改进的NURBS-PO法分析电大平台附近天线方向图

doi:10.3969/j.issn.1001-2400.2010.05.018

J4 ›› 2010, Vol. 37 ›› Issue (5): 879-883.doi: 10.3969/j.issn.1001-2400.2010.05.018

改进的NURBS-PO法分析电大平台附近天线方向图

黄锴;贺之莉;梁昌洪

(西安电子科技大学天线与微波技术重点实验室，陕西西安 710071)

收稿日期:2009-10-24 出版日期:2010-10-20 发布日期:2010-10-11
通讯作者: 黄锴
作者简介:黄锴(1984-)，男，西安电子科技大学博士研究生，E-mail: huangkai841025@126.com．
基金资助:
“十一五”预研资助项目(51307020204);国家自然科学基金资助项目(06091030)

Improved NURBS-PO method for analyzing the disturbed pattern of an antenna around an electrically large platform

HUANG Kai;HE Zhi-li;LIANG Chang-hong

(Key Lab. of Antennas and Microwave Technology, Xidian Univ., Xi'an 710071， China)

Received:2009-10-24 Online:2010-10-20 Published:2010-10-11
Contact: HUANG Kai

摘要/Abstract

摘要：

传统的基于非均匀有理B样条(NURBS)曲面建模的物理光学(PO)方法计算天线受扰方向图时，用球面波代替真实天线的散射场，要求天线必须远离散射体．针对该问题提出了一种改进的NURBS-PO方法，用精确的天线辐射场作为入射场，不存在天线必须放置在远区的局限．此外，采用改进的Ludwig积分计算物理光学电流的曲面积分，避免了传统方法中驻相法(SPM)计算积分的理论复杂性以及通过优化方法搜索驻相点的不可靠性．数值结果与高阶矩量法的计算结果吻合良好，证明了该方法的可行性，也显示了该方法在求解高频问题时计算速度上的优势．

关键词: 非均匀有理B样条, 物理光学, Ludwig积分, 方向图

Abstract:

An improved Physics Optics(PO) method based on Non Uniform Rational B Spline(NURBS) modeling is presented to calculate the disturbed pattern of an antenna around an electrically large platform. Compared with the conventional NURBS-PO method in which the true scattered field of an antenna is replaced by the spherical wave, the new technique uses the accurate radiation field as the incident field and overcomes the limitation that the antenna must be located far away from the scatterer. The improved Ludwig integral method is applied to compute the integration of the induced current over the surface, which avoids the complicated theory and the possible invalidation in searching stationary points within the stationary phase method(SPM) method. Numerical results obtained from the proposed approach are in good agreement with those obtained from the method of moments(MOM), which confirms the feasibility of the new technique. Meanwhile, the advantage in calculation speed for solving high frequency problems is demonstrated.

Key words: NURBS, physics optics, Ludwig integral, pattern

黄锴;贺之莉;梁昌洪. 改进的NURBS-PO法分析电大平台附近天线方向图[J]. J4, 2010, 37(5): 879-883.

HUANG Kai;HE Zhi-li;LIANG Chang-hong. Improved NURBS-PO method for analyzing the disturbed pattern of an antenna around an electrically large platform[J]. J4, 2010, 37(5): 879-883.

参考文献

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改进的NURBS-PO法分析电大平台附近天线方向图

Improved NURBS-PO method for analyzing the disturbed pattern of an antenna around an electrically large platform

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