T形天线的研究

Characteristics simulation of T antennas located in a valley

系统地研究位于山谷间T形天线的电特性。采用矩量法求解天线和地面上的静电荷分布密度及电流分布密度,进而计算了T形天线与地面之间的静电容和天线的输入电抗,数值结果与实验结果吻合良好。同时研究了引线及顶线的各项参数变化对天线的有效高度、增益、输入电抗、辐射电阻及静电容的影响。研究表明,增加引线数目、引线间距和加长顶线长度均可以增加天线系统的静电容,减小输入电抗的模值,并使天线的增益有所改善。

The characteristics of the T antennas located in a valley are investigated in this paper. The static charge and current distributions on the antenna and the ground is calculated respectively with the method of moments, then the static capacitance between the antenna and the ground and the input reactance are determined, which are in good agreement with the experimental results. The affection of parameter variation of down lead wires and top loading wires on effective height, radiation pattern, input reactance, radiation resistor and static capacitance is discussed. It is hold that one can increase static capacitance, reduce mode of input reactance and enhance the antenna gain by increasing down lead wires, their distances or lengthening the top loading wires.