Design and measurement of a thin and light absorbing material for space applications

Abstract

This paper presents the design, realization and measurement of a thin lightweight absorbing material for space applications. Absorber design is based on high impedance surfaces loaded with resistors and known as a resistive high impedance surface (RHIS). The behavior of RHIS is analyzed at normal and oblique incidences for TE and TM polarizations. Prototypes have been realized and measured. Final design has a reflection coefficient less than −15 dB in S-Band (2-2.3 GHz) at normal incidence and till an angular dispersion of 40 • for waves in TE polarization, and 35 • for waves in TM polarization. Simulation results are validated by measurement.

Resistive high-impedance surfaces (RHIS) as absorbers for oblique incidence electromagnetic waves

“…In [15], we proposed a lightweight solution to fabricate wideband RHIS for normal incidence. It consists of an array of square patches etched on Rogers Ò RO4003 substrate (e r = 3.38 ± 0.05) on the top of a honeycomb layer (e r = 1.08 ± 0.05) with the ground plane (copper film) at the bottom.…”

“…In order to validate the concept, simulation results have been compared to measurements. The anisotropic RHIS prototype is realized using the same materials and method as those of the isotropic RHIS prototype described in [15]. The substrate slab with the patches and resistors is pasted on the top of honeycomb using an adhesive film.…”

Design and reflectivity analysis of high temperature wave-absorbing coatings with circular periodic structure

“…Another efficient method to expand the absorption bandwidth of the RAM is to employ frequency selective surfaces (FSS) [6,7]. Compared with traditional RAM coatings, FSS with RAMs have been demonstrated to be lighter, thinner and broadband [8,9], which have been reported in literatures [10][11][12]. However, the investigations above were concerned only with lossless material.…”

CaCu3Ti4O12 particles and MWCNT-filled microwave absorber with improved microwave absorption by FSS incorporation

“…Commonly, the magnetic fillers compound with relatively high density metal, like spinel ferrites, hexagonal ferrites and metallic magnetic materials, etc., need high mixing ratios to obtain high absorption, which result in these absorbers processing high aerial weight [5][6][7][8]. Compared with magnetic fillers, carbon nanomaterials, such as carbon black, multi-walled carbon nanotubes (MWCNTs), carbon nanofibers, and graphite nanoplatelets, were used as dielectric absorbers with relatively low density and mixing ratios.…”

“…Because the effectiveness of the absorbing materials mainly depends on the electromagnetic (EM) properties (such as the complex permittivity and permeability), the key points to design a high absorption microwave absorber involve adjusting and optimizing the EM properties of the absorbers, which can be achieved by controlling the dielectric and magnetic properties, content and thickness of the absorber. Therefore, the combination of suitable dielectric and/or magnetic loss absorbers is useful to optimize their EM properties, which provide an effective solution to improve the microwave absorption of such dielectric particles absorber [5][6][7][8][9].…”