Wi-Fi频段体声波滤波器的设计

发布时间：2018-03-30 21:22

本文选题：Wi-Fi频段　切入点：滤波器　出处：《强激光与粒子束》2017年10期

【摘要】：为了保证移动设备在Wi-Fi频段正常工作且不受相邻频段的干扰,设计了一种用于Wi-Fi IEEE802.11b频段(2402~2482MHz)的BAW滤波器。设计基于薄膜体声波谐振器(FBAR)的一维Mason等效电路模型构成初始结构的梯形滤波器。然后,将串联FBAR的谐振区面积值以及串、并联FBAR的谐振区面积的比值设置为优化参数,以所需的滤波器的带内插损和带外抑制为优化目标,使用ADS软件基于遗传和梯度的优化算法对滤波器进行优化。在滤波器的设计过程中,为了使仿真结果更加精确,采用声电磁协同仿真方法对滤波器进行仿真,并与Mason等效电路模型仿真结果对比,结果表明,滤波器性能有所下降,带内插损增大1.6dB,带内纹波增大1.1dB,带外抑制基本一致。所设计的Wi-Fi频段的BAW滤波器具有低插入损耗(小于3dB)、高带外抑制(大于40dB)性能。
[Abstract]:In order to ensure that the mobile device works normally in the Wi-Fi band and is not interfered with by the adjacent frequency band, A kind of BAW filter is designed for Wi-Fi IEEE802.11b band 2402n 2482MHz). A one-dimensional Mason equivalent circuit model based on thin film bulk acoustic resonator is designed to form the trapezoidal filter with initial structure. The ratio of resonance area of parallel FBAR is set as the optimization parameter, and the optimal target is the band insertion loss and out-of-band suppression of the required filter. ADS software is used to optimize the filter based on genetic and gradient optimization algorithm. In order to make the simulation results more accurate, the acousto-electromagnetic co-simulation method is used to simulate the filter. Compared with the simulation results of Mason equivalent circuit model, the results show that the filter performance has been reduced. The band insertion loss increases 1.6 dB, the band ripple increases 1.1 dB, and the out-of-band suppression is basically consistent. The designed BAW filter in the Wi-Fi band has low insertion loss (less than 3 dB) and high out-of-band suppression (> 40 dB).
【作者单位】：西南科技大学信息工程学院;中国工程物理研究院电子工程研究所;中国科学院高能物理研究所核探测与核电子学国家重点实验室;
【基金】：国家自然科学基金项目(61574131) 中国工程物理研究院超精密加工技术重点实验室基金项目(2014ZA001) 核探测与核电子学国家重点实验室开放课题基金项目(2016KF-02) 西南科技大学特殊环境机器人技术四川省重点实验室开放基金项目(14ZXTK01);西南科技大学研究生创新基金项目(16ycx101)
【分类号】：TN713

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