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对等角平面螺旋天线进行RWG边元建模,利用矩量法求天线表面电流,并进一步得到天线的输入阻抗、天线转移函数和脉冲辐射波形。研究显示:在工作频带内,天线的输入阻抗值约为自互补结构天线的输入阻抗理论值188.5Ω(满足巴比涅-布克原理[1]),即空间本征阻抗之一半,在超宽频带内,天线的转移函数具有平坦的幅频特性和较好的线性相频特性,用作脉冲辐射天线时,辐射电场波形具有高斯二次微分特性。
The isosurface planar helical antenna was modeled as a RWG element. The surface current of the antenna was calculated by the method of moment, and the antenna input impedance, antenna transfer function and pulse radiation waveform were obtained. The research shows that the input impedance of the antenna is about 188.5Ω (satisfying the Babbit-Bob theory [1]) of the input impedance of the self-complementary structure antenna in the working frequency band, that is, one half of the space intrinsic impedance, In the wideband, the transfer function of the antenna has a flat amplitude-frequency characteristic and a good linear phase-frequency characteristic. When used as a pulsed radiation antenna, the radiation electric field waveform has Gaussian quadratic differential characteristics.