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Beam reconfiguration of linear array of parallel dipole antennas through switching with real excitation voltage distribution

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Abstract

In this paper, authors propose a method based on the modified particle swarm optimization (PSO) for beam reconfiguration of linear array of mutually coupled parallel half-wavelength dipole antennas with real excitation voltage amplitude distribution. Two different beam pairs are generated, one pencil/pencil beam pair and another pencil/flat-top beam pair in the horizontal plane. One beam is changed to another through switching while sharing a common amplitude distribution. Two examples are presented, one without ground plane and another in presence of ground plane. Dipoles are connected to its feed network through a switch, so that it can be turned on or off, depending on the switch position. Beam reconfiguration is achieved by suitably turning the array elements on or off using same voltage excitation distribution. Modified PSO is used to compute the excitation voltages as well as the switching configuration for each pattern having a prefixed side lobe level. The current in the driven and parasitic elements is determined via induced EMF method considering the current distribution on each dipole to be sinusoidal. Proposed method efficiently synthesizes dual-beam switching the power pattern from pencil to pencil and pencil to flat-top having same or different side lobe levels using common excitation voltages. It calculates the maximum variation of the active impedance of driven elements and the power losses when the radiation patterns switch from one beam to another. The paper calculates the array directivity as the distances between antenna array and the ground pane varies. Three other state-of-the-art metaheuristics like differential evolution, gravitational search algorithm, artificial bee colony algorithm are also employed for achieving a comparative evaluation.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, National Institute of Technology, Durgapur, India

    Banani Basu & G. K. Mahanti

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  1. Banani Basu
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  2. G. K. Mahanti
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Correspondence to G. K. Mahanti.

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Basu, B., Mahanti, G.K. Beam reconfiguration of linear array of parallel dipole antennas through switching with real excitation voltage distribution. Ann. Telecommun. 67, 285–293 (2012). https://doi.org/10.1007/s12243-011-0273-8

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  • DOI: https://doi.org/10.1007/s12243-011-0273-8

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