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Ka波段微带滤波器的仿真与测试

2015-03-31邓庆文范童修卢胜军

现代电子技术 2015年5期

邓庆文 范童修 卢胜军

摘 要: 微带滤波器在电子工程领域有很重要的应用,设计了一款Ka波段微带滤波器并通过测试夹具研究键合线及键合微带线间隙对其性能的影响。结合电磁仿真结果与实测结果发现: 键合金丝及键合微带线间隙在高频条件下引入的寄生参数恶化滤波器的驻波,通过提取相应的等效参数,并对键合端点进行阻抗匹配,再次进行电磁场仿真,结果表明滤波器的驻波有了明显的改善。

关键词: 微带滤波器; 键合线; ADS; HFSS; 寄生参数

中图分类号: TN713?34 文献标识码: A 文章编号: 1004?373X(2015)05?0149?03

Simulation and testing of Ka?band microstrip filter

DENG Qing?wen, FAN Tong?xiu, LU Sheng?jun

(No.36 Research Institute of CETC, Jiaxing 314033, China)

Abstract: Microstrip filters are widely used in the electronic engineering field. A Ka?band microstrip filter was designed and tested for the target to investigate return loss and insertion loss from bonding wire and gap between bonding microstrip wires. The results show that the gap between gold bonding wire and microstrip wire may deteriorate the standing wave of the filter if pa?rasitic parameter is introduced under the condition of high frequency. After the equivalent parameters was extracted and impe?dance was matched at the bonding endpoint, another electromagnetic field simulation was carried out. The result indicates that the standing wave of the filter is improved obviously.

Keywords: microstrip filter; bonding wire; ADS; HFSS; parasitic parameter

0 引 言

滤波器作为信号处理链路中的关键器件,不仅可以实现信号分离、抑制干扰,还可以起阻抗变换、阻抗匹配和延迟信号的作用。滤波器的性能直接影响系统的性能,因此,设计并制备出性能优越的滤波器对保证射频、微波信号处理系统的性能具有十分重要意义。与集总参数元件滤波器相比,微带线滤波器具有重量轻、体积小、易于加工集成、易于与射频电路匹配等优点,目前广泛应用于射频、微波等频率较高的通信电路中[1?4]。滤波器的工作频率是决定滤波器尺寸的关键因素,对体积小、工作频率高的微带线滤波器在实际应用时需要将滤波器输入、输出微带线与上一级元器件的输出端和下一级的输入端相连,一般通过键合线或者微带线转SMA接头来连接。由于金丝键合处的不连续性和键合端口微带线之间的间隙在高频下的寄生参数导致滤波器的测试性能与实际性能有所不同,只有将金丝键合模型参数提取出来并在测试过程中进行校正,才能使实测结果逼近真实结果。……

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