Low-Loss N79 Band SAW Filter with 16.0% FBW Based on 15°Y-X LiNbO3/SiC Structure
IEEE Electron Device Letters(2024)
摘要
Surface acoustic wave (SAW) filters with improved frequency and bandwidth are highly demanded in the 5G system to cater for the high-throughput wireless communication. This work demonstrates a low-loss SAW filter using shear horizontal (SH) mode in 15°
Y-X
LiNbO
3
(LN)/SiC heterostructure, successfully covering full n79 band. Resonators were investigated theoretically and experimentally to optimize the designing parameters of LN film. The measured resonators with varying LN thickness (
h
LN
) exhibit scalable resonant frequencies from 4478 to 5239 MHz with high phase velocity (
V
p
) over 4200 m/s, large coupling coefficient (
K
2
) between 16.0% and 28.3% and near spurious-free response. The fabricated filter shows a center frequency (
f
c
) of 4693 MHz, a 3-dB fractional bandwidth (FBW) of 16.0%, a minimum insertion loss (IL
min
) of 0.70 dB and an out-of-band rejection of 17.8 dB. This is the first report of a SAW filter covering n79 full band, which can provide a valuable reference for advancing SAW application in 5G new radio (NR).
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关键词
LiNbO3,multilayer structure,n79 band,spurious mode suppression,surface acoustic wave filters
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