The Journal of China Universities of Posts and Telecommunications ›› 2024, Vol. 31 ›› Issue (2): 55-61.doi: 10.19682/j.cnki.1005-8885.2024.0004

Special Issue: 集成电路

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Design of high frequency broadband low insertion loss SAW filter at 3.5 GHz


  • Received:2023-11-29 Revised:2024-02-26 Online:2024-04-30 Published:2024-04-30
  • Contact: ZHANG Ying


With the wide application of the fifth-generation mobile communication system (5G) technology, wireless communication equipment tends to develop in miniaturization, high frequency , and low loss. In this paper, a surface acoustic wave (SAW) filter with a center frequency of 3.5 GHz was designed. Firstly, the acoustic waveguide structure of the longitudinal leaky SAW (LLSAW) excitation is determined, and the two-dimensional (2D) theoretical model of the device is established by COMSOL Multiphysics. Secondly, the influence of electrode parameters on the performance of the device is studied, and the electrode parameters are optimized on this basis. By setting the device structure parameters reasonably, the spurious in the passband can be effectively suppressed. Finally, the center frequency of the mirror T-structure LLSAW filter is 3.536 GHz, the insertion loss is -1.414 dB, the bandwidth of -3 dB is 276 MHz, and the out-of-band rejection is greater than -30 dB.

Key words: surface acoustic wave (SAW), electrode, spurious response, mirror T-structure

CLC Number: