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Author Naito, T. ♦ Yamaura, S. ♦ Fukuma, Y. ♦ Sakai, O.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ANTENNAS ♦ ARGON ♦ COMPUTERIZED SIMULATION ♦ DIELECTRIC MATERIALS ♦ ELECTRON DENSITY ♦ ELECTRONS ♦ GAIN ♦ GHZ RANGE 01-100 ♦ GLOW DISCHARGES ♦ MERCURY ♦ MICROWAVE RADIATION ♦ PLASMA ♦ SIGNALS ♦ SURFACES ♦ TUBES ♦ WAVE PROPAGATION ♦ WAVELENGTHS
Abstract This paper reports radiation characteristics of input power from a surface wave sustained plasma antenna investigated theoretically and experimentally, especially focusing on the power consumption balance between the plasma generation and the radiation. The plasma antenna is a dielectric tube filled with argon and small amount of mercury, and the structure is a basic quarter wavelength monopole antenna at 2.45 GHz. Microwave power at 2.45 GHz is supplied to the plasma antenna. The input power is partially consumed to sustain the plasma, and the remaining part is radiated as a signal. The relationship between the antenna gain and the input power is obtained by an analytical derivation and numerical simulations. As a result, the antenna gain is kept at low values, and most of the input power is consumed to increase the plasma volume until the tube is filled with the plasma whose electron density is higher than the critical electron density required for sustaining the surface wave. On the other hand, the input power is consumed to increase the electron density after the tube is fully filled with the plasma, and the antenna gain increases with increasing the electron density. The dependence of the antenna gain on the electron density is the same as that of a plasma antenna sustained by a DC glow discharge. These results are confirmed by experimental results of the antenna gain and radiation patterns. The antenna gain of the plasma is a few dB smaller than that of the identical metal antenna. The antenna gain of the plasma antenna is sufficient for the wireless communication, although it is difficult to substitute the plasma antenna for metal antennas completely. The plasma antenna is suitable for applications having high affinity with the plasma characteristics such as low interference and dynamic controllability.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-09-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 9


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