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口径天线冲激脉冲辐射场方向性的时域分析
Analysis of aperture antenna radiation characteristics fed by impulse signal on time domain
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摘要: 为分析口径天线辐射场方向性，在计算等效面磁流的同时，引入等效面电流的作用，对辐射远场方向性进行了修正，解析公式更适合描述自由空间中口径天线的辐射场；在时间域对冲激脉冲口径辐射场方向性进行分析，得到以下结论：馈入脉冲宽度变宽、口径尺寸减小、口径场幅度锥削分布，以及球面波前均会降低辐射场方向性；辐射场存在时域波形延拓现象，即存在空间色散问题；球面波使口径辐射场方向性迅速恶化，在远区得到一个主轴附近峰值场强相对平坦，而在一定角度峰值场强迅速下降的场。Abstract: The influence of equivalent surface currents was introduced and the farfield directivity was amended which was more adaptive to describe the aperture radiation characteristics.It was concluded that wide impulse,small aperture,severe taper-ed field in aperture,or obvious spherical wavefront would lead to bad directivity.By holding the spherical wavefront in proper ex-tent,it could achieve a farfield with flat lobe around boresight and sharp falling at certain angle.By investigating the radiation characteristics of different aperture in time domain,it was easier to analyze the practical impulse antenna in a short time.
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