Synthesis of Thinned Planar Circular Array Antennas Using Modified Particle Swarm Optimization

Abstract

In this paper, the authors present an optimization method based on modified Particle Swarm Optimization (PSO) algorithm for thinning large multiple concentric circular ring arrays of uniformly excited isotropic antennas that will generate a pencil beam in the vertical plane with minimum relative side lobe level (SLL). Two different cases have been studied, one with fixed uniform inter-element spacing and another with optimum uniform inter-element spacing. In both the cases, the number of switched off elements is made equal to 220 or more. The half-power beam width of the synthesized pattern is attempted to make equal to that of a fully populated array with uniform spacing of 0.5λ. Simulation results of the proposed thinned arrays are compared with a fully populated array to illustrate the effectiveness of our proposed method.

Pattern Synthesis of Concentric Circular Antenna Array by Nonlinear Least-Square Method

“…A concentric circular array has the advantage of being compact and provides a rotation of main beam by the shift of the array element excitations [20,21]. However, if the number of array elements is large, global optimization methods will take a great deal of time to get a satisfied result.…”

“…An array element is disposed at the origin point and the other elements are disposed on some concentric circular rings. Assuming that all elements are isotropic sources, then the antenna factor of the considered geometry is reported in the following relation [21] …”

Design of a Fully Digital Controlled Reconfigurable Switched Beam Concentric Ring Array Antenna Using Firefly and Particle Swarm Optimization Algorithm

“…In this paper, we proposed a technique to generate dual radiation patterns from a concentric ring array [12][13][14][15][16][17][18][19][20][21][22][23][24] with desired design specifications, based on finding the two optimum combinations of the states of the switches, which are assumed to be connected with the rings of the array, along with an optimum set of 4-bit radial amplitude and 5-bit radial phase distributions of the array elements. The proposed method has been applied to generate two different beam pair: a pencil/pencil beam-pair and a pencil/flat-top beam-pair in the vertical plane with specified values of side lobe level (SLL), first null beamwidth (FNBW), half-power beamwidth (HPBW) and ripple.…”

Combination of Inverse Fast Fourier Transform and Modified Particle Swarm Optimization for Synthesis of Thinned Mutually Coupled Linear Array of Parallel Half-Wave Length Dipole Antennas

“…Due to the complexity in synthesis problem, analytical methods are not generally used in designing a thinned array. Therefore, evolutionary optimization tools such as Ant colony optimization [2], Genetic Algorithms [3,4], Particle Swarm Optimization [5], Pattern search algorithm [6] etc.. are used to thin an array. Deterministic approach [7] has been applied for thinning a planar array.…”