Dielectric-free metal-only dipole-coupled radiating array aperture with wide field of view

1. A two-dimensional array of dipole-coupled radiator structures, each radiator structure comprising:

a ground surface having first and second openings disposed therethrough; and

a pair of antenna loops with each loop disposed in a respective plane perpendicular to the ground surface, a selected one of the loops having a first end shorted to the ground surface and a second end disposed in a respective one of the first and second openings, with the respective planes of the antenna loops oriented perpendicular to one another, wherein the loops comprise self-supporting metal-only structures such that the loops are not embedded in dielectric materials,

wherein the array comprises dual-polarized differentially-fed shorted dipoles.

2. A two-dimensional array of dipole-coupled radiator structures, each radiator structure comprising:

a ground surface having first and second openings disposed therethrough; and

a pair of antenna loops with each loop disposed in a respective plane perpendicular to the ground surface, a selected one of the loops having a first end shorted to the ground surface and a second end disposed in a respective one of the first and second openings, with the respective planes of the antenna loops oriented perpendicular to one another, wherein the loops comprise self-supporting metal-only structures such that the loops are not embedded in dielectric materials,

wherein the array comprises a first pair of loops disposed in a first plane and a second pair of loops disposed in a second plane orthogonal to the first plane to provide a plus-shaped configuration of loops, where each of the loops of the first and second pairs comprises an end proximate the center of the plus-shape which ends are shorted to the ground surface.

3. A two-dimensional array of dipole-coupled radiator structures, each radiator structure comprising:

a ground surface having first and second openings disposed therethrough; and

a pair of antenna loops with each loop disposed in a respective plane perpendicular to the ground surface, a selected one of the loops having a first end shorted to the ground surface and a second end disposed in a respective one of the first and second openings, with the respective planes of the antenna loops oriented perpendicular to one another, wherein the loops comprise self-supporting metal-only structures such that the loops are not embedded in dielectric materials,

wherein the array comprises a first pair of loops disposed in a first plane and a second pair of loops disposed in a second plane orthogonal to the first plane to provide a plus-shaped configuration of loops, where each of the loops of the first and second pairs comprises an end proximate the center of the plus-shape which ends are disposed in an opening through the ground surface.

4. The dipole-coupled radiator structure according to any one of claims 1 - 3 , wherein each loop of the pair of antenna loops includes a loop having a first end shorted to the ground surface and a second end disposed in a respective one of the first and second openings.

5. The dipole-coupled radiator structure according to any one of claims 1 - 3 , comprising RF transmitter/receiver circuits below the ground surface in electrical communication with the second end of each loop.

6. The two-dimensional array according to any one of claims 1 - 3 , comprising first and second adjacent antenna loops in the array which are capacitively coupled to one another.