Controllable Filtering Structure Using Magnetic Coupling Between Spoof Plasmonic Waveguide and Solid Dielectric Resonators

Ming Zhe Hu,Wei Min Li,Pei Hang He,Hao Chi Zhang

doi:10.1109/access.2020.2964775

Ming Zhe Hu, Wei Min Li + Show 2 more

Open Access

https://doi.org/10.1109/access.2020.2964775

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Journal: IEEE Access	Publication Date: Jan 1, 2020
Citations: 2	License type: CC BY 4.0

Affiliation: Guizhou Minzu University, Southeast University

Abstract

The structure and electrical characteristics of a dielectric resonator (abbreviated as DR hereafter) loaded plasmonic waveguide with controllable bandwidth are investigated in the present research. By loading the high permittivity dielectric medium on a spoof surface plasmonic waveguide, the working bandwidth of the filtering structure can be regulated flexibly due to the resonant effect of the loaded cylindrical DR. The DR is home-made and possesses the permittivity of 25.66, tanδ of 5.3 × 10 -5 and stable temperature coefficient of -6.3 ppm/°C in microwave region. After the DR is loaded, the filtering structure can form the transmission zero on the edge of the pass band, regulating the bandwidth as well as increasing the out-of-band rejection. By controlling the height between the loaded DR and the substrate, or adjusting the inter-distance between the DRs, the relative bandwidth of the filtering structure can be effectively tailored.

Highlights

The surface plasmon polaritons (SPPs) is a kind of surface electromagnetic wave, which propagates along the interface between metal and dielectric
ENGINEMODE ANALYSIS As well known, one of the great advantages of spoof surface plasmonic structure is that its dispersive properties depend entirely on its structural parameters, engineering the structural dependent dispersion characteristics is very important for the subsequent waveguide design
As can be seen from the dispersion and E-filed distribution characteristics of the proposed artificial plasmonic structure illustrated in Fig.1(d) and (e) respectively, the designed complimentary circle slots possess two basic resonant modes, namely the odd mode and the even mode, or the bonding mode and antibonding mode respectively

Summary

Introduction

The surface plasmon polaritons (SPPs) is a kind of surface electromagnetic wave, which propagates along the interface between metal and dielectric. Its amplitude decays exponentially in the direction vertical to the interface due to the negative permittivity of the metal, on the interface, it possesses the capability of transforming the traditional Sommerfeld or Zenneck surface waves into highly confined electromagnetic waves within a subwavelength region [1]. This feature provides favorable conditions to overcome the diffraction limit, and SPPs have been proposed potential applications for super-resolution imaging [2], [3], electromagnetically induced transparency (EIT) [4], energy harvesting [5] and SPP power divider circuits [6]. It can be employed to fabricate novel microwave compact devices [8]

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