Abstract

In this paper, a new modified method is presented for the synthesis of a linear antenna array to obtain a desired array pattern (shaped or pencil) with low side lobe level. Based on the original invasive weeds optimization (IWO), our modified IWO (MIWO) uses the process of mutation for the calculation of standard deviation. The shaped beam pattern is synthesized by respecting a desired cosecant pattern and supressing side lobe level to -25 dB. To achieve the desired pattern, both amplitude and phase of each element in the array are optimized when the spacing between the elements is fixed to the half wavelength. For the desired pencil beam pattern, the inter-element spacing’s are controlled while maintaining uniform excitations. Selected examples, for both shaped and pencil beam, are presented to show the effectiveness and flexibility of the proposed method. DOI: http://dx.doi.org/10.5755/j01.eee.21.5.13332

Highlights

  • The recent developments in wireless telecommunications technologies require networks with enhanced characteristics like capacity and coverage

  • In order to assess the performance of the proposed modified IWO (MIWO) for the synthesis of linear arrays, two examples have been chosen and presented

  • A comparison is presented between the proposed method and other instantiations in the literature such as artificial bees colony (ABC) [12], particle swarm optimization (PSO) [9] and ant colony optimization (ACO) [8]

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Summary

INTRODUCTION

The recent developments in wireless telecommunications technologies require networks with enhanced characteristics like capacity and coverage. The synthesis of antenna array that gives a desired pattern by controlling amplitude and phase is a nonlinear problem. A new modified version of IWO, known as MIWO, is presented for the synthesis of linear array antenna to obtain an array pattern with shaped beam. If the generated number is greater than Pm, the algorithm will replace the value of the calculated standard deviation SD of the current iteration by its initial value. This process of mutation allows a larger dispersion of seeds around the parent plant, avoiding getting stuck in local minima. To illustrate the performance of the proposed algorithm, MIWO is applied to synthesis of both pencil beam patterns and shaped beam patterns

ANTENNA ARRAY PROBLEM FORMULATION
MODIFIED INVASIVE WEEDS OPTIMIZATION
Initialization
Reproduction
Mutation
Limitation
NUMERICAL RESULTS
COMPARATIVE STUDY
CONCLUSIONS

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