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The process of thinned antenna array synthesis involves the simultaneous minimization of a number of mutually conflicting parameters, such as peak sidelobe level and first null beam width. This necessitates the development of a multi objective optimization approach which will provide the best compromised solution based on the application at hand. In this paper multi-objective optimization is achieved...
Radiating cable (leaky feeder) is an attractive transceiver for short range broadband wireless access envisioned in mm-wave bands. A leaky feeder having slot antennas along its axis is a natural beam forming transceiver that eliminates the need for separate multiple antennas. However, the traditional radiating cable has equally spaced slots that give higher sidelobe energy. In this paper, slot spacing...
Yagi antennas are preferred in UHF applications. Commonly used Yagi antennas are made with simple dipole elements or they use simple circular or rectangular loop as individual elements. This paper presents optimum design of adage type antenna using twin polygonal loop structure. The antenna is optimised for maximum directive gain subject to minimum voltage standing wave ratio (VSWR). The optimizations...
This paper describes optimal thinning of Concentric Hexagonal Array (CHA) of uniformly excited isotropic antennas which can generate directive beam with minimum relative Side Lobe Level (SLL). The Craziness Based Particle Swarm Optimization (CRPSO) method, which represents a new approach for optimization problems in electromagnetics, is used in the optimization process. The CRPSO is used to determine...
Design of non-uniform circular antenna arrays is one of the important optimization problems in electromagnetic domain. While designing a non-uniform circular array the goal of the designer is to achieve minimum side lobe levels with maximum directivity. In contrast to the single-objective methods that attempt to minimize a weighted sum of the four objectives considered here, in this article we consider...
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 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 presents an optimal design and synthesis of three-ring Concentric Circular Antenna Arrays (CCAA) with non-isotropic elements with and without central element feeding. Novel Particle Swarm Optimization (NPSO) is adopted as an evolutionary optimization technique for the CCAA design and synthesis. It is shown that by proper selection of the fitness function which controls more than one parameter...
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...
Evolutionary algorithms (EAs) have had a widespread diffusion and have demonstrated to be very effective techniques for the design of antenna arrays. However, the main limitations are the high computational burden and low convergence speed which stimulated researchers towards the development of even more effective approaches or the definition of suitable optimization frameworks. Two innovative EA-based...
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...
The design of an optimized planar dipole array (OPDA) antenna is presented using particle swarm optimization (PSO), a well-known global optimization method. The planar dipole array (PDA) elements' lengths and widths and the spacing between them were the optimization parameters, and the antenna input's VSWR and gain were optimization goals. In the optimization procedure, the fitness functions were...
Minimum-redundancy multiple-input multiple-output (MR-MIMO) antenna arrays - a class of thinned arrays - are introduced. The concepts of convolution array and correlation array are used for data processing required for radar applications but also for optimization of the element distribution in such arrays. An upper bound for the achievable thinning rate is estimated. Particle swarm optimization (PSO)...
The design of a beam-forming network (BFN) for multibeam-steerable antenna array using Coherently Radiating Periodic Structures (CORPS) in cellular mobile communication systems is presented. In this work, CORPS technology as a BFN is introduced in cellular systems. The CORPS-BFN proposed improves the performance over commonly used feeding networks used on mobile systems. The feeding ports of the network...
This paper presents and compares different configurations of several heuristic optimization methods with the aim of seeking the one with the best performance when applied to phase synthesis of reflectarray antennas. This phase synthesis is a hard task and improving the synthesis method can result in significant reductions in the associated computational cost. The performance of algorithms such as...
Concentric Circular Antenna Array (CCAA) has several interesting features that makes it indispensable in mobile and communication applications. Here we have considered a uniform arrangement of elements where the inter-element spacing is kept half a wavelength. The main aim is to reduce the sidelobe levels and the primary lobe beamwidth as much as possible. Central to our design is a hybridization...
In recent years, evolutionary optimization (EO) techniques have attracted considerable attention in the design of electromagnetic systems of increasing complexity. This paper describes a method of synthesis of uniform circular array antenna using three recent search heuristics: Modified Particle Swarm Optimization (MPSO), Differential Evolution (DE) and Artificial Bee Colony (ABC) optimization algorithms...
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...
This paper describes a method of synthesis of uniform circular array with optimized spacing using three recent search heuristics: Modified Particle Swarm Optimization (MPSO), Differential Evolution (DE) and Artificial Bees Colony (ABC) algorithms. The objective of the work is to generate a pencil beam with minimum Side Lobe Level (SLL) and maximum possible Directivity for fixed half power beam width...
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