ABSTRACT This paper proposes the design of a novel double folded substrate integrated waveguide (FSIW) band pass filter (BPF) based on Koch space-filling curve (SFC). The folded SIW filter is incorporated with first and second iteration levels of Koch curve on central conducting layer. A prototype of second iteration Koch fractal FSIW BPF has been fabricated using substrate having dielectric constant 2.55 and thickness 0.508 mm for each layer and then tested. The fabricated second order filter has merits of compact size (0.204 λ02), high roll off rate (82.2 dB/GHz) and low insertion loss (<0.85 dB) in the X band.

中文翻译：

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具有科赫分形的小型化高选择性折叠衬底集成波导带通滤波器的设计

摘要 本文提出了一种基于科赫空间填充曲线 (SFC) 的新型双折叠衬底集成波导 (FSIW) 带通滤波器 (BPF) 的设计。折叠的 SIW 滤波器与中央导电层上的第一和第二迭代级别的 Koch 曲线相结合。已经使用介电常数为 2.55 且每层厚度为 0.508 mm 的衬底制造了第二次迭代 Koch 分形 FSIW BPF 的原型，然后进行了测试。制作的二阶滤波器具有尺寸紧凑（0.204 λ02）、高滚降率（82.2 dB/GHz）和X波段插入损耗低（<0.85 dB）等优点。