论文信息 - PERFORMANCE IMPROVEMENT IN AMPLITUDE SYNTHESIS OF UNEQUALLY SPACED ARRAY USING LEAST MEAN SQUARE METHOD

PERFORMANCE IMPROVEMENT IN AMPLITUDE SYNTHESIS OF UNEQUALLY SPACED ARRAY USING LEAST MEAN SQUARE METHOD

In this paper, an efficient method to obtain the elements current distribution for a non uniformly spaced array is presented. For a given far field pattern, after sampling the array factor the proposed method uses the least mean square error technique to solve the system ofequations rather than solving the previously published Legendre function method. It's shown that the average side lob level obtained by this proposed method is some 5 dB lower in comparison with the existing Legendre function method ofsolution. Ifthe Legendre function method published in the literature is to be used to solve for the current distribution, in the final part ofthis paper, a criteria on how to choose suitable vectors that would result in a 3 dB lower side lobe level performance will be provided.

[1] R. J. Mailloux,et al. Statistically thinned arrays with quantized element weights , 1991 .

[2] G. N. Watson,et al. Linear Arrays with Arbitrarily Distributed Elements , 1956 .

[3] G. Nemhauser,et al. Dynamic programming applied to unequally spaced arrays , 1964 .

[4] M. A. Ingram,et al. Pattern Synthesis for Arbitrary Arrays Using an Adaptive Array Method , 1999 .

[5] Moctar Mouhamadou,et al. SMART ANTENNA ARRAY PATTERNS SYNTHESIS: NULL STEERING AND MULTI-USER BEAMFORMING BY PHASE CONTROL , 2006 .

[6] Randy L. Haupt,et al. Thinned arrays using genetic algorithms , 1993, Proceedings of IEEE Antennas and Propagation Society International Symposium.

[7] G. K. Mahanti,et al. SYNTHESIS OF THINNED LINEAR ANTENNA ARRAYS WITH FIXED SIDELOBE LEVEL USING REAL-CODED GENETIC ALGORITHM , 2007 .

[8] B. P. Kumar,et al. Design of unequally spaced arrays for performance improvement , 1999 .

[9] Roger F. Harrington,et al. Sidelobe reduction by nonuniform element spacing , 1961 .

[10] A. Ishimaru. Theory of unequally-spaced arrays , 1962 .

[11] K. Guney,et al. Amplitude-Only Pattern Nulling of Linear Antenna Arrays with the Use of Bees Algorithm , 2007 .

[12] R.T. Compton,et al. A numerical pattern synthesis algorithm for arrays , 1990, International Symposium on Antennas and Propagation Society, Merging Technologies for the 90's.