Abstract
This paper presents a novel single-layer dual band-rejection-filter based on Spoof Surface Plasmon Polaritons (SSPPs). The filter consists of an SSPP-based transmission line, as well as six coupled circular ring resonators (CCRRs) etched among ground planes of the center corrugated strip. These resonators are excited by electric-field of the SSPP structure. The added ground on both sides of the strip yields tighter electromagnetic fields and improves the filter performance at lower frequencies. By removing flaring ground in comparison to prevalent SSPP-based constructions, the total size of the filter is significantly decreased, and mode conversion efficiency at the transition from co-planar waveguide (CPW) to the SSPP line is increased. The proposed filter possesses tunable rejection bandwidth, wide stop bands, and a variety of different parameters to adjust the forbidden bands and the filter’s cut-off frequency. To demonstrate the filter tunability, the effect of different elements like number (n), width (), radius () of CCRRs, and their distance to the SSPP line () are surveyed. Two forbidden bands, located in the X and K bands, are 8.6–11.2 GHz and 20–21.8 GHz. As the proof-of-concept, the proposed filter was fabricated, and a good agreement between the simulation and experiment results was achieved.
Highlights
Surface plasmon polaritons (SPPs) have the ability to miniaturize the photonic components and overcome the classical diffraction limit with scales smaller than the light-line
SPPs do not exist naturally in the microwave and THz frequency regime, so plasmonic metamaterials (PMMs) containing periodic sub-wavelength cells were proposed in the name of Spoof SPPs (SSPPs)
The SSPP modes are a kind of special surface electromagnetic waves that are highly localized to the dielectric-metal interface and exponentially decay away from the interface
Summary
Surface plasmon polaritons (SPPs) have the ability to miniaturize the photonic components and overcome the classical diffraction limit with scales smaller than the light-line. SSPPs have several advantages, such as supporting bend structures and flexible substrate, being naturally broadband, low fabrication cost, low cross-coupling, and lower ohmic & dielectric loss, in comparison to conventional technologies They have controllable properties by adjusting geometrical parameters [3,4,5]. The filter’s high cut-off frequency and the forbidden bands can be independently controlled by tuning the SSPP unit-cell and the geometrical parameters in the filter part, respectively. Using such a structure with ground planes on double sides of the corrugated strip engenders tighter EM fields and improves the performance of the filter at lower frequencies. Experiments are conducted to confirm the excellent filtering performance of the structure
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