中国邮电高校学报(英文) ›› 2024, Vol. 31 ›› Issue (2): 55-61.doi: 10.19682/j.cnki.1005-8885.2024.0004

所属专题: 集成电路

• Terahertz and Microwave Microsystem • 上一篇    下一篇

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

王巍1,张迎1,王方1,吴浩1,丁辉2,夏旭1,王冠宇1,谢应涛1   

  1. 1. 重庆邮电大学
    2.
  • 收稿日期:2023-11-29 修回日期:2024-02-26 出版日期:2024-04-30 发布日期:2024-04-30
  • 通讯作者: 张迎 E-mail:zhangying00261999@163.com

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 E-mail:zhangying00261999@163.com

摘要:

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.

关键词: surface acoustic wave (SAW), electrode, spurious response, mirror T-structure

Abstract:

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

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