Piezoelectrics & Acoustooptics, Volume. 42, Issue 2, 155(2020)

The Optimal Design of Ultra Wideband Low Loss SAW Filter

HUANG Xin... YAN Kunkun, HUANG Wei and WEI Yongping |Show fewer author(s)
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    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

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    Paper Information

    Received: Sep. 29, 2019

    Accepted: --

    Published Online: Apr. 21, 2022

    The Author Email:

    DOI:10-11977/j.issn.1004-2474.2020-02-002

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