高倍频程火山烟雾超宽带平板天线

Ultra-wideband flat antenna of volcano smoke with high octave

在3m×1.5m×0.2m的尺寸限制下,基于电阻加载技术设计了一种新颖的高倍频程火山烟雾超宽带平板天线。该天线采用同轴馈电,通过扫参仿真优化低频匹配电路,实现了从标准的传输线阻抗(50Ω)到自由空间波阻抗(377Ω)的完美渐变,获得了最佳的低频拓展辐射性能。仿真结果表明天线在300kHz~300MHz的频带范围内驻波比(VSWR)小于2.5(S<-7.2dB),首次实现了1000倍频程超宽带辐射,远场辐射方向图表明天线在前向实现了近似均匀场辐射。研制了实物天线,并开展了实验测量,实验结果表明天线在前向实现了近似均匀场辐射,天线的波形保真特性良好,天线背向辐射小于5%。

Under the size limit of 3 m×1.5 m×0.2 m, a novel ultra-wideband flat antenna of volcano smoke with high octave is presented in this paper based on the loaded resistance technology. The antenna is fed by coaxial line, and the perfect transition from the transmission line(50Ω) to the free space(377Ω) is realized through the optimization of low frequency matching circuit. The optimum low-frequency extended radiation performance is obtained with sweeping parameter simulation. The simulation results show that the voltage standing wave ratios(VSWR) of the antenna is less than 2.5(S<-7.2 dB) in the frequency range from 300 kHz to 300 MHz, and the ultra-wideband of 1000 octave is realized for the first time. The experimental results show that the antenna achieves approximately uniform field radiation in the forward direction with high quality waveform fidelity, and the back radiation of the antenna is less than 5%.