@article {19_MOTL_BRANDE_ARRAY UWB,
	title = {UWB four elements antenna array},
	journal = {Microwave and Optical Technology Letters},
	volume = {61},
	number = {5},
	year = {2019},
	pages = {1284-1294},
	abstract = {Abstract In this work, a planar UWB four elements antenna array with and without notch filter is designed. The feeding system of the array is an UWB four branch multiple segment power divider/combiner. Each branch has a three segments impedance transformer. Measurements show that the array works well within the band 3.1 to 10.6 with S11 lower than -10 dB. It is shown that the maximum gain varies with the operating frequency having a value of 8 to 12.3 dB and that it is higher than the gain of the single element.},
	keywords = {antenna array, notch filters, ultra-wideband antennas},
	doi = {10.1002/mop.31664},
	url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/mop.31664},
	author = {B T Ahmed and J L Masa-Campos and D Brande-Hern{\'a}ndez}
}
