Pourmohammadi, F., Hakkak, M (2007). Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm. , 7(0), 143-148.
F. Pourmohammadi; M Hakkak. "Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm". , 7, 0, 2007, 143-148.
Pourmohammadi, F., Hakkak, M (2007). 'Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm', , 7(0), pp. 143-148.
Pourmohammadi, F., Hakkak, M Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm. , 2007; 7(0): 143-148.

Design of Adaptive Matching Circuit for Intelligent Quadrifilar Helical Antenna Using the Genetic Algorithm

The Modares Journal of Electrical Engineering
Article 10, Volume 7, Issue 0, 2007, Pages 143-148    PDF (338.83 K)
Authors
F. Pourmohammadi; M Hakkak*
Tarbiat Modares University
Abstract
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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