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

doi:10.1088/1674-1056/25/3/034101

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.

Keywords: spoof surface plasmon polaritons bandpass filter stop band dispersion relation

Received: 05 August 2015
Revised: 29 September 2015
Accepted manuscript online:

PACS:	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	84.40.Az	(Waveguides, transmission lines, striplines)
	84.40.Dc	(Microwave circuits)

Fund: 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), and the Multi-Year Research Grant from University of Macau, Macau SAR, China (Grant No. MYRG2014-00079-FST).

Corresponding Authors: Lei Zhu, Yijun Feng
E-mail: LeiZhu@umac.mo;yjfeng@nju.edu.cn

Cite this article:

Xiaoyong Liu(刘小勇), Lei Zhu(祝雷), Yijun Feng(冯一军) Spoof surface plasmon-based bandpass filter with extremely wide upper stopband 2016 Chin. Phys. B 25 034101

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

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