應(yīng)用球模展開實(shí)現(xiàn)近遠(yuǎn)場變換
NEAR-FIELD FAR-FIELD TRANSFORMATIONS USING SPHERICAL-WAVE EXPANSIONS
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摘要: 本文討論了應(yīng)用球模展開實(shí)現(xiàn)近遠(yuǎn)場變換的理論和計(jì)算方法。提出了提高精度,同時(shí)減少占用內(nèi)存的數(shù)據(jù)處理方法和充分利用軟件功能在微機(jī)上實(shí)現(xiàn)近遠(yuǎn)場變換的技術(shù)。用典型問題檢驗(yàn)了理論和計(jì)算機(jī)軟件的可行性。對(duì)x波段喇叭給出了實(shí)測(cè)的遠(yuǎn)場、由近場數(shù)據(jù)推算的遠(yuǎn)場以及理論計(jì)算的遠(yuǎn)場之間的比較,三者符合得很好。
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關(guān)鍵詞:
- 電磁場; 近遠(yuǎn)場變換; 球面掃描; 探針修正
Abstract: The theory and numerical techniques of near-field far-field transformations using spherical-wave expansions are studied. The efficient data processing methods to achieve a high degree of accuracy in transformations and at the same time to reduce the memory capacity are developed. The analytical modei is used to validate the feasibility of the theory and computer software. For an X-Band horn antenna, the far-field pattern computed from near-field data, the measured far-field pattern and the far-field patter from theoretical integral equations are compared, demonstrating the excellent numerical accuracy of the transformation techniques. -
A. D. Yaghjian, IEEE Trans. on AP, AP-34(1986)1, 30-45.[2]J. R. James, L. W. Longdon, Alta Freq., 38(1969)5, 286-290.[3]P. F. Wacker, Inst, Elec. Eng. Conf. Publ. 113, Conf. Precision Electromagn. Measurements, London, July (1974), 286-288.[4]J. A. Stratton, Electromagnetic Theory, McGraw Hill, New York, (1941), ch:7.[5]J. Appel-Hansen, The Handbook of Antenna Design,Volume 1, London, Peregrinus, (1982), ch. 8.[6]A. D. Yaghjian, Electron. Letters, 20(1984)5, 195-196.[7]A. V. Oppenheim, R. W. Schafer, Digital Signal Processing, Prentice-Hall Inc., 1975, ch. 3. -
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