OPTIMIZATION OF SIDE LOBE LEVEL AND FIXING QUASI-NULLS IN BOTH OF THE SUM AND DIFFERENCE PATTERNS BY USING CONTINUOUS ANT COLONY OPTIMIZATION (ACO) METHOD

In this paper, the optimization of both sum and difference patterns of linear monopulse antennas with low side lobe levels, high directivity and also narrow main beam width are efficiently solved by Continuous Ant Colony Optimization (ACO) Method. The synthesis problem is optimized by defining a suitable cost function which is based on limitation of the side lobe level. In this work, three different parameters are considered to be optimized separately which are the excitation amplitude of each element, the excitation phase of each element and finally the element-to-element spacing. Numerical results of each step, sum and difference patterns, are illustrated in each related part. Finally, we investigate placing some nulls in specific directions to suppress the jamming signals in both sum and difference patterns.

[1]  Luca Maria Gambardella,et al.  Ant Algorithms for Discrete Optimization , 1999, Artificial Life.

[2]  Yong-Chang Jiao,et al.  Synthesis of Circular Antenna Array Using Crossed Particle Swarm Optimization Algorithm , 2006 .

[3]  Yilong Lu,et al.  Sidelobe reduction in array-pattern synthesis using genetic algorithm , 1997 .

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

[5]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[6]  A. Mallahzadeh,et al.  Application of the Invasive Weed Optimization Technique for Antenna Configurations , 2008 .

[7]  E. Soliman,et al.  Optimization and Characterization of Electromagnetically Coupled Patch Antennas using RBF Neural Networks , 2006 .

[8]  E. Moreno,et al.  Optimal compromise among sum and difference patterns through sub-arraying , 1996, IEEE Antennas and Propagation Society International Symposium. 1996 Digest.

[9]  J.-Y. Li,et al.  Optimization of Broadband Top-Load Antenna Using Micro-Genetic Algorithm , 2006 .

[10]  C. Christodoulou,et al.  Linear array geometry synthesis with minimum sidelobe level and null control using particle swarm optimization , 2005, IEEE Transactions on Antennas and Propagation.

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

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

[13]  K.W.E. Cheng,et al.  An improved ant colony optimization algorithm and its application to electromagnetic devices designs , 2005, IEEE Transactions on Magnetics.

[14]  Krzysztof Socha,et al.  ACO for Continuous and Mixed-Variable Optimization , 2004, ANTS Workshop.

[15]  J. A. Rodriguez,et al.  Optimal Compromise Between Sum and Difference Patterns While Fixing Quasi-Nulls in Both , 1999 .

[16]  E.J. Rothwell,et al.  Investigation of Simulated annealing, ant-colony optimization, and genetic algorithms for self-structuring antennas , 2004, IEEE Transactions on Antennas and Propagation.

[17]  E. Rajo-Iglesias,et al.  Ant Colony Optimization in Thinned Array Synthesis With Minimum Sidelobe Level , 2006, IEEE Antennas and Wireless Propagation Letters.

[18]  S. Demir.  Matching circuit design using ant colony optimization method [transmission line impedance matching] , 2003, IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450).

[19]  Randy L. Haupt.  Simultaneous nulling in the sum and difference patterns of a monopulse antenna , 1984 .

[20]  Yong-Chang Jiao,et al.  Crossed Particle Swarm Optimization Algorithm , 2006, ICNC.

[21]  A. Akdagli,et al.  Clonal Selection Algorithm for Design of Reconfigurable Antenna Array with Discrete Phase Shifters , 2007 .

[22]  Vittorio Murino,et al.  Synthesis of unequally spaced arrays by simulated annealing , 1996, IEEE Trans. Signal Process..

[23]  Thomas Stützle,et al.  Ant Colony Optimization , 2009, EMO.

[24]  A. Massa,et al.  Optimization of the difference patterns for monopulse antennas by a hybrid real/integer-coded differential evolution method , 2005, IEEE Transactions on Antennas and Propagation.