Surface acoustic wave duplexer composed of SiO2/Cu electrode/LiNbO3 structure having convex and concave portions

Yasuharu Nakai, Takeshi Nakao, Kenji Nishiyama, Michio Kadota

研究成果: Article査読

10 被引用数 (Scopus)


The transition bandwidth of 20MHz between the transmission (Tx: 1850-1910MHz) and the receiving (Rx: 1930-1990MHz) bands of personal communication service (PCS) handy phones in the United States (US) is very narrow compared with those of other systems. We have already realized surface acoustic wave (SAW) duplexers with sizes of 5.0 × 5.0 × 1.7 and 3.0 × 2.5 × 1.2 mm3 for PCS handy phones in the US with an excellent temperature coefficient of frequency (TCF) by using a shear horizontal (SH) wave on a flattened SiO2/Cu electrode/36-48° YX-LiTaO 3 structure and a Rayleigh wave on a SiO2/Cu electrode/120-128° YX-LiNbO3 structure. Although the surface of the above-mentioned structures is flattened SiO2, we have also studied the shape of the SiO2 surface. As a result, in addition to increasing the stop-band width, which corresponds to the reflection coefficient, the TCF and power durability have been improved by forming convex portions on the surface of the SiO2 over the interdigital transducer (IDT) gaps.

ジャーナルJapanese journal of applied physics
7 PART 2
出版ステータスPublished - 2009 7 1

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)


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