Radiation characteristics of femtosecond laser-induced plasma channel Vee antenna
Radiation characteristics of femtosecond laser-induced plasma channel Vee antenna
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DOI：
10.1063/1.4922083
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发表时间：
2015-06
影响因子：
2.2
通讯作者：
Yun-Sik Choe;Z. Hao;Jingquan Lin
中科院分区：
文献类型：
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作者：
Yun-Sik Choe;Z. Hao;Jingquan Lin
本文研究了一种由飞秒激光脉冲在空气中产生的一组激光等离子体细丝组成的虚拟可重构等离子体v型天线。计算结果表明，随着腿长的增加，辐射方向图变得更加复杂，辐射增益呈现先快速上升后逐渐饱和的趋势，但辐射方向图和增益受等离子体电导率的影响不大；特别是当等离子体电导率σ = 100S/m时，Vee天线的增益可达到铜天线的80%左右。天线的辐射效率对天线腿的半径有很强的依赖性，当通道半径约为10 mm时，可以获得65%的效率，认为具有适当的性能。顶点角的变化会导致辐射方向图的显著变化，影响增益；在600 MHz和σ = 100 S/m条件下，第三共振天线腿长最大增益和良好指向性的最佳顶点角为74°。…
A virtual reconfigurable plasma Vee antenna consisting of a set of laser plasma filaments produced by femtosecond laser pulses in air is investigated in this paper. The calculation results show that radiation pattern becomes more complex and gain shows initially rapid rise but gradually saturate as the leg length increases, but the pattern and gain are not seriously affected by the plasma conductivity; particularly, the gain of the Vee antenna with plasma conductivity σ = 100S/m can reach about 80% of that of a copper antenna. Radiation efficiency of the antenna has shown a strong dependence on radius of the antenna leg, and an efficiency of 65%, considered to have a proper performance, can be obtained with the channel radius of about 10 mm. Apex angle variation can lead to significant change of the radiation pattern and influence the gain; the best apex angle corresponding to maximal gain and good directivity for the third resonance antenna leg length is found to be at 74° at 600 MHz and σ = 100 S/m. The...