A Novel Broadband Band-pass Filter Based on Spoof Surface Plasmon Polaritons

Abstract

In this paper, we present a novel broadband bandpass filter based on spoof surface plasmon polaritons (SSPPs) in the microwave frequency band. The proposed bandpass filter includes three parts: (1) coplanar waveguide (CPW); (2) matching transition; and (3) coupled structure that is an asymmetric coupled filter constructed by five grooved strips. The proposed bandpass filter realizes excellent low loss performance from 7 to 10 GHz, in which its insertion loss is around 1.5 dB in the same frequency band. Meanwhile, this filter has a good band stop characteristic from 3 to 7 GHz. A simple but accurate transmission line model was proposed to evaluate the proposed broadband SSPPs filter. The measured data, simulated results and the results obtained from the transmission line model have shown a very good agreement. The proposed planar broadband filter plays an important role for filtering surface plasmon polaritons (SPPs) waves in plasmonic circuits and systems.

Low-Profile Spoof Surface Plasmon Polaritons Traveling-Wave Antenna for Near-Endfire Radiation

“…Owing to the groundless structure and strong field confinement in a subwavelength scale, SSPPs are good candidates for high-density integrated circuits and components at millimeterwave and Terahertz frequencies [6]. Extensive explorations and researches have been conducted in this area, including transition structures using coplanar waveguide (CPW) or microstrip line [7]- [10], filters [11]- [13], amplifiers [14], power splitters [15], and antennas [16]- [23].…”

An SIW antenna utilizing odd‐mode spoof surface plasmon polaritons for broadside radiation

“…Since these surface waves mimic the properties of SPPs, such as subwavelength localization, near‐field enhancement, and novel dispersion characteristics, they are termed as designed SPPs (DSPPs) or spoof SPPs (SSPPs). Due to these unique advantages, various functional devices based on SSPPs are designed, like filters, power divider, circulator, and antennas …”

Odd-mode and even-mode spoof surface plasmon polaritons supported by complementary plasmonic metamaterial with underlayer ground

“…The conversion efficiency between microstrip line and SSPPs structures with underlayer ground is higher than [15,16]. Meanwhile, plenty of microwave devices based on SSPPs structures have been proposed, which lay the foundation for the establishment of SSPP system in the future [19,20,21,22,23,24,25,26,27,28,29,30].…”