A Design of Surface Acoustic Wave Wideband Single-Phase-Unidirectional Transducers Using Coupling-of-Modes Theory

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概要

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• To realize wideband surface acoustic wave (SAW) filters, a weighted single-phase-unidirectional transducer (SPUDT) has been analyzed by direct numerical analysis of the coupling-of-modes equations. It was found that the directivity was obtained over a wide frequency range when the reflection coefficient of the SPUDT was weighted using a sinc function in order to distribute the positive and negative reflection elements into the SPUDT; this was called a wideband SPUDT. This paper also describes a high-performance wideband SPUDT, with both the reflection and transduction coefficients weighted on 128°Y-X LiNbO_3 substrates, and a new wideband natural-SPUDT (NSPUDT) on 50°Y-23°X La_3Ga_5SiO_<14> substrates, which has recently attracted much attention for intermediate frequeuacy (IF) SAW filters.

• 社団法人応用物理学会の論文
• 1999-05-30

著者

• Takeuchi Masao

  Department of Physical Education, Hoshi University School of Pharmacy and Pharmacological Science

• KIMURA Noritoshi

  Advanced Products Development Center, TDK Corporation

• Kimura Noritoshi

  Advanced Products Development Center Tdk Corporation

• Takeuchi Masao

  Department Of Electronic Engineering Tamagawa University

• TAKEUCHI Masao

  Department of Electrical and Electronic Engineering, Ibaraki University

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• Natural Single-Phase Unidirectional Transducer Orientations on Doubly Rotated Y-Cut Langasite Substrates
• A Design of Surface Acoustic Wave Wideband Single-Phase-Unidirectional Transducers Using Coupling-of-Modes Theory

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