Design of Dual-Band Terahertz Perfect Metamaterial Absorber Based on Circuit Theory

Liu, Zhongmin; Liang, Guo; Zhang, Qingmao

doi:10.3390/molecules25184104

Cited by 12 publications

(7 citation statements)

References 41 publications

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“…The G-RIS structure can be modeled as (R-L-C) circuit. The resistive and conductive part in Equation ( 22) is due to the graphene meta-atoms while, the capacitive part is due to the gap between the patches, so this part can be concluded as [35]: The total impedance Z in can be identified by calculating at first the value of the Z 1 with the normal incident THz wave which can be derived in:…”

Section: Thz Graphene Reconfigurable Intelligent Surfaces (G-ris) Des...mentioning

confidence: 99%

Programmable Beam-Steering Capabilities Based on Graphene Plasmonic THz MIMO Antenna via Reconfigurable Intelligent Surfaces (RIS) for IoT Applications

et al. 2022

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The approaching sixth-generation (6G) communication network will modernize applications and satisfy user demands through implementing a smart and reconfigurable system with a higher data rate and wider bandwidth. The controllable THz waves are highly recommended for the instantaneous development the new technology in wireless communication systems. Recently, reconfigurable intelligent surfaces (RIS), also called codded/tunable programmable metasurfaces, have enabled a conspicuous functionality for THz devices and components for influencing electromagnetic waves (EM) such as beam steering, multi-beam-scanning applications, polarization variation, and beam focusing applications. In this article, we proposed a graphene plasmonic two-port MIMO microstrip patch antenna structure that operates at a 1.9 THz resonance frequency. An E-shape MTM unit cell is introduced to enhance the isolation of the antenna from −35 dB to −54 dB. An implementation of controllable and reconfigurable surfaces based on graphene meta-atoms (G-RIS) placed above the radiating patches with a suitable separated distance to control the radiated beam to steer in different directions (±60°). The reconfigurable process is carried out via changing the (ON/OFF) meta-atoms states to get a specific code with a certain beam direction. The gain enhancement of the antenna can be implemented through an artificial magnetic conductor (AMC) based on graphene material. The G-AMC layer is located underneath the (MIMO antenna, G-RIS layer) to improve the gain from 4.5 dBi to 10 dBi. The suggested antenna structure results are validated with different techniques CST microwave studio and ADS equivalent circuit model. The results have asymptotic values. So, the proposed design of the MIMO antenna that is sandwiched between G-RIS and G-AMC is suitable for IoT applications.

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Section: Thz Graphene Reconfigurable Intelligent Surfaces (G-ris) Des...mentioning

confidence: 99%

Programmable Beam-Steering Capabilities Based on Graphene Plasmonic THz MIMO Antenna via Reconfigurable Intelligent Surfaces (RIS) for IoT Applications

et al. 2022

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“…It has an extremely narrow absorption peak with absorption of 99.5% at 0.523 THz with a quality factor of 37. The team of Li Y R proposed a terahertz metamaterial absorber based on metal rings with different radii loaded on the dielectric layer [ 26 ]. It has two absorption peaks to work as a biosensor at 2.335 THz and 4.215 THz with an absorption up to 99.99%.…”

Section: Introductionmentioning

confidence: 99%

A Photoexcited Switchable Dual-Function Metamaterial Absorber for Sensing and Wideband Absorption at THz Band

Wang

Xia

et al. 2022

Nanomaterials

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Based on the tunable conductivity of silicon as a function of incident pump power, a photoexcited switchable dual-function metamaterial absorber for sensing and wideband absorption at the THz band is designed in this paper. The absorber has an absorption peak at 2.08 THz with the absorption up to 99.6% when the conductivity of silicon is 150 Sm−1, which can be used for sensing. The refractive index sensitivity of the absorption peak is up to 456 GHz/RIU. A wideband absorption is generated from 3.4 THz to 4.5 THz with the bandwidth of 1.1 THz as the conductivity σsi = 12,000 Sm−1. The generation mechanism of the sensing absorption peak and wideband absorption is explained by monitoring the surface current, electric, and magnetic field distribution at some absorption frequencies. It has the advantages of being simple and having a high sensitivity, and wideband absorption with wide application prospects on terahertz communication, electromagnetic stealth, and biochemical detection.

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“…Multilayered absorbers 7 formed of graphene metamaterial have been modeled through equivalent circuits and analytical expressions. Closed‐form expressions 8 of physical parameters of dual‐band absorbers have been developed. Gold square patches 9 have been designed on a single‐layered graphene sheet over a silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

Design of graphene‐constituted Frequency Selective Surface‐based perfect absorbers in THz regime—A circuit analysis approach

Das

Mandal

2022

Int J Numerical Modelling

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In this article, novel designs of two different types of graphene‐based absorbers of arbitrary geometry have been investigated. The first absorber uses a graphene sheet and an array of metallic patches on silicon substrate for dual‐band absorption without the application of chemical potential. The second absorber is formed of a combination of graphene and metallic patches on the same substrate and is tunable over the frequency range 6.2–6.6 THz. Tunability is employed by electrostatic biasing of graphene patches from 0.4 to 1 eV. Using only a single layer of patterned graphene patches of two different sizes loaded around a square‐shaped metallic patch on SiO2 substrate, an absorption bandwidth of 500 GHz is exhibited. The proposed absorbers are analyzed rigorously by an equivalent circuit model (ECM). The validation of ECM analysis is done through full‐wave simulations in CST 2021.

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Design of Dual-Band Terahertz Perfect Metamaterial Absorber Based on Circuit Theory

Cited by 12 publications

References 41 publications

Programmable Beam-Steering Capabilities Based on Graphene Plasmonic THz MIMO Antenna via Reconfigurable Intelligent Surfaces (RIS) for IoT Applications

Programmable Beam-Steering Capabilities Based on Graphene Plasmonic THz MIMO Antenna via Reconfigurable Intelligent Surfaces (RIS) for IoT Applications

A Photoexcited Switchable Dual-Function Metamaterial Absorber for Sensing and Wideband Absorption at THz Band

Design of graphene‐constituted Frequency Selective Surface‐based perfect absorbers in THz regime—A circuit analysis approach

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