scholarly journals Electromagnetic Absorbers based on High-Impedance Surfaces: From ultra-narrowband to ultra-wideband absorption

2012 ◽  
Vol 1 (3) ◽  
pp. 7 ◽  
Author(s):  
F. Costa ◽  
A. Monorchio
Keyword(s):  
Frequency Selective Surface ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Ultra Wideband ◽  
Resonant Structure ◽  
High Impedance ◽  
Perfect Metamaterial Absorber ◽  
Absorption Phenomenon ◽  
Loss Component ◽  
Frequency Selective

Different electrically-thin absorbing designs based on  High-Impedance Surfaces (HIS) are presented and classified on the basis of the nature of loss. HIS structures allow achieving absorption by exploiting either dielectric or ohmic (resistive) losses. The former ultra-narrowband absorption phenomenon can be obtained by employing dielectric losses of commercial substrates. The resonant structure, often referred to as Perfect Metamaterial Absorber, usually comprises a metallic frequency selective surfaces located above a ultra-thin grounded dielectric substrate. The metamaterial absorber is also angularly stable because of its reduced thickness. Alternatively, if a loss component is introduced in the frequency selective surface located in front of the grounded dielectric substrate both narrowband and wideband absorbing structures can be designed.

scholarly journals Stereo Perfect Metamaterial Absorber Based on Standing Gear-Shaped Resonant Structure With Wide-Incident-Angle Stability

2020 ◽  
Vol 8 ◽  
Author(s):  
Guangsheng Deng ◽  
Kun Lv ◽  
Hanxiao Sun ◽  
Zhiping Yin ◽  
Jun Yang
Keyword(s):  
Incident Angle ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Center Frequency ◽  
Resonant Structure ◽  
Potential Applications ◽  
Angle Stability ◽  
Perfect Metamaterial Absorber

In this work, a single-band metamaterial absorber (MA) based on a three dimensional (3D) resonant structure is presented. The unit cell is composed of a standing gear-shaped resonator, which is embedded in the dielectric substrate. The proposed 3D MA is ultrathin with a total thickness of 2.3 mm, corresponding 0.077λ0 at its center frequency. The simulation results demonstrate a high absorption peak at 10.1 GHz with absorptivity of 99.9%. The proposed 3D MA is insensitive to the polarization of the incident wave due to its rotationally symmetric structure. Moreover, the proposed 3D MA exhibits a wide-incident-angle stability, as absorptivity of more than 85% can be achieved for both TE and TM incidences with incident angle up to 60°. Most importantly, multiband electromagnetic wave absorption of the stereo MA can be enabled by adjusting the structural parameters of the standing gear. The proposed structure is compatible with 3D printing technology and has potential applications in electromagnetic shielding.

Ultra-wideband and low-loss linear-to-circular polarizer based on multilayer frequency selective surface

2021 ◽  
Vol 127 (2) ◽  
Author(s):  
Ping Wang ◽  
Yu Wang ◽  
Yanwen Hu ◽  
Hongcheng Zhou ◽  
Zhongming Yan ◽  
...  
Keyword(s):  
Frequency Selective Surface ◽  
Ultra Wideband ◽  
Low Loss ◽  
Circular Polarizer ◽  
Frequency Selective

Design and implementation of 2.5D frequency-selective surface based on substrate-integrated waveguide technology

2019 ◽  
Vol 11 (3) ◽  
pp. 255-267 ◽  
Author(s):  
Krushna Kanth Varikuntla ◽  
Raghavan Singaravelu
Keyword(s):  
Incidence Angle ◽  
Equivalent Circuit Model ◽  
Frequency Selective Surface ◽  
Dielectric Substrate ◽  
Angular Stability ◽  
Substrate Integrated Waveguide ◽  
Patch Type ◽  
Angular Performance ◽  
Final Design ◽  
Frequency Selective

AbstractIn this paper, the patch-type frequency selective surfaces (FSS) based on substrate-integrated waveguide (SIW) technology is proposed to improve the bandwidth (BW) and angular performance. The proposed FSS configuration overcomes the limitations of both conventional 2D and 3D FSS structures. A closely coupled cascaded mechanism is employed to combine two identical FSS elements separated by thin dielectric substrate results in incorporation of SIW technology; hence, named as 2.5D FSS. A derived equivalent circuit model is used to estimate the basic performance of proposed FSS–SIW elements, and the response of analytical expressions has been validated and final design is obtained using full-wave simulations. Two basic FSS elements viz. single square loop and a Jerusalem cross have been investigated to prove the enhancement in their BW and angular stability. The proposed technique evidently improves the BW and angular stability of FSS structures than in its established form. Besides, various important parameters that influence the performance characteristics of reported 2.5D FSSs are also studied. The important observations made on the thickness, as the thickness increases the bandstop FSS, can change to bandpass FSS. Finally, the proposed FSS structure has been fabricated and measured using free space measurement setup, to show the effectiveness of theoretical results. The measured results show good agreement with simulated results at normal and oblique incidence angle.

scholarly journals A Switchable Ultra-Wideband Metamaterial Absorber with Polarization-Insensitivity and Wide-incident Angle at THz Band

2021 ◽  
Vol 8 ◽  
Author(s):  
Liansheng Wang ◽  
Dongyan Xia ◽  
Quanhong Fu ◽  
Xueyong Ding ◽  
Yuan Wang
Keyword(s):  
Incident Angle ◽  
Ground Plane ◽  
Surface Current ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Ultra Wideband ◽  
Absorption Mechanism ◽  
Te Mode ◽  
Polarization Insensitivity ◽  
High Absorption

In this paper, we report a switchable ultra-wideband metamaterial absorber with polarization-insensitivity and wide-incident angle at THz band which is composed of VO2 disk, polyimide dielectric substrate, and gold ground plane. The results show that the absorption is greater than 90% from 3.5–8 THz for a temperature of 300 K and this absorption band disappears when the temperature rises to 350 K. The absorption property of our proposed metamaterial absorber is insensitive to polarization states and angles and it can withhold high absorption of more than 80% for wide-incident angles, up to 60° for TE mode and TM mode. The wideband absorption mechanism is elucidated using an effective medium and surface current analysis.

Paper‐based uniplanar ultra‐wideband frequency‐selective surface design

2019 ◽  
Vol 55 (9) ◽  
pp. 506-508 ◽  
Author(s):  
H.J. Kim ◽  
S.S. Cho ◽  
O.B. Kwon ◽  
Y.J. Kim ◽  
I.P. Hong
Keyword(s):  
Frequency Selective Surface ◽  
Ultra Wideband ◽  
Surface Design ◽  
Frequency Selective
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