1.9-GHz-Band Surface Acoustic Wave Device Using Second Leaky Mode on LiTaO3
| Title: | 1.9-GHz-Band Surface Acoustic Wave Device Using Second Leaky Mode on LiTaO3 |
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| Authors: | Yasumi Kobayashi, Yasumi Kobayashi, Naoki Tanaka, Naoki Tanaka, Kuniyuki Matsui, Kuniyuki Matsui, Hiroshi Okano, Hiroshi Okano, Tatsuro Usuki, Tatsuro Usuki, Kenichi Shibata, Kenichi Shibata |
| Source: | Japanese Journal of Applied Physics; May 1996, Vol. 35 Issue: 5 p2987-2987, 1p |
| Abstract: | The propagation characteristics of a new high-phase-velocity leaky surface acoustic wave (SAW) mode, which is called the second leaky mode, in a periodic structure on LiTaO3(90°, 90°, 31°) aere analyzed experimentally. The propagation loss is the lowest when the KH(K=wave number, H=Al electrode thickness) parameter is about 0.5. The higher mode of the second leaky mode is excited when the KHparameter is larger than 0.7. A ladder type band-pass SAW filter utilizing the second leaky mode on LiTaO3was designed and fabricated by applying the analysis results to the periodical structure. The pitch of the electrode fingers is 0.8 µ m. The center frequency of the pass band is 1.938 GHz. The minimum insertion loss is 3.3 dB. The attenuation at the center frequency ±100 MHz is 25 dB. The measured characteristics of this filter can be sufficient for practical mobile communication systems. |
| Database: | Supplemental Index |
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