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International Journal of Antennas and Propagation
Volume 2014, Article ID 765891, 8 pages
Research Article

Suppression of Cross-Polarization of the Microstrip Integrated Balun-Fed Printed Dipole Antenna

College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Received 25 December 2013; Accepted 24 February 2014; Published 1 April 2014

Academic Editor: Xiuping Li

Copyright © 2014 Huang Jingjian 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.


The high cross-polarization of the microstrip integrated balun-fed printed dipole antenna cannot meet the demands of many engineering applications. This kind of antennas has high cross-polarization levels (about −20 dB). And we find that the high cross-polarization radiation is mainly produced by the microstrip integrated balun rather than the dipole itself. The very limited method to lower the cross-polarization level of this kind of antennas is to reduce the substrate thickness. In this paper, to improve the low cross-polarized performance, firstly, an equivalent model is presented to analyze the cross-polarization radiation. Secondly, a novel structure with low cross-polarization is proposed. The microstrip integrated balun is enclosed by a center slotted cavity. The E-field of the microstrip integrated balun is transformed parallel to the dipole arms by the slot, so the radiation of the cross-polarized component is suppressed. Measured results show that this structure can achieve a bandwidth wider than 40% while reducing the cross-polarization level to less than −35 dB within the frequency band.