1J5-3 変調IDTを用いたCu電極/15°YX-LiNbO_3基板構造広帯域DMSフィルタ(バルク波デバイス/弾性表面波デバイス)

概要

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This paper discusses the application of Cu-grating/15°YX-LiNbO_3(15-LN)-substrate structure to the development of wideband Double-Mode SAW (DMS) filters. This structure seems suitable for the current purpose because of its distinctive features such as extremely large electromechanical coupling factor (circa 30%) and small attenuation with propagation. We applied the pitch modulation technique for the design of IDTs to arrange multiple resonances properly. This arrangement is essential for the realization of flat and wide passband. The result indicates relative bandwidth more than 12% and good out of band rejection are simultaneously achievable. A DMS filter was fabricated on Cu-grating/15-LN substrate. The measured result agreed well with the design, and the passband width of 11.9% and the minimum insertion loss of 1.7 dB were obtained at 900 MHz range.
超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会の論文
2008-11-11