球模式展開理論近遠(yuǎn)場變換及快速算法
doi: 10.11999/JEIT150203 cstr: 32379.14.JEIT150203
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1.
(西北工業(yè)大學(xué)無人機(jī)特種技術(shù)重點(diǎn)實(shí)驗(yàn)室 西安 710065) ②(西北工業(yè)大學(xué)電子信息學(xué)院 西安 710072)
基金項(xiàng)目:
國家自然科學(xué)基金(61201320, 61371023)
Near-field to Far-field Transformations Based on Spherical Wave Expansions and Fast Algorithm
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1.
(National Key Laboratory of Science and Technology on Unmanned Aerial Vehicle, Northwestern Polytechnical University, Xi&rsquo
Funds:
The National Natural Science Foundation of China (61201320, 61371023)
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摘要: 基于球模式展開理論的近遠(yuǎn)場變換是天線球面近場測量系統(tǒng)實(shí)現(xiàn)的關(guān)鍵，它將待測天線在空間建立的場展開成球面波函數(shù)之和，由于其計(jì)算公式復(fù)雜，因而計(jì)算耗費(fèi)時(shí)間長。該文在實(shí)際計(jì)算中利用快速傅里葉變換及矩陣的思想可以大幅度提高程序運(yùn)行速度，節(jié)省計(jì)算時(shí)間。采用該方法對角錐喇叭天線的近遠(yuǎn)場數(shù)據(jù)進(jìn)行仿真驗(yàn)證，結(jié)果表明外推遠(yuǎn)場的結(jié)果和理論值吻合良好，說明了該方法在保證計(jì)算精度的同時(shí)，可縮短計(jì)算時(shí)間。
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關(guān)鍵詞:
- 天線球面近場測量 /
- 球模式展開理論 /
- 近遠(yuǎn)場變換 /
- 快速算法
Abstract: The theory of near-field to far-field transformation using spherical-wave expansions is the key to implement the spherical near-field antenna measurement system. It can develop the field in the space which is built by antenna expanding into the sum of spherical wave functions. Because of its complex formula, it will consume a long time to compute. The FFT transformation and the ideas of matrix are put into used in this paper, so the compute speed can be improved and the compute time can be saved. Using this method to testify the near-field data and the far-field data of a horn antenna, the results show that the far-field pattern computed from near-field date and the far-field pattern from theoretical integral equations are compared very well. It is approved that this method can guarantee the calculation precision and shortens the compute time at the same time. -
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