@INPROCEEDINGS {2171,
author={T Gandara and C. Peixeiro},
doi={},
booktitle={IEEE AP-S/URSI International Symp.},
title={Compact Double U-Slotted Microstrip Patch Antenna Element for GSM1800, UMTS and HiperLAN2},
year={2004},
month={June},
volume={2},
pages={1459-1462} 
}