Wide-Angle Transmission Enhancement of Metamaterial-Doped Fiber-Reinforced Polymers

Abstract

In this paper, we propose to enhance the transmission of EM waves through fiber-reinforced polymers (FRPs) by modifying the local field distributions using the metamaterial inclusions. Due to the higher permittivity of FRPs relative to the air, the transmission of the s-polarized waves decreases drastically with the incidence angle θ i. By doping metallic strips into an FRP plate, the magnetic vectors in the plate are tilted vertically under large incidence angles, and hence, the refracted angle in the plate is increased. This is equivalent to reduce the effective permittivity of the FRP, which enables significant transmission enhancement, especially under large incidence angles. A Ku-band prototype was designed, fabricated, and measured. Both simulated and measured results verify that the metamaterial doping can achieve transmission enhancement in an ultra-wide incidence angle range θ i ∈ [0, 80 • ]. This paper provides an effective route to the design of transparent radomes for base stations, aircraft, and so on. INDEX TERMS Wide-angle transmission, electromagnetic transparency, metamaterial doping.

Ultrawide‐Angle Ultralow‐Reflection Phenomenon for Transverse Electric Mode in Anisotropic Metasurface

“…Ultrawide‐angle or even angle‐independent transparent surfaces are more urgently desired in the design of high‐performance radomes and wireless communication systems. [ 41,42 ] It is gratifying to find that a method can theoretically uncover a new route and realize the required transparent and ultrawide‐angle surfaces by attenuating the impedance mismatch between air and the refracting material. The attenuation can be achieved by regulating the product of tangential and normal relative permeability (μ t μ n ), which is named as an angular factor, because the part of the characteristic impedance increases significantly with an increase in the incidence angle.…”

Anti-reflection metasurface synergizing plasma and lattice modes: an efficient route to wideband electromagnetic transparency under extreme angles

“…Due to the diluted effective permittivity above the plasma frequency, the impedance matching is improved and the transmission around f 1 is enhanced [28,29]. And since the plasma frequency is independent of the angle as shown in equation ( 8), the transmission enhancement characteristic exists at almost all angles (w p represents the plasma frequency, c 0 represents the speed of light in vacuum, a represents the space between long metallic wires-, and r the radius of long metallic wires [26,27]).…”

“…For instance, Yongzhi Li proposes to enhance TE-polarization transmittance ability by introducing plasma mode in a metasurface. Unfortunately, the effective bandwidth under extreme angles is narrow due to the single-mechanism design [26,27]. Besides, in our previous work, we propose to enhance the TE-polarization transmission of dielectric plates under extreme angles by loading with meta-atoms working in the whole Ku band.…”

In-band Radar Cross Section reduction for electromagnetic window by simultaneously enhancing transmission and coding reflection

“…In recent years, many anti-reflective metasurfaces have been proposed to enhance transmission, some of which have been put into practical application [1][2][3][4][5][6][7][8][9][10]. However, the function of the ordinary antireflective metasurface is limited to enhancing transmission.…”

“…Reflection is inevitable. The traditional radar cross section (RCS) reduction method is unfavorable in practical application to some extent because it increases the cost and the weight of the original device [1][2][3][4][5]. So, can we reduce RCS by further dealing with reflection?…”