Ultrawide-Band Resonators Using Shear Horizontal-Type Plate Wave and Their Application
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概要
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Currently, mobile or smart phones with multibands and a cognitive radio system require a tunable filter with a wide tunable range to simplify their circuits. An ultrawide-band resonator is an important device to realize the tunable filter. The relative bandwidths (BWs) of 12 to 17% of previously reported surface acoustic wave (SAW) resonators are not sufficient to realize the tunable filter. This time, the authors studied an SH<inf>0</inf>mode plate wave in a LiNbO<inf>3</inf>plate. As a result, plate wave resonators with a large electro-mechanical coupling factor (k^{2}) of 0.55 (55%), an ultrawide bandwidth of 29%, a high Q of 700, and a large impedance ratio of 98 dB between resonance (f_{\text{r}}) and anti-resonance (f_{\text{a}}) frequencies were realized for the first time using 27.5--30°YX-LiNbO<inf>3</inf>plates. Applying these resonators to a ladder-type tunable filter, a wide tunable range of 19% was obtained.
- 2013-07-25
著者
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Kadota Michio
Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto 617-8555, Japan
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Kimura Tetsuya
Murata Manufacturing, Co., Ltd., 10-1 Higashikotari 1-chome, Nagaokakyo, Kyoto 617-8555, Japan
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Ogami Takashi
Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto 617-8555, Japan
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