時(shí)域平面近場測量的數(shù)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面喇叭為例,研究了天線時(shí)域近場的運(yùn)動(dòng)狀態(tài),用譜域法分析了平面近場分布狀況,得出采樣原則,為平面近場掃描測量提供了理論依據(jù)。介紹了時(shí)域平面近場測量的近遠(yuǎn)場變換公式,包括時(shí)域和頻域兩種計(jì)算途徑。對各自的優(yōu)點(diǎn)作出了探討。運(yùn)用近遠(yuǎn)場變換方法計(jì)算了時(shí)域遠(yuǎn)場和頻域方向圖。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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