Volume 7 -                   MJEE 2007, 7 - : 143-148 | Back to browse issues page

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Pourmohammadi F, Hakkak M. Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm. MJEE 2007; 7 :143-148
URL: http://mjee.modares.ac.ir/article-17-11193-en.html
Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm
F. Pourmohammadi1 , M Hakkak 1
1- Tarbiat Modares University
Abstract:   (3753 Views)
In some mobile systems, intelligent antennas are used to increase efficiency in a wide frequency band and different environmental and electromagnetic conditions. Environmental factors, such as position of nearby objects, antenna mobility and even user type, can vary the antenna input impedance appreciably. Therefore, it is necessary to incorporate an adaptive impedance matching circuit between the antenna array elements and the transceiver to maximize the antenna radiation power. In this research note, the design of adaptive matching circuit for intelligent quadrifilar helical antenna in the UHF band (for GSM) is presented. The GA algorithm is used to optimize the results. The designed circuit can decrease the VSWR from 20 to less than 2 at any frequency within the GSM bandwidth.
Keywords: Genetic algorithm, Intelligent QHA, Adaptive Matching circuit
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Received: 2005/02/19 | Accepted: 2007/08/23 | Published: 2008/02/20
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