Piezoelectrics & Acoustooptics, Volume. 42, Issue 2, 155(2020)
The Optimal Design of Ultra Wideband Low Loss SAW Filter
This paper describes the development of ultra wideband and very low loss SAW filter based on the large electromechanical coupling coefficient Love wave mode, a Cu electrode/15°YX LiNbO3 structure was employed as a substrate. The design adopts the modified coupled mode model for accurate simulation and simulated annealing algorithm for the optimization of resonator parameters. The width/length weighted dummy electrodes were used to suppress spurious responses caused by the transverse mode resonances, and a viscous film was coated on the filter surface which is effective in suppress a spurious dip caused by Rayleigh mode. A filter with the center frequency of 620 MHz, -1 dB fractional bandwidth of 14.9%, -3 dB bandwidth of 18.3%, insertion loss of 0.94 dB, and out of band rejection of higher than 40 dB was fabricated.
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HUANG Xin, YAN Kunkun, HUANG Wei, WEI Yongping. The Optimal Design of Ultra Wideband Low Loss SAW Filter[J]. Piezoelectrics & Acoustooptics, 2020, 42(2): 155
Received: Sep. 29, 2019
Accepted: --
Published Online: Apr. 21, 2022
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