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

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.INDEX TERMS Dielectric resonators, filtering structure, permittivity, spoof surface plasmon polaritons.

Independently controllable dual band filtering characteristics of a spoof surface plasmonic waveguide employing compound slot structure

“…Also, people focus on the development of controllable plasmonic filters by using SSPPs and coplanar waveguide (CPW) based coupling structure, adjustable dielectric resonators, tunable metamaterial particles as well as tunneling propagations channels [24][25][26][27][28][29][30][31][32][33]. The multichannel composite SSPPs were excited by CPW.…”

Plasmonic dual-band waveguide with independently controllable band-notched characteristics

“…Bearing this in mind, it is urgent to develop broadband filters with electrically adjustable notch characteristics for suppressing interference and spurious signals in multi-band adaption. Actually, people have proposed dynamically adjustable plasmonic filters by loading active devices in DSPPs structures, such as adjustable dielectric resonators, 29) tunable metamaterial particles [30][31][32][33] and tunneling propagations channels. 34) Reconfigurable dual passband filters can be tuned in a series of ways to change their center frequency, bandwidth and other properties to cope with the operating modes of different applications in communication systems.…”