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Book ChapterDOI

A Novel Design of FSS-Based Absorber Integrated Microstrip Antenna

TL;DR: In this paper, a dual-band FSS-based absorber with high angular stability has been proposed to function from 3.4-4.6 GHz to 7.9-9 GHz.
Abstract: In this article, the design of a dual-band FSS-based absorber with high angular stability has been proposed to function from 3.4–4.6 GHz to 7.9–9 GHz. An air gap of 1.6 mm is kept between two identical layers of concentric split ring resonator based FSS. The bottom FSS has a metallic backing to ensure minimum transmission. A square patch-based microstrip antenna has been designed to operate at 6.1 GHz. When this antenna is integrated with the absorber, out of band RCS reduction of the antenna takes place for a wide range of frequencies.
References
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Journal ArticleDOI
TL;DR: In this article, the authors reported the first experimental demonstration of an omnidirectional electromagnetic absorber in the microwave frequency, composed of non-resonant and resonant metamaterial structures, which can trap and absorb electromagnetic waves coming from all directions spirally inwards without any reflections due to the local control of electromagnetic fields.
Abstract: In a recent theoretical work by Narimanov and Kildishev (2009 Appl. Phys. Lett. 95 041106) an optical omnidirectional light absorber based on metamaterials was proposed, in which theoretical analysis and numerical simulations showed that all optical waves hitting the absorber are trapped and absorbed. Here we report the first experimental demonstration of an omnidirectional electromagnetic absorber in the microwave frequency. The proposed device is composed of non-resonant and resonant metamaterial structures, which can trap and absorb electromagnetic waves coming from all directions spirally inwards without any reflections due to the local control of electromagnetic fields. It is shown that the absorption rate can reach 99 per cent in the microwave frequency. The all-directional full absorption property makes the device behave like an 'electromagnetic black body', and the wave trapping and absorbing properties simulate, to some extent, an 'electromagnetic black hole.' We expect that such a device could be used as a thermal emitting source and to harvest electromagnetic waves.

267 citations

Journal ArticleDOI
TL;DR: In this article, a multi-band and polariza- tion insensitive metamaterial absorber is presented, which consists of six close rings which distribute in two metallic layers separated by FR4 flber glass PCB substrates.
Abstract: The design and realization of a multi-band and polariza- tion insensitive metamaterial absorber is presented. The structure with thickness 1.1mm consists of six close rings which distribute in two metallic layers separated by FR4 flber glass PCB substrates. Ex- perimental results show that over 93.3% absorption can be achieved in this metamaterial absorber at multiple frequency bands (more than two). Due to the rotational symmetric pattern of the metamaterial, the performance of the absorber is insensitive to the polarization of the incident waves, indicating the superiority of the structure in the application.

194 citations

Journal ArticleDOI
TL;DR: In this article, a 3D metamaterial stacked array for the conversion of electromagnetic waves energy into AC was proposed. But the authors considered an operating frequency of 5:8GHz and showed that using stacked arrays can signiflcantly improve the efficiency of the harvesting system in comparison to a 2-D array.
Abstract: We present the design of 3-D metamaterial stacked arrays for e-cient conversion of electromagnetic waves energy into AC. The design consists of several vertically stacked arrays where each array is comprised of multiple Split-Ring Resonators. The achieved conversion e-ciency is validated by calculating the power dissipated in a resistive load connected across the gap of each resonator. Numerical simulations show that using stacked arrays can signiflcantly improve the e-ciency of the harvesting system in comparison to a ∞at 2-D array. In fact, the per-unit-area e-ciency of the 3-D design can reach up to 4.8 times the case of the 2-D array. Without loss of generalization, the designs presented in this work considered an operating frequency of 5:8GHz.

50 citations

Proceedings ArticleDOI
25 Oct 2012
TL;DR: In this article, the dual-band absorbance of a single-layer nearly perfect absorber has been realized by employing the two conventional FSS single frequency resonant elements with different geometry shapes in a single periodic cell.
Abstract: A simple means to obtain the performance of dualband terahertz absorber was demonstrated with numerical approaches in this paper. The dual-band absorbance of a single-layer nearly perfect absorber has been realized by employing the two conventional FSS single frequency resonant elements with different geometry shapes in single periodic cell, which can provide two tunable resonant frequencies independently for terahertz application.

5 citations

Proceedings ArticleDOI
07 Jul 2019
TL;DR: In this article, a reconfigurable textile electromagnetic absorber is proposed for wearable applications, which is composed of a modified version of the well-known, artificial magnetic inclusion, the Split-Ring Resonator (SRR).
Abstract: In this paper, a reconfigurable textile electromagnetic absorber is proposed for wearable applications. The textile absorber is composed of a modified version of the well-known, artificial magnetic inclusion, the Split-Ring Resonator (SRR). The designed electromagnetic absorber provides extra freedom in ease of placement of either rectified load or a biasing circuitry for reconfigurability of the absorber or even both. Numerical studies are carried out in order to investigate the absorption strength from the proposed metamaterial absorber. Furthermore, the reconfigurability was achieved using a biasing varactor circuitry. Based on the numerical full-wave simulations, the proposed absorber structure exhibits an absorption of 99% at a frequency of 4.9 GHz under normal incidence when absorber is in ON state, while the peak absorptivity was shifted to higher frequency of 5.06 GHz when absorber is in OFF state with slight reduction in absorption level.

4 citations