Fractal metamaterial cage antennas
AssigneeFractal Antenna Systems, Inc.
InventorsNathan Cohen, Daniel Earle, Justin Mitchell
Life of this patent
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Abstract
Cage antennas and related components are described. Such cage antennas include a shortened antennal element, such as a monopole (e.g., of approximately ⅛-wave height of a desired operational wavelength), which can be placed on a shortened ground plane (e.g., roughly quarter-wave size). A cage-like ensemble (e.g., a cage) can then be placed on top of but not touching the antenna element. The cage structure can have a fractal-based, folded, and/or pleated structure, among others. This cage structure can be produced either through a variety of means including but not limited to 3-D printing with either conductive materials or inductively coded materials.
Claims9
A cage antenna comprising:
- an antenna element configured as a monopole and having an apex and configured to receive RF energy;
- a ground plane;
- and
- a cage connected to the ground plane, wherein the cage includes a plurality of arms having first and second ends, wherein each arm is connected at the first end to a different location on the ground plane and is connected at the second end to a respective second end of one or more of the other arms at a location directly above the apex of the antenna element, relative to the ground plane, wherein one or more arms of the plurality of arms comprises a fractal shape, and wherein the cage surrounds but does not touch the antenna element.
Dependencies are inferred from the claim text.