共面波导馈电的小型化双通带滤波器

发布时间：2019-03-07 23:45

【摘要】：提出了一种采用共面波导馈电的小型多模双通带平面滤波器,该滤波器采用内部嵌套的多模谐振器缩小了电路尺寸,利用奇偶模分析方法和弱耦合激励的方式分析了该多模谐振器的谐振特性,并依此推导出其谐振频率与物理尺寸的相互关系。为了满足滤波器的馈电,端口耦合并实现小型化,引入了异面共面波导馈电结构。文中给出了四个谐振模式的分析以及两个通带中心频率和带宽的控制机理,实现了滤波电路的频率和带宽的独立控制。最终实现了中心频率为2.39GHz和4.34GHz,相对带宽分别为8.8%和13.4%的双通带平面滤波器。该滤波器中心频率和带宽独立设计可控,而且谐振器尺寸大小仅为0.09λg×0.09λg。本文所设计的滤波器结构简单、尺寸小,通带间隔离度较高、易加工制作,具有较高实用价值。
[Abstract]:A small multimode dual-pass planar filter fed by coplanar waveguide is presented in this paper. The filter reduces the size of the circuit by using embedded multimode resonators. The resonance characteristics of the multi-mode resonator are analyzed by means of odd-even mode analysis and weak coupling excitation, and the relationship between the resonant frequency and the physical size is deduced. In order to satisfy the feed of filter, port coupling and miniaturization, the feed structure of heterogeneous coplanar waveguide is introduced. In this paper, the analysis of four resonant modes and the control mechanism of the central frequency and bandwidth of two pass bands are given, and the independent control of the frequency and bandwidth of the filter circuit is realized. Finally, a dual-band planar filter with the center frequency of 2.39GHz and 4.34GHz, and the relative bandwidth of 8.8% and 13.4%, respectively, is realized. The center frequency and bandwidth of the filter are controlled independently, and the size of the resonator is only 0.09 位 g 脳 0.09 位路g. The filter designed in this paper has the advantages of simple structure, small size, high pass-band isolation, easy fabrication and high practical value.
【作者单位】：华中科技大学光学与电子信息学院;
【基金】：国家自然科学基金(61001012)
【分类号】：TN713

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