Meta-Dome for Broadband Radar Absorbing Structure

Abstract

This study focused on the radome and proposed an absorber with a meta-dome structure for ultra-wideband radar absorption using an FR-4 dielectric material on the metasurface absorber for protection. In addition to protecting the absorber, the metasurface absorber exhibited ultra-wideband frequency absorptivity from radar signals, with an absorptivity band from 4.6–12 GHz, including the C and X frequency bands of radar signals. A wide incidence angle should also be considered in addition to the absorption frequency band. Experimental results were obtained for all polarization angles at normal incidence for 5–14 GHz. Sensitivity to incident angle from 0° to 40° in the transverse electric mode and 0° to 60° in the transverse magnetic mode were observed. The proposed concept was demonstrated using full-wave simulation and experimental measurements.

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

“…With the rapid development of artificial EM media, metamaterials, composed of 2D or 3D periodic or quasi-periodic sub-wavelength inclusions, have gained extensive attention from both the academic and engineering communities. Metamaterials exhibit unique EM properties that are impossible or very hard to be obtained with natural materials, such as adjusting the scattering parameters and changing equivalent wave impedance [12]- [15]. This provides unprecedented freedom in manipulating reflection /refraction of EM waves [16]- [18].…”

Polarization Insensitive, Wide-Angle, Ultra-wideband, Flexible, Resistively Loaded, Electromagnetic Metamaterial Absorber using Conventional Inkjet-Printing Technology

“…In 28 the proposed geometry consists of chip resistors, soldered onto a copper pattern, which lies in between two substrates (one is grounded). For normal incidence the absorber exhibits a fractional bandwidth (FBW) of 100%, while for oblique incidence it presents FBW from 77.3% to 90.5% up to 60 deg, depending the polarization of the incident plane wave.…”

“…For normal incidence the absorber exhibits a fractional bandwidth (FBW) of 100%, while for oblique incidence it presents FBW from 77.3% to 90.5% up to 60 deg, depending the polarization of the incident plane wave. The absorber in 29 consists of two patterned layers (one is scaled to the other) and chip resistors, as well, but exhibits wider FBW (112%) than 28 for normal incidence: in general, the use of multiple pattern layers leads to wider absorbance, since each of these, resonates at a different frequency, and thus, the final absorbance consists of multiple maxima, which produce a wide bandwidth 38 . A similar technique is used by the authors in 30 : now the scaled pattern and the original one lie on the same layer, resulting FBW = 126.8%.…”

Optically Transparent Metamaterial Absorber Using Inkjet Printing Technology

“…Furthermore, its fabrication is easy and involves low cost. Therefore, metamaterial absorbers have been researched in various electromagnetic fields such as stealth technology [35,36], electromagnetic interference/electromagnetic compatibility [37,38], or radio frequency (RF) sensor applications [39,40].…”