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# Jurnal : Antenna Array Side Lobe Reduction by ImplementingNon – Uniform Amplitude urnal Using Tsukamoto FuzzyLogic Controller

## Jurnal : Antenna Array Side Lobe Reduction by ImplementingNon – Uniform Amplitude Using Tsukamoto FuzzyLogic Controller (Jurnal Teknik Informatika)

Abstract
This  paper  deals  with  a  scheme  of  Antenna  array  side  lobe reduction by varying amplitude of each element of the antenna array using the Tsukamoto fuzzy logic controller. Here it has been tried to reduce the Side Lobe Level of the antenna array radiation pattern by changing the amplitude of the antenna array elements. Spacing between the antenna array elements and the corresponding phase - shift is given in the input of the Tsukamoto fuzzy logic controller and corresponding values of amplitude is obtained at the output of the controller. Implementing the newlyobtained values of amplitude to the each element of the antenna array, the new radiation pattern with reduced side lobe level will be obtained. KeywordsSide Lobe Level, Radiation Pattern, Fuzzifier, Defuzzifier, Fuzzy Logic, Fuzzy Logic Controller, Antenna Array, Array Side Lobe Reduction, Rule – Base; Inference Engine

I.IntroductionAntenna array is a set of several antenna elements. It is mainly used  to  generate  radiation  pattern  with  a  high  directivity.  In case  of  practical  use,  it  is  desirable  to  have  the  radiation  in  a certain direction. The task, in general, is to find out the antenna configuration as well as geometrical dimension and excitation distribution [1]. Any practical use of an antenna array, it should ensure  the  minimum  acceptable  radiation  pattern  under  certain constraints. The  aim  is  to  determine  the  physical  layout  of  the antenna array that produces a radiation pattern which is nearest to  the  desired  pattern  [2].  This  process  is,  in  general,  called synthesis. We  can  synthesize  the  antenna  array  by  reducing  its side lobe level or by decreasing its null point etc. There are various methods that can be used for the antenna array side lobe reduction, namely GAs [3-5], Simulated Annealing (SA) [6], Tabu Search [7], Taguchi’s method [8], Memetic Algorithm (MAs) [9], PSO [10], Fuzzy Genetic Algorithm [11], Fitness-Adaptive Differential Algorithm[12],  Fuzzy  PSO Algorithm  [13],  Bacteria  Foraging Optimization Technique [14] etc. In this work we have tried to synthesize the antenna array radiation pattern by implementing non – uniform amplitude using fuzzy logic [15]. For this work we have used the Tsukamoto fuzzy logic controller.