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www.southgatearc.org
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'Invisibility cloak' antennasThe 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
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