Power Flow Angles for Slanted Finger Surface Acoustic Wave Filters on Langasite Substrate

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概要

• 論文の詳細を見る

• Power flow angles (PFAs) on a langasite (LGS) substrate with Euler angles of $(0{\degree}, 138.5{\degree}, \psi)$, $\psi=25.7$ to 27.7° are investigated for slanted finger interdigital transducer (SFIT) surface acoustic wave (SAW) filters by an electrical and optical methods. In the electrical method, several tilted SFIT SAW filters with different tilt angles for $(0{\degree}, 138.5{\degree}, \psi)$ LGS substrates were designed, and the frequency responses of the filters were measured. In the optical method, the PFAs were directly measured by optical probing for a parallel interdigital transducer (IDT) with wide propagation area on the substrate. As a result, a good correlation between electrical and optical measurements of the PFAs is obtained, but the calculated PFAs are slightly different from the measured PFAs. A good frequency response of a tilted 380 MHz SFIT SAW filter with an appropriate tilt angle corresponding to the PFA on the substrate is obtained even though the aperture is small.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2007-07-30

著者

• CHIBA Takao

  Faculty of Physical Sciences and Engieering, Meisei University

• Yatsuda Hiromi

  Japan Radio Co. , Ltd.

• Chiba Takao

  Faculty of Physical Sciences and Engineering, Meisei University, Hino, Tokyo 191-8506, Japan

• Goto Mikihiro

  Japan Radio Co., Ltd., Fujimino, Saitama 356-0011, Japan

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