Microwaves Scattering by Underdense Inhomogeneous Plasma Column

Zhang, Lin; Ouyang, Jiting

doi:10.1088/1009-0630/18/3/09

Cited by 16 publications

(5 citation statements)

References 23 publications

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“…There have been several studies [1,2,4] on plasma as the microwave reflector or the absorber based on its application in the field of RADAR communication. Shen et al observed that plasma with density above n ≥ 1.2 × 10 18 m −3 , produced by using low ionisation energy organic gas microwaves of X-band can be absorbed [6]. A similar study has been carried out by Zhang and Scharer, where plasma was generated using low ionisation potential gas such as tetrakis (dimethylamino) ethylene (TMAE) [7,8].…”

Section: Introductionmentioning

confidence: 82%

A computer modelling and its partial experimental validation to study the attenuation of electromagnetic waves in plasma using CST MICROWAVE STUDIO®

et al. 2021

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There is a huge interest among the scientific fraternity to generate plasma that can selectively absorb or reflect the incident microwaves. Simulations have been carried out to study the absorption of microwaves in plasma using plane wave as a source. In real experiments, the source of microwaves is not always a plane wave and hence the exact simulated replication of the experiment cannot be done using a plane wave source. In order to generate the exact experimental conditions, a horn antenna has been designed and used as a source. A computer model to study the attenuation of X-band (8-12) microwaves in a plasma medium is prepared and partially validated using suitable initial experiments. The study can be extended to any target microwave frequency band. The present work discusses the preliminary simulations that are carried out to study the effect of plasma frequency (ω p ) and collisional frequency (υ c ) on attenuation of microwaves (MW) of 8-12 GHz using CST®MWS®. The plasma is treated as a Drude dispersive material whose properties are governed by two plasma parameters, namely plasma frequency (ω p ) and collisional frequency (υ c ). The simulation is carried out on an array of plasma tubes enclosed in a housing made of teflon. This chamber is then illuminated with microwaves using a horn antenna unlike other simulations where the source of the signal is a plane wave. Using a horn antenna as the transmitter and receiver allows exact simulation of the experimental conditions in the laboratory. The amount of attenuation is measured by considering the difference in return losses with and without plasma. The attenuation of incident microwave is studied by varying plasma frequency from 0.02 GHz to 3 GHz at a fixed collisional frequency of 10 10 S −1 . The simulation is also carried out by varying υ c from 10 8 to 10 11 S −1 at a constant ω p . An experiment to validate the simulation is designed to validate the simulation results. For experimental purpose, fluorescent tube array (FTA), which is a series connection of commercially available tubes is excited using a high-frequency power supply of suitable voltage. The simulation and initial experimental results are compared and are in good agreement with each other. This model serves as a tool to study the attenuation of MW in plasma with given ω p and υ c well before the experiment is carried out. This can also be used to select optimum working points for further experiments.

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Section: Introductionmentioning

confidence: 82%

A computer modelling and its partial experimental validation to study the attenuation of electromagnetic waves in plasma using CST MICROWAVE STUDIO®

et al. 2021

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“…cylindrical plasma. Moreover, in addition to collision absorption, the columnar plasma also enables electromagnetic wave scattering to further reduce reflections [27,28]. Hence, the design is made by placing several mutually parallel cylindrical plasmas in the plane where the hyperplane is located.…”

Section: Simulation and Experimentation Of Structures Formed By The C...mentioning

confidence: 99%

Composite wave-absorbing structure combining thin plasma and metasurface

Hao¹,

Xu³

et al. 2023

Plasma Sci. Technol.

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In order to solve the thickness dependence of plasma absorption of electromagnetic waves and further reduce the backward radar scattering cross section (RCS) of target, we designed a novel composite structure of a metasurface and plasma. A metasurface with three absorption peaks is designed by means of an equivalent circuit based of an electromagnetic resonance type metamaterial absorber. The reflection absorption by the composite structure is numerically and experimentally verified. The finite integration method was used to simulate the composite structure of finite size to obtain the radar cross section. The experimental measurements of electromagnetic wave reflection are conducted by the vetor network analyser (Keysight N5234A) and horn antennas, etc. The research shows that the absorption capacity of this composite structure is substantially improved compared to either the plasma or the metasurface, and it is more convenient for application due to the low plasma thickness requirement and easy fabrication.

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“…To analyse the optical characteristics of the EM wave, the reflection and transmission coefficients are introduced as an absolute square of Equations ( 16) and (17). Considering expressions of the reflection and transmission amplitudes and using Equations ( 6) and ( 18), the reflection and transmission coefficients of the EM wave can be derived as…”

Section: Physical Model Of Wave Propagation In Bounded Plasmamentioning

confidence: 99%

“…[10][11][12] Microwave scattering from homogeneous and inhomogeneous plasma was studied in detail by Laroussi, Shi, Helaly, and others. [13][14][15][16][17] The scattering matrix method (SMM) is widely used to investigate EM wave propagation in multilayer, non-uniform, magnetized, and unmagnetized plasma slabs. [18][19][20][21][22] Theoretical and numerical methods such as finite-difference time-domain (FDTD), finite difference frequency domain (FDFD), impedance matching (IM), and Green's function volume integral (GFVI) were introduced and recently were developed to simulate propagation characteristics of wide ranges of EM wave in different types of bounded plasmas.…”

Section: Introductionmentioning

confidence: 99%

Investigation of near cut‐off properties of electromagnetic wave propagation in homogeneous, collisional plasma slab

Noori

2022

Contributions to Plasma Physics

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Fluctuations in the signal of optical coefficients of propagative electromagnetic (EM) waves in plasma, can cause problems in phase analysis, especially in microwave diagnostic systems which are based on the reflection, and transmission of EM waves in the vicinity of cut-off layer of the plasma. In this study, optical properties of EM wave propagation in a single layer, homogeneous, and partially ionized plasma slab are investigated. For realistic analysis of propagation characteristics of the EM wave in the plasma slab, multiple reflections of the EM wave from plasma-vacuum boundaries, known as incoherent internal reflections (IIR) are considered. Optical coefficients of the EM wave are numerically simulated in terms of the plasma parameters and wave frequency, with and without consideration of the incoherent internal reflections effect. It was found that in the low-loss collision regime, the cut-off fluctuations of the optical coefficients can be filtered considering the incoherent internal reflections of the EM wave. Such analysis of the EM wave propagation in plasma slab can be considered the primary physical design of diagnostic facilities and EM wave absorbing structures operating in the cut-off frequency ranges.

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Microwaves Scattering by Underdense Inhomogeneous Plasma Column

Cited by 16 publications

References 23 publications

A computer modelling and its partial experimental validation to study the attenuation of electromagnetic waves in plasma using CST MICROWAVE STUDIO®

A computer modelling and its partial experimental validation to study the attenuation of electromagnetic waves in plasma using CST MICROWAVE STUDIO®

Composite wave-absorbing structure combining thin plasma and metasurface

Investigation of near cut‐off properties of electromagnetic wave propagation in homogeneous, collisional plasma slab

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