时域平面近场测量的数值分析方法
NUMERICAL ANALYSIS METHOD FOR PLANAR NEAR-FIELD MEASUREMENT IN TIME DOMAIN
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摘要: 本文以H面喇叭为例,研究了天线时域近场的运动状态,用谱域法分析了平面近场分布状况,得出采样原则,为平面近场扫描测量提供了理论依据。介绍了时域平面近场测量的近远场变换公式,包括时域和频域两种计算途径。对各自的优点作出了探讨。运用近远场变换方法计算了时域远场和频域方向图。Abstract: The movement of antenna s near-field is studied in time domain. The near field distributions are analyzed by using plane wave-spectrum method. A sampling principle is deduced for planar near-field scanning in time domain. Some methods of near-far field transfer are introduced, which can be performed through time or frequency approach. The characteristics of the two approaches are discussed. Extensive numerical results of an H-plane waveguide horn illustrate the analysis.
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