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International Journal of Antennas and Propagation
Volume 2012, Article ID 681431, 5 pages
Research Article

Series-Fed Microstrip Array Antenna with Circular Polarization

Department of Computer and Communication Engineering, Chienkuo Technology University, Chang-Hua City 500, Taiwan

Received 21 July 2011; Revised 3 November 2011; Accepted 5 November 2011

Academic Editor: Miguel Ferrando

Copyright © 2012 Tuan-Yung Han. 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.


This study proposes a novel 2 × 2 array antenna design with broadband and circularly-polarized (CP) operation. The proposed design uses a simple series-fed network to increase the CP bandwidth without requiring one-by-one adjustment of each array element or a complex feed network. Selecting the appropriate spacing between each array element allows the proposed array antenna to generate CP radiation with a low axial ratio. Experimental results based on a prototype show that this 2 × 2 microstrip array antenna achieves a wide 3 dB axial ratio bandwidth of more than 10%. Simulated data are also provided to confirm the measured results.