@INPROCEEDINGS {16180,
author={T. Varum and J. M.  Matos and P. Pinho and V. C. Duarte },
doi={10.1109/APS.2015.7305321},
booktitle={IEEE AP-S/URSI International Symp.},
title={Circularly polarized microstrip antenna array for the Ka-band},
year={2015},
month={July},
volume={1},
pages={1864-1865} 
}