@article {85sy-qbk6,
	title = {Kapitza-inspired stabilization of non-Foster circuits via time modulations},
	journal = {Phys. Rev. Appl.},
	volume = {24},
	year = {2025},
	month = {Aug},
	pages = {024022},
	publisher = {American Physical Society},
	doi = {10.1103/85sy-qbk6},
	url = {https://link.aps.org/doi/10.1103/85sy-qbk6},
	author = {Alex-Amor, Antonio and Ptitcyn, Grigorii and Engheta, Nader}
}
@conference {20_EUCAP2020_LENTE_BOULDER_EDUARDO,
	title = {Ka-band Multi-beam Planar Lens Antenna for 5G Applications},
	booktitle = {2020 14th European Conference on Antennas and Propagation (EuCAP)},
	year = {2020},
	month = {March},
	pages = {1-5},
	abstract = {A low-cost solution for multi-beam antenna systems is explored for 5G applications in the 26-GHz band. A 4-port stacked-patch microstrip antenna is used as feeder of a perforated flat lens. Each feeder is placed in a different position with respect to the lens, yielding four high-directivity independent beams. The beams cover an angular range from broadside to a 30-degree steering with a gain over 18 dB. The antenna has been implemented by low-cost processes, employing Printed Circuit Board fabrication for the feeder and 3D printing for the lens.},
	keywords = {5G mobile communication, Beam steering, Microstrip antennas},
	doi = {10.23919/EuCAP48036.2020.9135364},
	author = {E Garcia-Marin and D S Filipovic and J L Masa-Campos and P Sanchez-Olivares}
}
