Near field tunable parasitic antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJustin A. Church, Ricardo Santoyo-Mejia
Life of this patent
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Abstract
An antenna comprising: a conductive ground plane; a conductive half loop grounded to the ground plane and configured to be fed with a radio frequency (RF) signal; a single, unitary, three-sided, conductive cage positioned so as to cover the half loop; and dielectric mounts disposed between the cage and the ground plane such that the cage is electrically insulated from the ground plane.
Claims20
An antenna comprising:
- a conductive ground plane;
- a conductive half loop grounded to the ground plane and configured to be fed with a radio frequency (RF) signal;
- a single, unitary, three-sided, conductive cage positioned so as to cover the half loop;
- and
- dielectric mounts disposed between the cage and the ground plane such that the cage is electrically insulated from the ground plane.
A method for providing a tunable, electrically small antenna where ka<0.5, where the antenna fits within an imaginary sphere having a radius a, and where k is a wave number, comprising the following steps:
- providing a conductive ground plane;
- grounding a conductive half loop to a center of the ground plane;
- impedance matching the antenna by covering the conductive half loop with a single, unitary, three-sided, conductive cage so as to create capacitive fields that cancel inductive fields generated by the conductive half loop;
- electrically insulating the conductive cage from the ground plane by disposing dielectric mounts between the conductive cage and the ground plane;
- and
- feeding the conductive half loop with a radio frequency (RF) signal to create an omni-directional, linearly polarized radiation pattern.
Dependencies are inferred from the claim text.