Abstract
We use indium tin oxide (ITO), one of the representative resistive materials, for the implementation of a metamaterial electromagnetic (EM) absorber with a high absorbance in a wide frequency range. Highly symmetrical split ring resonators made of ITO film are deposited on the polyethylene terephthalate with transparent and flexible features, and such a configuration causes the proposed absorber to be insensitive to polarization and incidence angles. The proposed absorber, with a profile of only 0.171λ, exhibits a wideband absorbance of 7.2 GHz to 27 GHz, with a 90% absorption criterion. A prototype is built, and all the computed expectations from the full-wave EM simulations in this work are verified experimentally.
Highlights
A study of electromagnetic (EM) shielding absorbers is actively carried out, along with an investigation of the increase in undesirable EM radiation interference from an explosive growth of wireless devices, the high integration of electric equipment in automobiles, and several small radio stations
The EM absorbers can be effectively utilized to reduce the radar cross-section (RCS) in future electronic warfare, where many electronics are intensively engaged in information aggregation, engagement, and operations of surveillance and reconnaissance
We propose extremely thin, wideband, indium tin oxide (ITO)-based MTM–EM absorbers using split ring resonators (SRRs)
Summary
A study of electromagnetic (EM) shielding absorbers is actively carried out, along with an investigation of the increase in undesirable EM radiation interference from an explosive growth of wireless devices, the high integration of electric equipment in automobiles, and several small radio stations. A planar, or thin profile form factor, is desirable compared to the commonly used bulky triangular pyramid shapes, since only a minimum footprint would be allowed for the absorbers due to the miniaturization and high integration development trend of electronics. Such a thin profile is favorable for electrical stealth and for physical concealment in military vehicles [2]. We propose extremely thin, wideband, ITO-based MTM–EM absorbers using split ring resonators (SRRs) This reveals an improved bandwidth ratio over the structure profile when compared to reported works in the literature. The prototype is built, and all full-wave EM simulations are verified experimentally
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