@INPROCEEDINGS {15227,
author={R. Gomes and P. Paraíso and T.  Fernandes and R. F. S. Caldeirinha},
doi={0},
booktitle={Loughborough Antennas and Propagation Conf. – LAPC},
title={Passive Phase Conjugating Array Using FR4},
year={2014},
month={November},
volume={1},
pages={1-4} 
}