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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。
A small multimode double passband planar filter with coplanar waveguide feedthrough is proposed. The filter adopts an internal nested multi-mode resonator to reduce the size of the circuit, and uses the methods of odd-even mode analysis and weakly coupled excitation to analyze The resonant characteristics of the multimode resonator and deduced therefrom the relationship between the resonant frequency and the physical size. In order to meet the filter feed, port coupling and to achieve miniaturization, the introduction of a heterogeneous coplanar waveguide feed structure. In this paper, the analysis of four resonant modes and the control mechanism of two passband center frequencies and bandwidths are given, and the independent control of the frequency and bandwidth of the filter circuit is realized. Finally, a dual passband planar filter with center frequencies of 2.39GHz and 4.34GHz and relative bandwidths of 8.8% and 13.4%, respectively, was achieved. The filter center frequency and bandwidth independently designed controllable, and the size of the resonator size is only 0.09λg × 0.09λg. The filter designed in this paper has the advantages of simple structure, small size, high isolation between passbands, easy processing and fabrication and high practical value.