Analysis of radiation enhancement phenomenon of isotropy plasma layer coated cylinderical metal antenna

The blackout problem suffered by hypersonic vehicles as they re-enter the atmosphere is essential for effective communication of vehicles. Aiming to solve this problem, in paper, we proposed an antenna–sheath–plasma layer configuration, which a thin plasma covered cylindrical metal antenna model employed investigate radiation enhancement phenomenon solving dispersion equation electromagnetic mode under optimized parameter conditions. Analytical results show that when neutral gas pressure low (<i>p =</i> 0.5 mTorr) and radius triple skin depth, thickness sheath between surface about several Debye lengths, azimuthally symmetric wave (<i>m</i> = 0 mode) propagates along belongs fast (the phase velocity greater than light speed), there exists critical frequency <i>ω</i><sub>pe </sub>(or density <i>n</i><sub>0</sub>), above propagating becomes evanescent wave; propagation characteristic, normalized (<i>ι</i>/<i>λ</i><sub>De</sub>)<sub>pha (<i>ι</i>/<i>λ</i><sub>De</sub>)<sub>att</sub>), constant (or attenuation constant) begins increase decrease) sharply, indicates significant change property mode; most importantly, <i>ω</i>/2π 1 GHz, one tenth whole thickness, owing electron resonance antenna-sheath-plasma effect, maximum intensity exhibits elliptical-like profile near <i>ω</i><sub>pe</sub>/<i>ω</i> ≈ 1.33, respectively, while only single-point occurs at frequencies far from GHz range. These conclusions not provide method or alleviate faced atmosphere, but also have potential applications high-resolution imaging induced plasmonic micro-nano sized enhanced phased array antennas.