INVISIBLE ENCLOSURE
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United States of America Patent
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Issued Date -
Jan 17, 2013
app pub date -
Mar 24, 2011
filing date -
Mar 26, 2010
priority date (Note) -
Abandoned
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Abstract
An invisible enclosure includes a cylindrical central enclosure having a cavity formed therein and an outer shell formed of homogenous materials, with an object in the cavity and the central enclosure itself being substantially invisible with an electromagnetic wave. The central enclosure is formed by laminating a large number of cylindrical layered films formed by radially laminating a plurality of materials having different permittivities. Effective values of respective permittivities of respective parts of the central enclosure are adjusted by adjusting permittivities and radial thicknesses of respective layers of the layered films along a radius value of the central enclosure. The radial element of a permittivity tensor is set to be a value sequentially increasing along a radius from the innermost circumference of the central enclosure to the outermost circumference thereof and is set to be a predetermined value smaller than the permittivity of the outer shell at the outermost circumference.
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