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基于电磁带隙结构(Electromagnetic Band-gap,EBG),本文设计实现了一种W波段宽带低损耗带通滤波器。通过EBG结构的频率带阻特性实现低通滤波,同时利用矩形波导固有的高通特性实现滤波器的低端频率截止。采用减宽波导加载微带EBG结构的方式将高通与低通结构相结合,经过适当的阻抗匹配设计,实现了覆盖75~110GHz全W波段的宽带滤波特性。EBG结构通过在5mil厚Rogers5880基片上制作一系列E面周期加载的谐振单元构成。实物测量结果表明,在75GHz~100GHz内,回波损耗典型值为-20d B,在100GHz~110GHz范围内,回波损耗典型值为-15d B,全带宽内插入损耗典型值小于1d B。该滤波器可用于各种W波段电子系统及测量设备中。
Based on the electromagnetic band-gap (EBG), a W-band broadband low-loss band-pass filter is designed and implemented. The low-pass filter is realized by the frequency band-stop characteristic of the EBG structure, and the low-end frequency cutoff of the filter is realized by utilizing the inherent high-pass characteristic of the rectangular waveguide. By adopting the method of reducing the waveguide loading of the microstrip EBG structure, the high-pass and low-pass structure are combined, and the broadband filtering characteristic covering the entire W band of 75 to 110 GHz is achieved through an appropriate impedance matching design. The EBG structure is made by fabricating a series of E-plane periodically loaded resonating elements on a 5 mil thick Rogers 5880 substrate. The physical measurement results show that the typical return loss is -20d B in the range of 75GHz to 100GHz, and the typical return loss is -15d B in the range of 100GHz to 110GHz. The typical insertion loss in the full bandwidth is less than 1dB. The filter can be used in a variety of W-band electronic systems and measurement equipment.