互阻抗精度對實(shí)現(xiàn)天線極低副瓣的限制
THE LIMITATION OF MUTUAL IMPEDANCE PRECISION TO THE SIDELOBE LEVEL OF ARRAY ANTENNA
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摘要: 實(shí)現(xiàn)極低副瓣陣列天線需要作精確的互耦補(bǔ)償.如果陣列的互阻抗(或互耦系數(shù))矩陣確知,理論上可以精確補(bǔ)償互耦的影響,從而實(shí)現(xiàn)極低副瓣接收。但無論是計(jì)算還是測量得到的互阻抗矩陣都只有一定的精度,這個(gè)精度最終決定了補(bǔ)償效果。本文研究了極低副瓣陣列天線中互耦補(bǔ)償對互阻抗精度的要求;推導(dǎo)出了互阻抗誤差與通道幅相誤差的關(guān)系;進(jìn)而得到了互阻抗誤差與副瓣電平的關(guān)系。
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關(guān)鍵詞:
- 陣列天線; 互耦; 低副瓣; 容差; 數(shù)字波束形成
Abstract: Generally speaking, an accurate mutual coupling correlation is necessaryfor an array antenna to reach ultra-low sidelobe level. If the mutual impedance or mutual coefficient matrix of an array is perfectly known, one can completely compensate the effect of mutual coupling and realize the desired low sidelobe level in theory. However, the mutual impedance matrix obtained whether by calculation 01 by measurement has a limited precision, which limits the availability of the compensation. This paper deals with the requirements on the precision of mutual impedance for compensation. in ultra-low sidelobe array antenna. The relationship between mutual impedance errors and the amplitude and phase errors of channels is derived, by which the relationship between mutual impedance error and the sidelabe level is given. -
J. Ruze, Proc. IEEE, 54(1966)4, 633-640.[2]R. C. Hansen et al.,Microwave Scanning Antennas, Academic Press, (1966), Vol. 11, Chap. 1.[3]J. K. Hsiao, Array Sidelobe, Error Tolerance, Gain and Beamwidth, AD-A 147004, (1984).[4]I. J. Gupta, A. A. Ksienskd, IEEE Trans. on AP, AP-31(1983)5, 785-791.[5]I. M. 奧特加著,張麗君等譯,數(shù)值分析,高等教育出版社,北京,1984年.[6]張林讓,陣列天線的容差分析,西安電子科技大學(xué)碩士論文,西安,1990年.[7]R. A. Gierard, The Effect of Mutual Coupling on the Sidelobe Performance of Chebyshev Arrays, AD-A, 205724, (1989). -
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