International Journal of Electrical and Computer Engineering (IJECE) Vol. 6, No. 3, June 2016, pp. 1077 ~ 1085 ISSN: 2088-8708, DOI: 10.11591/ijece.v6i3.9193  1077 Journal homepage: http://iaesjournal.com/online/index.php/IJECE Synthesis and Implementation (In STM8S) of Phased Circular Antenna Arrays Using Taguchi Method N. Nemri, H. W. Badri, R. Ghayoula, H. Trabelsi, A. Gharsallah Unit of Research in High Frequency Electronic Circuits and Systems, Tunis El Manar University, Tunisia Article Info ABSTRACT Article history: Received Oct 13, 2015 Revised Jan 1, 2016 Accepted Jan 16, 2016 This paper is aimed at assessing the effectiveness of the phase-only control strategy based on a customized Taguchi method when applied to Uniform Circular Arrays (UCA). The objective of this paper consists to contribute the main lobe optimization of the smart antenna using Taguchi's method. We used the cited method in order to determine phase's weights for each element of the circular antenna array in order to steer the principal lobe from -65° to 65° covering all angular space. After that, we made an electronic platform using the microcontroller STM8S in order to implement an intelligent system. The architecture of this work had used a digital phase shifters, a demodulator AD8347, a modulator AD8349, an array antenna, cards STM8S-Discovery. Keyword: Circular antenna array Optimisation Radiation Smart antenna Taguchi’s Method Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: Nadhem Nemri, Unit of Research in High Frequency Electronic Circuits and Systems, Tunis El Manar University, Tunisia Email: nadhem.nemri@gmail.com 1. INTRODUCTION In the last few years, in some countries the number of subscribers to wireless services has boosted greatly. Actually, more than 60% of the population are enjoying it with no sign of saturation. Providing everyone, everywhere at anytime with mobile communication service at low cost with high quality and high data rates but with low emission of radiation and so forth has become à preoccupation. This leads to challenges for the system designer as these objectives are counteracting. Over the last decade, smart antenna systems are required in the communications industry due to their adaptive features. Smart antennas can be categorized into two main techniques; switched beam array and phased array antennas. In a switched beam array, the direction of the beam is chosen from a set of predetermined beams while in a phased array, the main beam is steered towards a specific direction. Circular antenna arrays have been developed and presented for a variety of applications: in mobile and commercial satellite communications systems, sonar and radar. It consists of a number of elements arranged on a circle [1] with uniform spacing and can be used for beam forming in the azimuth plane for example at the base stations of the mobile radio communications system [2]. They are very useful in high power transmission, reduced power consumption and enhanced spectral efficiency. To provide a very directive pattern, it is necessary that the fields from the array elements must add constructively in some desired direction and add destructively and cancel each other in the remaining space. This is important to reduce interference from side lobe of the antenna [3]. Among the different type of antenna arrays, recently, circular arrays have become the most popular in mobile and wireless communications. In this paper we propose the use of the Taguchi Method to determine an optimum weights and implement it’s in an electronic platform using the microcontroller STM8S.