down- and up-chirp unidirectional dispersive transducers (DUDIST and UUDIDT). We proposed wide band filters combining DUDIDT and UUDIDT using the conventional UDT with the grating thin films. In this case, we could not obtain the low loss results. In this paper, the theoretical results of phase linear, flat wide band and low loss filters using a combinations of the new DUDIDT and UUDIDT are described. DUDIDT and UUDIDT are obtained by using the new configuration of Dispersive IDT. The large unidirectionalities of the DUDIDT and UUDIDT are obtained by changing of the electrode width and thickness, and using the open and short-circuit electrodes as the reflectors.

• 2010-09-25

著者

• Satoh Yusuke

  Department of Electronics and Intelligent Systems, Tohoku Institute of Technology, 35-1 Kasumi-cho, Yagiyama, Taihaku-ku, Sendai 982-8577, Japan

• Yamanouchi Kazuhiko

  Department of Electronics and Intelligent Systems, Tohoku Institute of Technology, 35-1 Kasumi-cho, Yagiyama, Taihaku-ku, Sendai 982-8577, Japan

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• Phase Linear, Flat Wide Band, Low-Loss Filters Using New Configuration of Unidirectional Up- and Down-Chirp Dispersive Inter Digital Transducers

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