Time and frequency domain simulation, measurement and optimization of log-periodic antennas

Keyur Mistry, Pavlos Lazaridis, Zaharias Zaharis, Mobayode Akinsolu, Bo Liu, Thomas D. Xenos, Ian Glover, Ramjee Prasad

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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 realized gain is in good agreement with the simulated realized gain. The antenna is then optimized to concurrently improve voltage standing wave ratio, realized 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. The Trusted Region Framework algorithm seems to have the best performance in adequately optimizing all predefined goals specified for the antenna.

Original languageEnglish
Pages (from-to)771-783
Number of pages13
JournalWireless Personal Communications
Issue number2
Early online date5 Apr 2019
Publication statusPublished - 1 Jul 2019


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