This paper presents a wideband bandpass filter design based on a short‐circuited circular patch resonator with inductively loaded slots. The cavity model method is used to analyze the excited resonances of the resonator. According to the illustration of the cavity model, the TM₀₁₀ mode is excited as the fundamental mode, the resonant frequency of which is much lower than that of the TM₁₁₀ mode and can be further lowered by the loaded arc‐oriented slots. Therefore, the proposed resonator can be used to design a filter with compact size. In addition, one of the two orthogonal degenerate TM₁₁₀ modes can be independently tuned by the slot along the symmetric plane without affecting the TM₀₁₀ mode. Since the resonant frequency of each mode can be tuned independently by the parameters of the slots, and the coupling between resonant modes of the resonator and source/load can be adjusted by the feeding angle and the capacitive loaded stubs on the feeding lines, the center frequencies and bandwidths of the designed bandpass filters can be tuned easily. The analysis is theoretically and experimentally verified by two examples with good agreement between the simulated and measured results.

中文翻译：

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利用带槽的短路圆形贴片谐振器设计宽带带通滤波器

本文提出了一种基于带感应负载槽的短路圆形贴片谐振器的宽带带通滤波器设计。腔模型方法用于分析谐振器的激发谐振。根据腔模型的说明，TM ₀₁₀模式作为基本模式被激发，其谐振频率远低于TM ₁₁₀模式的谐振频率，并且可以通过加载的弧形槽进一步降低谐振频率。因此，提出的谐振器可以用于设计具有紧凑尺寸的滤波器。另外，两个正交简并TM ₁₁₀模式之一可以通过槽沿着对称平面独立地进行调谐，而不会影响TM ₀₁₀模式。由于每个模式的谐振频率可以通过槽的参数独立地进行调整，并且谐振器的谐振模式与源/负载之间的耦合可以通过馈电角度，馈电线上的电容负载短线，中心来调节设计的带通滤波器的频率和带宽可以轻松调整。通过两个实例在理论上和实验上对分析进行了验证，仿真和测量结果之间具有很好的一致性。