DC Variable Harmonic Pass Band Operation of AlGaN/GaN Surface Acoustic Wave Devices

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概要

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• We have experimentally studied the DC bias dependent frequency characteristics of surface acoustic wave (SAW) and Sezawa modes and their higher frequency modes up to 3.0 GHz, on AlGaN/GaN film SAW devices with different line widths and spacing ratio. By applying a DC bias signal to input and output interdigital transducer (IDT), the distribution of two-dimensional electron gas (2DEG) near the IDT electrodes is modulated and many pass bands can be observed in a wideband frequency range. These pass bands show interesting DC bias dependent frequency characteristics. In particular, pass bands at 1.92 and 2.1 GHz show remarkable ON/OFF switch operation in a DC bias voltage range from 0 to $-20$ V. Compared with AlGaN/GaN films SAW devices with the same line width to spacing ratio, ITD electrodes with different line width to spacing ratios are very effective for obtaining a good higher-mode-frequency response.

• 2008-09-25

著者

• Nishimura Kazumi

  NTT Photonics Laboratories

• Shigekawa Naoteru

  Ntt Photonic Lab. Kanagawa Jpn

• Koh Keishin

  Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi, Kanagawa 243-0292, Japan

• Hohkawa Kohji

  Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi, Kanagawa 243-0292, Japan

• Nishimura Kazumi

  NTT Photonic Laboratories, 3-3-18 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198, Japan

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