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Measurement, simulation and optimization of wideband log-periodic antennas

Mistry, Keyur, Lazaridis, Pavlos, Glover, Ian, Holmes, Violeta, Khan, Faheem A., Ahmed, Qasim Z., Zaharis, Zaharias D. and Xenos, Thomas D. (2017) Measurement, simulation and optimization of wideband log-periodic antennas. In: URSI GASS 2017, 19-26 August 2017, Montreal, Canada.

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Log-periodic antenna is a special antenna type utilized with great success in many broadband applications due to its ability to achieve nearly constant gain over a wide frequency range. Such antennas are extensively used in electromagnetic compatibility measurements, spectrum monitoring and TV reception. In this study, a log-periodic dipole array is measured, simulated, and then optimized in the 470-860 MHz frequency band. Two simulations of the antenna are initially performed in time and frequency domain respectively. The comparison between these simulations is presented to ensure accurate modelling of the antenna. The practically measured net gain is in good agreement with the simulated net gain. The antenna is then optimized to concurrently improve voltage standing wave ration, net gain and front-to-back ratio. The optimization process has been implemented by using various algorithms included in CST Microwave Studio, such as Trusted Region Framework, Nelder Mead Simplex algorithm, Classic Powell and Covariance Matrix Adaptation Evolutionary Strategy (CMA-ES). The Trusted Region Framework seems to have the best performance in sufficiently optimizing all predefined goals specified for the antenna.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Boom; CST; Dipoles; Directivity; Electromagnetic compatability; Gain; Log-periodic antenna; LPDA; Measurements; Optimization; Evolutionary algorithms; TV reception; UHF
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Schools: School of Computing and Engineering > Systems Engineering Research Group
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Depositing User: Pavlos Lazaridis
Date Deposited: 15 Sep 2017 10:42
Last Modified: 28 Aug 2021 15:38


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