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Spoof surface plasmon-based bandpass filter with extremely wide upper stopband

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【Author】 Xiaoyong Liu;Lei Zhu;Yijun Feng;Department of Electronic Engineering, School of Electronic Science and Engineering, Nanjing University;Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau;

【机构】 Department of Electronic Engineering School of Electronic Science and Engineering Nanjing University； Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau；

【摘要】 We investigate the guiding modes of spoof surface plasmon polaritons(SPPs) on a symmetric ultra-thin plasmonic structure. From the analysis, we deduce the operating frequency region of the single-mode propagation. Based on this property, a spoof SPPs lowpass filter is then constituted in the microwave frequency. By introducing a transmission zero at the lower frequency band using a pair of stepped-impedance stubs, a wide passband filter is further realized. The proposed filter is fed by a transducer composed of a microstrip line with a flaring ground. The simulated results show that the presented filter has an extremely wide upper stopband in addition to excellent passband filtering characteristics such as low loss, wide band, and high square ratio. A prototype passband filter is also fabricated to validate the predicted performances.The proposed spoof-SPPs filter is believed to be very promising for other surface waveguide components in microwave and terahertz bands.更多还原

【Abstract】 We investigate the guiding modes of spoof surface plasmon polaritons(SPPs) on a symmetric ultra-thin plasmonic structure. From the analysis, we deduce the operating frequency region of the single-mode propagation. Based on this property, a spoof SPPs lowpass filter is then constituted in the microwave frequency. By introducing a transmission zero at the lower frequency band using a pair of stepped-impedance stubs, a wide passband filter is further realized. The proposed filter is fed by a transducer composed of a microstrip line with a flaring ground. The simulated results show that the presented filter has an extremely wide upper stopband in addition to excellent passband filtering characteristics such as low loss, wide band, and high square ratio. A prototype passband filter is also fabricated to validate the predicted performances.The proposed spoof-SPPs filter is believed to be very promising for other surface waveguide components in microwave and terahertz bands.更多还原

【关键词】 spoof surface plasmon polaritons； bandpass filter； stop band； dispersion relation；
【Key words】 spoof surface plasmon polaritons； bandpass filter； stop band； dispersion relation；

【基金】 Project supported by the Key Grant Project of Ministry of Education of China(Grant No.313029);the FDCT Research Grant from Macao Science and Technology Development Fund,China(Grant No.051/2014/A1);the Multi-Year Research Grant from University of Macau,Macau SAR,China(Grant No.MYRG2014-00079-FST)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2016年03期

【分类号】TN713.5
【被引频次】14
【下载频次】83

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