CST – Computer Simulation Technology

Optimization of Reflection Coefficient of Large Log-Periodic Array by Computing only a Small Part of It
Jian Yang, Per-Simon Kildal
IEEE Transactions on Antennas and Propagation
Volume: 59, Issue: 6, June 2011
1790 - 1797
Antenna feed, Eleven antenna, log-periodic array antenna, optimization, genetic algorithm
A new method is described in the paper to predict the reflection coefficient of a complete large log-periodic array (with large number of elements) from the computed performance of a small part of the array. The small part is referred to as the partial array. The method involves computing the embedded Sparameters between all the elements of this partial array and then using these S-parameters to predict the performance of the full array. As an example, the method has been applied to optimize the Eleven antenna for 2 - 13 GHz. The result of the optimization is that the reflection coefficient is improved significantly to be below -10 dB over the whole frequency band. The results have been verified by measurements.

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