@INPROCEEDINGS {11906,
author={N. Pires and C. Mendes and M.  Koohestani and A. Skrivervik and A. A. Moreira},
doi={},
booktitle={IEEE AP-S/URSI International Symp.},
title={Radiation Efficiency of a Coplanar-fed Ultra-Wideband Antenna},
year={2012},
month={July},
volume={1},
pages={1-2} 
}