Foam-packed copper grid broadcasts focused radiation for telecommunications.
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References
Enoch, S., Tayeb, G., Sabouroux, P., Guérin, N. & Vincent, P. A metamaterial for directive emission. Physical Review Letters, 89, 213902, (2002).
Temelkuran, B. et al. Photonic crystal-based resonant antenna with a very high directivity. Journal of Applied Physics, 87, 603 - 605, (2000).
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Metamaterial bends microwaves into beam. Nature (2002). https://doi.org/10.1038/news021118-13
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DOI: https://doi.org/10.1038/news021118-13