Effect of Driving Frequency on Reduction of Radar Cross Section Due to Dielectric-Barrier-Discharge Plasma in <i>Ku</i>-Band

Song, Sanghun; Cho, Changseok; Oh, Taejoo; Kim, Sangin; Ahn, Wookhyun; Yook, Jong-Gwan; Lee, Jangjae; You, S. J.; Yim, Jinwoo; Ha, Jungje; Bae, Gihun; You, Heung Cheol; Lee, Yong-Shik

doi:10.1109/tps.2021.3068462

Cited by 9 publications

(10 citation statements)

References 37 publications

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“…Assuming 684 GHz of collision frequency at 0.3 atm [8], the extracted plasma frequency is 240 Grad/s, which gives the best match between the measured and simulated RCS results. This corresponds to an electron density of 1.81 × 10 13 cm −3 .…”

Section: Experimental Results and Analysismentioning

confidence: 89%

“…The plasma characteristics generated from the DBD generator considerably vary depending on the frequency and voltage of the bias signal as well as the surrounding gas In the case of the proposed generator, the gap between the electrode and ground (target) was 4.572 mm, which is maintained by the dielectric rim between the two; thus, the breakdown voltage of the proposed plasma generator was approximately 8 kV peak-topeak at 0.3 atm according to Paschen's law [8,12]. Therefore, plasma was stably generated when a higher voltage was applied.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…Assuming 684 GHz of collision frequency at 0.3 atm [8], the extracted plasma fre- Figure 7 shows the measured RCS of the 200 × 200 mm 2 copper plate and when the proposed DBD generator is attached to this plate. The figure also shows the changes in the RCS when the plasma is generated, with and without the dielectric rim.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…For comparison, Figure 7 also shows the full-wave simulated results obtained thru CST [11]. Simulations are performed based on the Drude model in Equation ( 3), which is a popular model that describes its interaction between plasma and electromagnetic waves [8,9,12,15,16]. For comparison, Figure 7 also shows the full-wave simulated results obtained thru CST [11].…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The real part of the plasma dielectric constant is 1 or less, and the imaginary part has a relatively large value such that the loss is higher than that of other materials. Therefore, extensive research has been conducted based on the suitability of plasma in detection technology [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Plasma Generator with Dielectric Rim and FSS Electrode for Enhanced RCS Reduction Effect

Cho

Ahn

et al. 2021

Sensors

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In this study, a method was experimentally verified for further reducing the radar cross-section (RCS) of a two-dimensional planar target by using a dielectric rim in a dielectric barrier discharge (DBD) plasma generator using a frequency selective surface (FSS) as an electrode. By designing the frequency selective surface such that the passbands of the radar signal match, it is possible to minimize the effect of the conductor electrode, in order to maximize the RCS reduction effect due to the plasma. By designing the FSS to be independent of the polarization, the effect of RCS reduction can be insensitive to the polarization of the incoming wave. Furthermore, by introducing a dielectric rim between the FSS electrode and the target, an additional RCS reduction effect is achieved. By fabricating the proposed plasma generator, an RCS reduction effect of up to 6.4 dB in X-band was experimentally verified.

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Section: Experimental Results and Analysismentioning

confidence: 89%

Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasma Generator with Dielectric Rim and FSS Electrode for Enhanced RCS Reduction Effect

Cho

Ahn

et al. 2021

Sensors

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Measurement of re-entry plasma density using microwave reflectometer in laboratory

Shin

Kim

Lee

et al. 2022

Review of Scientific Instruments

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A laboratory-scale experiment was conducted to reproduce plasma with properties similar to re-entry plasma and measure the plasma density using a microwave reflectometer system. To reproduce a similar re-entry plasma, a high-temperature refractory anode vacuum arc plasma method was used among arc plasma discharge methods, and arc plasma having high temperature, high speed, and high-density plasma characteristics was discharged inside a vacuum chamber. A hot refractory anode made of tungsten was used to show high-temperature plasma characteristics, and high-density plasma characteristics were demonstrated using re-evaporation around the anode. In addition, high-speed plasma characteristics were exhibited using a brass cathode. This kind of arc plasma discharge has a high temperature and is characterized by high fluctuation. It was determined that a microwave reflectometer system with good spatial resolution and non-invasiveness would be suitable to measure plasma with these characteristics. The reflection coefficient was measured using a reflector system by comparing the voltage between the traveling wave applied to the plasma and the reflected wave reflected by the plasma, and the technique of analyzing the plasma density using the difference between these reflection coefficients was used. In this study, the plasma density according to the pressure change was typically measured as 1012–1013 cm−3, which showed a similar tendency to the result of measuring the actual re-entry plasma density.

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Design of a wideband and tunable radar absorber

Gao,

Dou,

Peng

et al. 2023

Mater. Res. Express

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To effectively address the challenges posed by intricate and dynamic electromagnetic environments, we propose a wideband and tunable radar absorber in this paper. The proposed absorber, composed of graphene capacitor, plasma enclosed within a sealed glass cavity, radar absorbing material (RAM), FR-4 and copper plate, allows for tunable radar absorbing performance through the manipulation of the electromagnetic properties of the graphene capacitor and plasma. Based on the equivalent circuit model, the reflectivity of the radar absorber is analyzed using transmission line theory (TLT). Good agreement is observed between the full-wave simulations and the TLT. The study thoroughly investigates the influence of graphene, plasma, and RAM components, as well as their sequential arrangement within the radar absorber, on its reflectivity, expounding the fundamental mechanism of these materials' synergistic integration. Additionally, the effects of key factors, including the surface resistance R_g of graphene, plasma frequency w_p, collision frequency v_p and plasma thickness t_plasma, on the radar absorbing performance are examined. Our findings reveal that adjusting surface resistance R_g controls the absorbing amplitude, and manipulation of the plasma frequency and collision frequency tunes the absorbing frequency and effective absorbing band. By appropriately adjusting the surface resistance R_g of graphene, plasma frequency w_p and collision frequency v_p, the proposed radar absorber exhibits superior performance in the frequency range of 1GHz to 10GHz. The radar absorber we propose serves as a significant reference for the application of tunable radar absorbers and adaptive radar stealth techniques.

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Effect of Driving Frequency on Reduction of Radar Cross Section Due to Dielectric-Barrier-Discharge Plasma in Ku-Band

Cited by 9 publications

References 37 publications

Plasma Generator with Dielectric Rim and FSS Electrode for Enhanced RCS Reduction Effect

Plasma Generator with Dielectric Rim and FSS Electrode for Enhanced RCS Reduction Effect

Measurement of re-entry plasma density using microwave reflectometer in laboratory

Design of a wideband and tunable radar absorber

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