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《15 带混合源和负载耦合的基片集成波导滤波器》.pdf

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ANSYS 2011 中国用户大会优秀论文 带混合源和负载耦合的基片集成波导滤波器 沈 玮 上海交通大学,200240 [ 摘 要 ] 本文提出一种带混合源和负载耦合的基片集成波导线性相位滤波器。通过引入两个开口环结构 到基片集成波导滤波器中实现混合源和负载耦合,从而得到准椭圆特性。基于耦合矩阵理论, 详细地验证了该类滤波器的电响应。基于标准单层印刷电路板(PCB)工艺,设计并加工实现 了一款四阶基片集成波导滤波器。测试与仿真结果吻合的较好,结果显示该类滤波器具有三个 传输零点和平滑带内时延。 [ 关键词 ] 带通滤波器,混合源和负载耦合,基片集成波导,S 参数,传输零点 Substrate Integrated Waveguide (SIW) Linear Filter with Mixed Source and Load Coupling Wei Shen Shanghai Jiao Tong University, Shanghai 200240, China [ Abstract ] A linear phase substrate integrated waveguide (SIW) filter with mixed source and load coupling (MSLC) is presented in this paper. Two open-loop structures are introduced to achieve MSLC for quasi-elliptic function. Electric responses of the filter are studied in detail by coupling matrix theory. A fourth-order filter sample is designed and fabricated on single-layered printed circuit board (PCB) technology. Good agreements are obtained between the measured and simulated S-parameters. Then, three transmission zeros and flat group delay can be obtained. [ Keyword ] bandpass filter, mixed source and load coupling (MSLC), substrate integrated waveguide (SIW), S-parameters, transmission zeros. 1 前言 在无线和移动通信系统中,由于各种非线性元件的存在,致使输出的信号会产生一定 的相位失真,因此,具有线性相位特性的滤波器在通信系统中占据着重要地位[1]。在传统 交叉耦合拓扑结构中,为了实现线性相位特性,需要将交叉耦合与直接耦合设为同种性质 [2]。与此同时,为了保证信号的完整性,希望具有线性相位的滤波器也拥有较为陡峭的边 带。 ANSYS 2011 中国用户大会优秀论文 由于具有高 Q 值、低损耗和低成本等特性,基片集成波导(Substrate Integrated Waveguide, SIW )受到越来越多的关注,同时也比较容易与其他平面电路相集成。各式各 样的 SI
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