复合振子天线辐射特性的数值模拟
Numerical simulations on radiation properties of combined-oscillator antenna
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摘要: 讨论了由电单极子和磁振子组合而成的复合振子天线结构和工作原理，用时域有限差分方法模拟了天线的辐射特性，计算了天线从同轴线的馈电效率，对于单极脉冲和双极脉冲馈源，馈电效率分别为65%和81%。给出了天线的电压驻波比、辐射近场和远场、能量方向图等。模拟结果表明：在H面内辐射方向图是轴线对称的，其形状是心型；在E面内，方向图关于轴线不对称，辐射最大值方向向上偏离大约15°。这种天线具有宽带特性和较高的馈电效率，适合于超宽带电磁脉冲辐射的天线阵列的应用。Abstract: This paper discusses the combined-oscillator (CO) antenna which is composed of an electric monopole and a magnetic oscillator. The finite-difference time-domain method is applied to simulate the radiation properties of the CO antenna. The efficiency of feeding from the coaxial line to the antenna is calculated. The feeding efficiencies are 65% and 81% for the mono polar and bipolar pulse excitations. The numerical results of the voltage standing-wave ratio, radiated near- and far-fields, and energy patterns are presented. The numerical simulation results demonstrate that the H-plane pattern is symmetrical about the axis with the cardiac type, and the E-plane pattern is not symmetrical about the axis with an up-shift of 15°.This kind of antenna has the broad band property and high feeding
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