@article{farias_lemes_vieira_heckler_salazar_2018,  title={Dual-Port Dual-Wideband Annular Slot Antenna with Stable Unidirectional Pattern},  volume={17},  ISSN={2179-1074},  url={https://doi.org/10.1590/2179-10742018v17i11144},  DOI={10.1590/2179-10742018v17i11144},  number={1},  journal={Journal of Microwaves, Optoelectronics and Electromagnetic Applications},  publisher={Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo},  author={Farias, R. L. and Lemes, D. L. and Vieira, J. M. and Heckler, M. V. T. and Salazar, A. F. T.},  year={2018},  month={Mar},  pages={156–170} }