طراحي مدار تطبيق وفقي آنتن مارپيچي چهار سيم با استفاده از الگوريتم ژنتيك

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

In somemobile systems, intelligent antennas are usedto 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 elementsand 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 VSWRfrom 20 to less than 2 at any frequency within the GSM bandwidth.