Isotropic metamaterial lens for magnetic imaging applications
First Claim
1. A metamaterial lens having an operating frequency comprising:
- a plurality of dielectric substrates arranged in the form of a plurality of unit cells;
the metamaterial lens having an isotropic magnetic permeability of μ
=−
1 at an operating frequency;
the metamaterial lens including resonators arrayed in three orthogonal planes, each of said resonators on one of said dielectric substrates,each resonator including a conducting ring structure and a surface-mounted reactive component.
1 Assignment
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Accused Products
Abstract
Examples of the present invention include metamaterial lenses that allow enhanced resolution imaging, for example in MRI apparatus. An example metamaterial may be configured to have μ=−1 along three orthogonal axes. Superior performance was demonstrated using such improved designs, and in some examples, imaging resolution better than λ/500 was obtained. The use of one or more lumped reactive elements in a unit cell, such as one or more lumped capacitors and/or one or more lumped inductors, allowed unit cell dimensions and hence resolution to be dramatically enhanced. In some examples, a cubic unit cell was used with an essentially isotropic magnetic permeability of μ=−1 obtained at an operating electromagnetic frequency and wavelength (λ).
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Citations
17 Claims
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1. A metamaterial lens having an operating frequency comprising:
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a plurality of dielectric substrates arranged in the form of a plurality of unit cells; the metamaterial lens having an isotropic magnetic permeability of μ
=−
1 at an operating frequency;the metamaterial lens including resonators arrayed in three orthogonal planes, each of said resonators on one of said dielectric substrates, each resonator including a conducting ring structure and a surface-mounted reactive component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A metamaterial lens having an operating frequency between 1 MHz and 1 GHz, said lens comprising,
a plurality of dielectric substrates arranged in the form of a plurality of unit cells; -
the metamaterial lens having an isotropic magnetic permeability of −
1 at the operating frequency,the each of said dielectric substrates including a resonator, said resonator including a conducting ring structure having a gap therein and a reactive component electrically connected across the gap. - View Dependent Claims (17)
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Specification