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文章简述了滤波器的基本原理,涉及到变形低通滤波器的原型和频率变换,提出了一种孔耦合波导谐振器滤波器的结构,设计了中心频率为9.86GHz的窄带滤波器,中心频率处的插入损耗小于0.5dB,阻带的衰减特性曲线相当陡峭。通过实验验证了该设计方法的可行性和正确性。
The basic principle of the filter is introduced. The prototype and the frequency transform of the low-pass filter are introduced. The structure of a hole-coupled waveguide resonator filter is proposed. A narrow-band filter with a center frequency of 9.86GHz is designed. The center The insertion loss at frequencies is less than 0.5 dB and the attenuation characteristic of the stop band is quite steep. The feasibility and correctness of the design method are verified by experiments.