ARLA/CLUSTER: Antenas em metamateriais*.
João Gonçalves Costa
Segunda-Feira, 31 de Agosto de 2009 - 12:03:21 WEST
'Invisibility cloak' antennas
The materials used to make real-life invisibility cloaks could also make antennas smaller.
New Scientist reports that "an international team of physicists has now created metamaterials that can be tuned to a range of different frequencies as required. A cellphone antenna fashioned from the new material could be tuned to work very efficiently across a small frequency range, but retuned to a different band for roaming."
"Because metamaterials can manipulate electromagnetic waves to a greater degree than normal materials - and even bend light "backwards" - a small metamaterial antenna is as effective as a much larger standard antenna at transmitting or receiving waves."
"But a narrowband metamaterial antenna has its drawbacks - it's rare that engineers require an antenna tuned to just one frequency, for instance, different countries have allocated different frequency bands to their cellphone networks. A tunable metamaterial antenna could allow a wireless gadget to work "outstandingly well" at the frequencies used in one country, but also carry the option of retuning for use abroad."
Read the New Scientist article - 'Invisibility cloak' antennas could shrink cellphones - at
Active invisibility cloaks could work at many wavelengths
*Um Metamaterial é um material produzido artificialmente e que é dotado de propriedades que não existem na natureza.
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