Ultra-wideband and high frequency resonators using shear horizontal type plate wave in LiNbO3 thin plate
Ultra-wideband and high frequency resonators using shear horizontal type plate wave in LiNbO3 thin plate
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DOI：
10.7567/jjap.53.07kd03
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发表时间：
2014-07-01
影响因子：
1.5
通讯作者：
Tanaka, Shuji
中科院分区：
文献类型：
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作者：
Kadota, Michio;Kuratani, Yasuhiro;Tanaka, Shuji
认知无线电系统需要一个具有宽可调范围的可调滤波器来组成一个简单的前端。由于可调谐范围受谐振器带宽的限制，超宽带谐振器是实现可调谐滤波器的重要器件。作者以前在LiNbO_3板中利用第0模剪切水平(SH0模)板波获得了宽度为26~29%的低频谐振器，在共振频率(f(R))和反共振频率(f(A))之间的大阻抗比为92~98分贝。给出了可调范围为13%的可调谐滤光片。然而，对于现代无线通信来说，频率(f(R)=1.8 MHz和f(A)=2.3 MHz)太低了。此外，由于f(R)和f(A)之间的横模，谐振器受到了波纹的影响。本研究用超薄LiNbO_3板制作了宽频带、大阻抗比的高频SH0模板波谐振器(f(R)=430-560 MHz，f(A)=530-670 MHz)。波纹由变迹叉指换能器抑制。(C)2014年日本应用物理学会
A cognitive radio system requires a tunable filter with a wide tunable range to compose a simple front-end. Because the tunable range is limited by the bandwidth (BW) of resonators, an ultra-wideband resonator is an important device to implement the tunable filter. The authors previously obtained low frequency resonators with a wide BWs of 26 to 29% and a large impedance ratios of 92 to 98 dB between resonance (f(r)) and anti-resonance frequencies (f(a)) using 0-th mode shear horizontal (SH0 mode) plate wave in a LiNbO3 plate. Also, a tunable filter with the tunable range of 13% was demonstrated. However, the frequency (f(r) = 1.8 MHz and f(a) = 2.3 MHz) is too low for modern wireless communication. Also, the resonators suffered from ripples due to transverse mode between f(r) and f(a). In this study, high frequency SH0 mode plate wave resonators (f(r) = 430-560 MHz and f(a) = 530-670 MHz) with a wide bandwidth and a large impedance ratio have been fabricated using an ultrathin LiNbO3 plate. The ripples were suppressed by an apodized interdigital transducer. (C) 2014 The Japan Society of Applied Physics