Quasi quarter SIW-mode resonator and its application to sierpinski fractal filter design

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• 作者：Sheng Zhang ; Xue-Dong Fu ; Ting Wang ; Fa-Lin Liu ; Hai-Ting Wang and Hai Liu
• 关键词：cross coupling ; quasi quarter substrate integrated waveguide resonator (QQSIWR) ; Sierpinski fractal filter ; transmission zero
• 刊名：Microwave and Optical Technology Letters
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：58
• 期：5
• 页码：1176-1179
• 全文大小：309K
• ISSN：1098-2760

文摘

In this letter, a new kind of quasi quarter SIW resonator (QQSIWR) using Sierpinski fractal defected structure is presented first. Comparing with SIW resonator, this novel resonator has lower resonant frequency (f₀) and acceptable unloaded quality (Q_u) value, while maintaining almost unchanged electromagnetic fields distributions. The frequency characteristics and Q_u of this resonator is investigated under different fractal sizes. To validate the properties of QQSIWR, a miniature cross-coupled bandpass filter (BPF) with a size reduction over 88% is proposed and optimized using Sierpinski fractal structure and cross coupling technology. It can produce asymmetrical frequency response by generating a transmission zero (TZ) on the high side of passband. A prototype of the filter is fabricated and measured, and the measured results are in good agreement well with the simulated ones.