In this paper, an ultra-wideband spoof surface plasmon polaritons’ (SSPPs) power divider with simplest odds ratio (1:3) composed of hexagonal ring unit cells is proposed. The creation of electromagnetic waves with high confinement in a collision between periodically decorated metal and dielectric is a fundamental property of SSPPs. Flexibility, low loss, decreasing cross coupling, and ability for integration are other advantages of SSPP transmission lines. In order to realize the proposed 3-way power divider, first, a novel low loss and compact subwavelength hexagonal unit cell is presented. Next, a plasmonic waveguide is designed. To decrease the dielectric losses, the effect of different substrates on transmission coefficient is investigated too. In the best condition, we have a transmission line with an excellent operation in the frequency range of 3 to 11.8 GHz with a fractional bandwidth (FBW) of 119%. Then, an equal and in-phase 3-way power divider with good isolation between three output ports is designed in a wide frequency range of 2.5–8 GHz with an FBW of 105%. Finally, the proposed 3-way power divider is fabricated and tested in the laboratory. A good agreement between simulations and measurement results proves the functionality of design properly. The ultra wide-bandwidth, low loss, flexibility, and stable performance of this power divider prove its high capability compared with the state-of-the-art references. The proposed power divider can be utilized in developing an integrated plasmonic feeding network of antenna arrays in microwave and millimeter wave frequency bands.

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 (WR), radius (RR) of CCRRs, and their distance to the SSPP line (yR) 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.

No abstract

No abstract

No abstract