Table of Contents
International Journal of Microwave Science and Technology
Volume 2014, Article ID 712735, 5 pages
Research Article

A Simple Method to Stabilize Radiation Pattern over a Large Bandwidth

L'UNAM Université, Université de Nantes, IETR UMR 6164, Polytech Nantes, La Chantrerie, rue C. Pauc, 44306 Nantes Cedex 03, France

Received 23 January 2014; Revised 8 April 2014; Accepted 14 April 2014; Published 14 May 2014

Academic Editor: Ramon Gonzalo

Copyright © 2014 Haiyang Zhang 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.


An alternative radiation stabilization method has been presented for patch antenna. With this method, side radiation could be suppressed when a conductor ring and a circular slot both with the width of a quarter-wavelength are placed on the same layer and around patch antenna. An experimental structure has been simulated and the distance from antenna part to conductor ring is optimized using parametric function of HFSS software. Measured results given in this paper obviously indicate that not only the side radiation from the boundary of substrate could be suppressed effectively, but also the antenna directivity could be adjusted and enhanced after this method has been carried out. Both simulation and measurement indicate that when the distance is set to one guided wavelength ( ), side radiation could be suppressed the most effectively and the return loss of patch antenna is only slightly affected.