Design of a Dual Band Independently Tunable Microwave Absorber

2019 ◽  
Author(s):  
Gobinda Sen ◽  
Anumoy Ghosh ◽  
Santanu Das
Keyword(s):  
Microwave Absorber ◽  
Dual Band ◽  
Tunable Microwave

Nanocomposite Graphene based Tunable Absorber for Combating Electromagnetic Pollution

2019 ◽  
Vol 15 ◽  
Author(s):  
Surekha Rani ◽  
Anupma Marwaha ◽  
Sanjay Marwaha
Keyword(s):  
Reflection Coefficient ◽  
Traffic Congestion ◽  
Microwave Absorber ◽  
Electromagnetic Properties ◽  
Electric Conductor ◽  
High Frequency Structure Simulator ◽  
Bias Potential ◽  
External Bias ◽  
Tunable Microwave ◽  
Tunable Absorber

Background: Advancement in wireless communication technology has raised today’s living standards but consequently leads to the problems of electromagnetic (EM) air pollution as well as spectrum congestion particularly in radio frequency band. To overcome traffic congestion problem in lower bands, terahertz frequency bands are explored but EM pollution still persists as global issue which can be addressed by a tunable microwave absorber. At THz frequencies, 2-D nanostructured graphene has been observed to be less lossy than using other materials and further finds its most interesting applications on account of the plasmonic mode supported by graphene resulting in extreme device miniaturization. At micro and mm-waves graphene is resistive hence can be electronically controlled, ensuring its suitability for the design of tunable microwave absorber. Objective: Designing of a frequency reconfigurable or frequency tunable absorber is the prime objective of current work. Two-dimensional graphene absorber has been proposed here having inherent bandgap tunability property which means the electromagnetic properties of graphene can be controlled via varying external bias potential. Methods: The numerical modelling of graphene microwave absorber utilizing bulk graphene backed by glass and perfect electric conductor layer is reported in this paper. Finite element Method (FEM) based high frequency structure simulator (HFSS) platform is used to simulate the graphene absorber model. The whole structure is placed into a rectangular waveguide with two ports for absorber excitation. Results: The variation of electromagnetic properties of graphene absorber is achieved by changing bias potential and further the absorption tunability for the designed absorber is investigated in the range from 2 GHz to 18 GHz. From reflection coefficient curves, it is authenticated that -72.6 dB reflection coefficient dip has been obtained at 14 GHz for 5 volt bias potential which shifts to higher side of frequency as the potential changes from 5 volts to 25 volts. Conclusion: The results show that by increasing bias potential, absorption coefficient shifts to higher frequency and proves to be a tunable wideband absorber whose resonant frequency can changed from one value to another without changing thickness or material properties of absorber thus can effectively incorporate with antenna substrate or surface of radar.

Designed 3D heterostructure by 0D/1D/2D hierarchy for low-frequency microwave absorption in the S-band

2022 ◽  
Author(s):  
Jun Zhou ◽  
Fan Guo ◽  
Jialiang Luo ◽  
Gazi Hao ◽  
Guigao Liu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Three Dimensional ◽  
Low Frequency ◽  
Microwave Absorber ◽  
Tunable Microwave ◽  
Frequency Tunable ◽  
Electromagnetic Pollution ◽  
Designed Synthesis

Developing a low-frequency tunable microwave absorber for the normal use of sophisticated electric devices is an urgent need for electromagnetic pollution. Herein, we report the designed synthesis of a three-dimensional...

Electrically Tunable Microwave Absorber Based on Discrete Plasma-Shells

2019 ◽  
Vol 67 (10) ◽  
pp. 6523-6531 ◽  
Author(s):  
Komlan Payne ◽  
Kevin Xu ◽  
Jun H. Choi ◽  
Jay Kyoon Lee
Keyword(s):  
Microwave Absorber ◽  
Tunable Microwave

Microwave Absorbing Performance and Infrared Emissivity of Co-Doped ZnO

2011 ◽  
Vol 399-401 ◽  
pp. 880-885
Author(s):  
Shu Yuan Zhang ◽  
Quan Xi Cao
Keyword(s):  
Double Layer ◽  
Single Layer ◽  
Microwave Absorber ◽  
Dual Band ◽  
Network Analyzer ◽  
Infrared Emissivity ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Co Doped

In this paper the powders of Zn1-xCoxO (x=0, 0.01, 0.02, 0.025, 0.05, 0.1) were fabricated by the conventional solid state reaction. The crystal structure was characterized by x-ray diffraction (XRD). The electromagnetic parameters were measured using vector network analyzer (VNA), the infrared emissivity in the wavelength range of 3-5μm and 8-14μm was measured by Dual-band infrared emissivity measuring instrument. The absorption bandwidth of the double-layer microwave absorber is obviously more than that of the single-layer absorber. The bandwidth of the double-layer microwave absorber for reflection loss R<-8dB is 2.64GHz over the range of 8.2-18GHz. The thickness of the absorbers is only 4 mm. The infrared emissivity is only 0.39 in the range of 3-5μm and 0.81 in the range of 8-14μm.

Ultra-thin tunable microwave absorber using liquid crystals

2008 ◽  
Vol 44 (1) ◽  
pp. 37 ◽  
Author(s):  
V.F. Fusco ◽  
R. Cahill ◽  
W. Hu ◽  
S. Simms
Keyword(s):  
Liquid Crystals ◽  
Microwave Absorber ◽  
Tunable Microwave

Construction of sandwich-like NiCo2O4/Graphite nanosheets/NiCo2O4 heterostructures for a tunable microwave absorber

2020 ◽  
Vol 46 (11) ◽  
pp. 19293-19301 ◽  
Author(s):  
Xiaogang Su ◽  
Jun Wang ◽  
Xiaoxiao Zhang ◽  
Zijin Liu ◽  
Wei Dai ◽  
...  
Keyword(s):  
Microwave Absorber ◽  
Graphite Nanosheets ◽  
Tunable Microwave

Tunable Microwave Absorber Based on Patterned Graphene

2017 ◽  
Vol 65 (8) ◽  
pp. 2819-2826 ◽  
Author(s):  
Da Yi ◽  
Xing-Chang Wei ◽  
Yi-Li Xu
Keyword(s):  
Microwave Absorber ◽  
Tunable Microwave
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