Experimental Investigation on Electromagnetic Attenuation by Low Pressure Radio-Frequency Plasma for Cavity Structure

HE Xiang (何湘); ZHANG Yachun (张亚春); CHEN Jianping (陈建平); CHEN Yudong (陈玉东); ZENG Xiaojun (曾小军); YAO Hong (姚洪); TANG Chunmei (唐春梅)

doi:10.1088/1009-0630/18/1/11

Plasma Science and Technology > 2016 > 18(1): 62-66. > DOI: 10.1088/1009-0630/18/1/11

HE Xiang (何湘), ZHANG Yachun (张亚春), CHEN Jianping (陈建平), CHEN Yudong (陈玉东), ZENG Xiaojun (曾小军), YAO Hong (姚洪), TANG Chunmei (唐春梅). Experimental Investigation on Electromagnetic Attenuation by Low Pressure Radio-Frequency Plasma for Cavity Structure[J]. Plasma Science and Technology, 2016, 18(1): 62-66. DOI: 10.1088/1009-0630/18/1/11

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Experimental Investigation on Electromagnetic Attenuation by Low Pressure Radio-Frequency Plasma for Cavity Structure

1School of Science, Hohai University, Nanjing 210098, China 2School of Science, Nanjing University of Science & Technology, Nanjing 210094, China 3Beijing Aeronautical Technology Research Center, Beijing 100076, China 4School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China 5Navy Logistics Department of PLA, Beijing 100841, China

Funds: supported by National Natural Science Foundation of China (No. 51107033) and the Fundamental Research Funds for the Central Universities of China (No. 2013B33614)

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Received Date: August 28, 2015

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Abstract

Abstract

This paper reports on an experiment designed to test electromagnetic (EM) atten?uation by radio-frequency (RF) plasma for cavity structures. A plasma reactor, in the shape of a hollow cylinder, filled with argon gas at low pressure, driven by a RF power source, was produced by wave-transmitting material. The detailed attenuations of EM waves were investigated under different conditions: the incident frequency is 1-4 GHz, the RF power supply is 13.56 MHz and 1.6-3 kW, and the argon pressure is 75-200 Pa. The experimental results indicate that 5-15 dB return loss can be obtained. From a first estimation, the electron density in the experiment is approximately (1.5-2.2)×1016 m-3 and the collision frequency is about 11-30 GHz. The return loss of EM waves was calculated using a finite-difference time-domain (FDTD) method and it was found that it has a similar development with measurement. It can be confirmed that RF plasma is useful in the stealth of cavity structures such as jet-engine inlet.
- plasma stealth,
- radio frequency,
- inlet,
- FDTD method

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References

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