Interdigital transducers with control gates on AlGaN/GaN heterostructures

Naoteru Shigekawa, Kazumi Nishimura, Tetsuya Suemitsu, Haruki Yokoyama, Kohji Hohkawa

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


We investigated surface acoustic wave (SAW) filters composed of interdigital transducers with control gates formed on AlGaN/GaN heterostructures. The contribution of SAWs appeared in the rf characteristics of the SAW filters when reverse-bias voltages were applied to the control gates and the GaN channels were depleted. We also observed higher-frequency signals due to SAWs in transducers with positively-biased control gates. These results suggest that SAW-based functional devices are achievable by employing transducers in which rf signals for exciting SAWs and control signals for modulating SAW properties are applied to different terminals.

Original languageEnglish
Article number033501
JournalApplied Physics Letters
Issue number3
Publication statusPublished - 2006


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