Transmission–absorption integrated structure via dispersion engineering of spoof surface plasmon polariton and frequency-selective surface

Abstract

As the traditional frequency-selective surface (FSS) cannot meet the current needs of stealth, in the eletromagnetic environment today the design of multifunctional FSSs is particularly important. Considering this, in this paper we design a kind of transmission and absorption integrated structure based on the dispersion engineering of the spoof surface plasmon polariton (SSPP) and high-order FSS. It can achieve high-efficiency transmission in the band of 9.8–11.4 GHz and absorption in the band of 14.0–18.0 GHz for both x- and y -polarized waves. The effective angle range is 0° to 60°. Compared with classical planar design, it possesses excellent mechanical properties. The transmission and absorption integrated structure is also fabricated and measured to prove the feasibility of the idea. Due to its thin thickness and character, it can be used in radar cross-section reduction aspects. More importantly, through the shape design of the radome, it can achieve scattering in a lower frequency band.

Direction‐Dependent Janus Metasurface Supported by Waveguide Structure with Spoof Surface Plasmon Polariton Modes

“…To explain the mechanism in this work, the WGS in the bottom layer is studied first. Through the literature, [13,[25][26][27] it can be noticed that the WGS attached by thin metal strips can excite SSPP modes, with excellent EM properties. The dispersion equation of a single metal strip is [25] k k…”

“…To explain the mechanism in this work, the WGS in the bottom layer is studied first. Through the literature, [ 13,25–27 ] it can be noticed that the WGS attached by thin metal strips can excite SSPP modes, with excellent EM properties. The dispersion equation of a single metal strip is [ 25 ] $$\[ \begin{array}{*{20}{c}}{{k_z} = k\sqrt {1 + \frac{{w_2^2}}{{{n^2}}}{{\tan }^2}(kl{\rm{/}}2)} }\end{array} \]$$where k z is the propagation constant of the EM waves on the surface of the plasmonic structure.…”

“…To echo this point and affirm the incident EM waves are traveling in SSPPs mode on the metal strip structure, the dispersion relationship of intrinsic mode at the metal–medium interface in the WGS is calculated. [ 26 ] Consequently, the light line and dispersion curves of the waves on the metal strip arrays with various lengths l from 60 to 140 µm are presented in Figure . The rest parameters are consistent with the above‐mentioned WGS.…”

“…[ 21–24 ] Moreover, it bears mention that promising features of SSPPs in absorption applications have been exploited in several previous research outputs. [ 13,25–27 ] For instance, in 2018, Yang et al. developed a non‐planar plasmonic structure with a straight wire array as a cover on the absorber to achieve broadband absorption at high frequency and enhance the k‐ vector matching absorption by dispersion engineering of SSPPs.…”

“…[21][22][23][24] Moreover, it bears mention that promising features of SSPPs in absorption applications have been exploited in several previous research outputs. [13,[25][26][27] For instance, in 2018, Yang et al developed a non-planar plasmonic structure with a straight wire array as a cover on the absorber to achieve broadband absorption at high frequency and enhance the k-vector matching absorption by dispersion engineering of SSPPs. [28] In 2021, via the dispersion engineering of SSPPs, Zhu et al designed an active absorptive frequency selective surface supported by a transmission-absorption integrated structure.…”