Optimization of Large Log-Periodic Dual-Dipole Antenna by Using Genetic Algorithm on Embedded Element in Small Log-Periodic Array

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 4Language: englishTyp: PDF

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Yang, Jian; Kildal, Per-Simon (Dept of Signals and Systems, Chalmers University of Technology, 41296 Gothenburg, Sweden)

The paper introduces a new method that can predict the reflection coefficient of a complete large log-periodic array (with large number of elements) by calculating the embedded S-parameters between all input and output ports of similar elements that are embedded in a much smaller log-periodic array. By this method we can apply global optimization scheme such as Genetic Algorithm on embedded element in the smaller log-periodic array to improve the reflection coefficient of the larger log-periodic array very efficiently. As an example, an Eleven feed for 2 – 13 GHz has been optimized by using Genetic Algorithm with the present method. The result is a reflection coefficient below -10 dB from 2 GHz to 13 GHz.