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.
|Title of host publication||Proceedings of the 32nd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), (Montreal, 19-26 August 2017)|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|Publication status||Published - 13 Nov 2017|
|Event||XXXIInd International Union of Radio Science General Assembly & Scientific Symposium - Montreal Convention Center, Montreal, United Kingdom|
Duration: 19 Aug 2017 → 26 Aug 2017
Conference number: 32
http://www.ursi2017.org/welcome_e.shtml (Link to Symposium Website)
|Conference||XXXIInd International Union of Radio Science General Assembly & Scientific Symposium|
|Abbreviated title||URSI GASS 2017|
|Period||19/08/17 → 26/08/17|
Mistry, K., Lazaridis, P., Glover, I., Holmes, V., Khan, F., Ahmed, Q., ... Xenos, T. D. (2017). Measurement, Simulation and Optimization of Wideband Log-Periodic Antennas. In Proceedings of the 32nd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), (Montreal, 19-26 August 2017) Institute of Electrical and Electronics Engineers Inc..