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The paper presents a new approach regarding the design of non-uniform linear antenna arrays with symmetrical elements, using multi-criteria optimization with genetic algorithms. The goal is to optimize the radiation pattern to bring it closer to the desired one, using non-uniform distances between elements and a non-uniform distribution of currents through the elements, for better efficiency. The...
In this paper, an evolutionary optimization technique, Improved Particle Swarm Optimization (IPSO) is adopted for the complex synthesis of three-ring Concentric Circular Antenna Arrays (CCAA) with non-isotropic elements and without and with central element feeding. It is shown that by selection of a fitness function which controls more than one parameter of the array pattern, and also by proper setting...
In this paper, optimal designs of three-ring Concentric Circular Antenna Arrays (CCAA) without and with central element feeding are reported. For each optimal design, optimal current excitation weights and optimal radii are determined having the objective of maximum Sidelobe Level (SLL) reduction. The optimization technique adopted is Bacteria Foraging Optimization (BFO). The extensive computational...
Circular antenna array has gained immense popularity in the field of communications nowadays. It has proved to be a better alternative over other types of antenna array configuration due to its all-azimuth scan capability, and a beam pattern which can be kept invariant. This paper is basically concerned with the thinning of a large multiple concentric circular array antennas of uniformly excited isotropic...
In many applications it is desirable to have the maximum radiation of an array directed normal to the axis of the array (Broadside radiation). In this paper, the optimal broadside radiation patterns of three-ring Concentric Circular Antenna Arrays (CCAA) with and without central element feeding are reported. For each optimal synthesis, optimal current excitation weights and optimal radii of the rings...
Circular antenna array has gained immense popularity in the field of communications. It has been proved to be a better alternative over other types of antenna array configurations due to its all-azimuth scan capability, and a beam pattern which can be kept invariant. This paper is basically concerned with the thinning of a large multiple concentric circular ring arrays of uniformly excited isotropic...
This paper explains the synthesis technique of symmetric linear array geometry with minimum sidelobes and null control using the cuckoo search (CS) algorithm. The CS is a new nature-inspired evolutionary algorithm capable of solving general N-dimensional, linear and nonlinear optimization problems. The newly evolved CS metaheuristic algorithm is easy to understand and to use, which requires simple...
In this paper, an evolutionary optimization technique Craziness based Particle Swarm Optimization (CRPSO) is adopted for the complex synthesis of three-ring Concentric Circular Antenna Arrays (CCAA) with non-isotropic elements and without and with central element feeding. It is shown that by selection of a fitness function which controls more than one parameter of the array pattern, and also by proper...
In this paper the synthesis of linear array geometry with minimum side lobe level using a new class of Particle Swarm Optimization technique namely Improved Particle Swarm Optimization (IPSO) is described. The IPSO algorithm is a newly proposed, high-performance evolutionary algorithm capable of solving general N-dimensional, linear and nonlinear optimization problems. Compared to other evolutionary...
In many applications it is desirable to have the maximum radiation of an array directed normal to the axis of the array. In this paper, the broadside radiation patterns of three-ring Concentric Circular Antenna Arrays (CCAA) with central element feeding are reported. For each optimal synthesis, optimal current excitation weights and optimal radii of the rings are determined having the objective of...
In many applications it is desirable to have the maximum radiation of an array directed normal to the axis of the array. In this paper, the broadside radiation patterns of three-ring Concentric Circular Antenna Arrays (CCAA) with central element feeding are reported. For each optimal synthesis, optimal current excitation weights and optimal radii of the rings are determined having the objective of...
In this paper synthesis of symmetric linear antenna arrays is described using Genetic Algorithm (GA). Genetic Algorithm has many advantages over other conventional optimization techniques. Real coded GA (RGA) is a high performance evolutionary optimization algorithm. It is used in this paper to find optimum inter-element spacing and excitation coefficients for the symmetric linear antenna array in...
In this paper, optimal designs of three-ring concentric circular antenna arrays (CCAA) without and with central element feeding are reported. For each optimal design, optimal current excitation weights and optimal radii are determined having the objective of maximum Sidelobe Level (SLL) reduction. The optimization technique adopted is Particle swarm optimization with constriction factor and inertia...
In this paper the synthesis of linear array geometry with minimum sidelobe level using a new class of Particle Swarm Optimization technique namely Novel Particle Swarm Optimization (NPSO) is described. The NPSO algorithm is a newly proposed, high-performance evolutionary algorithm capable of solving general N-dimensional, linear and nonlinear optimization problems. Compared to other evolutionary methods...
A new approach for the synthesis of thinned linear array with minimum sidelobe level is introduced. The method is a genetic algorithm based on orthogonal design. The orthogonal design with the factor analysis, an experimental design method, is applied to the genetic algorithm, to make the algorithm be more robust, statistically sound and quickly convergent. In order to evaluate the performance of...
In this paper the maximum sidelobe level (SLL) reductions without and with central element feeding in various designs of three-ring concentric circular antenna arrays (CCAA) are examined using a novel particle swarm optimization algorithm (NPSO) to finally determine the global optimal CCAA design. Real coded Genetic Algorithm (RGA) is also employed for comparative optimization but it proves to be...
An improved pattern synthesis algorithm based on optimization theory is proposed. The non-convex problem of array pattern synthesis with a dynamic range constraint in amplitude is converted to two convex formulations for optimization, and the amplitude of the optimal weight is confined to a certain dynamic range. The proposed method provides the optimal tradeoff among the mainlobe pattern, the sidelobe...
In this paper, the synthesis of subarrayed antennas with subarrays having different weights and dimensions is considered. The problem is formulated as the definition of the element clustering into spatially contiguous subarrays and the corresponding weights to obtain a pattern with the lowest (i.e., minimum achievable) sidelobe level (SLL). The problem is addressed with an unconstrained approach based...
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