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International Journal of Antennas and Propagation
Volume 2017, Article ID 4983724, 12 pages
Research Article

Topological Design of Planar Circularly Polarized Directional Antenna with Low Profile Using Particle Swarm Optimization

1Department of Electronics Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2China Ship Development and Design Center, Wuhan, China

Correspondence should be addressed to Xiaonan Zhao; moc.liamtoh@nxz_kcolrehs

Received 29 January 2017; Accepted 11 April 2017; Published 17 May 2017

Academic Editor: Davide Ramaccia

Copyright © 2017 Xiaonan Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A topological method for the design and optimization of planar circularly polarized (CP) directional antenna with low profile was presented. By inserting two parasitic layers, generated by particle swarm optimization, between the equiangular spiral antenna and the ground, a low-profile wideband CP antenna with directional radiation pattern and high gain is achieved. The optimized antenna shows an impedance matching band () of 4–12 GHz with a whole-band stable directional pattern in 4–11.5 GHz, and the antenna gain peak is 8 dBi, which work well in the available band. Measured return loss, antenna gain, and far field patterns agree well with simulation results.