Omni-directional antenna system and device for MIMO applications
Omni-directional orthogonally-polarized antenna system for MIMO applications are disclosed herein. An example antenna system can have two arrays of horizontally polarized radiating elements, and two arrays of vertically polarized radiating elements, each array having roughly 180-degree radiation pattern, disposed about a central axis in a common horizontal plane, arrays of common polarization separated by 180-degrees, such that MIMO processing of signals to the arrays of common polarization results in a radiation pattern that is substantially constant over 360-degrees in azimuth.
1. An antenna system comprising:
two arrays of horizontally polarized radiating elements and two arrays of vertically polarized radiating elements, each array having a roughly 180-degree radiation pattern, disposed about a central axis in a common horizontal plane, arrays of common polarization separated by 180 degrees, the horizontally polarized radiating elements comprising a plurality of slot elements and the vertically polarized radiating elements comprising a plurality of dipole elements, each of the plurality of slot elements and each of the plurality of dipole elements comprising a metallic radiating material electrically coupled to a trace, each of the plurality of slot elements having a substantially T-shaped configuration, each of the plurality of dipole elements comprising a line of division, the line of division being a surface area absent metallic radiating material disposed on each of the plurality of dipole elements, the line of division separating adjacent radiating portions; and
at least one printed circuit board body forming a saw tooth pattern, the plurality of slot elements and the plurality of dipole elements being disposed on the at least one printed circuit board body, wherein uniform coverage in both vertical and horizontal polarization over 360 degrees is provided using beamforming and polarization diversity.
2. The antenna system according to claim 1 , further comprising a first metal extrusion and a second metal extrusion that wherein a first of the two arrays of horizontally polarized radiating elements is disposed within an enclosure of the first metal extrusion and a second of the two arrays of horizontally polarized radiating elements is disposed within an enclosure of the second metal extrusion.
3. The antenna system according to claim 2 , wherein the plurality of slot elements of the first of the two arrays of horizontally polarized radiating elements and the plurality of slot elements of the second of the two arrays of horizontally polarized radiating elements are aligned with slot openings in the first metal extrusion and the second metal extrusion, respectively.
4. The antenna system according to claim 3 , wherein the two arrays of vertically polarized radiating elements are positioned between the first metal extrusion and the second metal extrusion.
5. The antenna system according to claim 4 , wherein the two arrays of vertically polarized radiating elements have the plurality of dipole elements that partially extend beyond an outer periphery of a core assembly that is formed by both the first metal extrusion and the second metal extrusion.
6. The antenna system according to claim 1 , wherein the plurality of dipole elements of the two arrays of vertically polarized radiating elements are formed on a printed circuit board body, each of the plurality of dipole elements having a body and a head that are substantially T-shaped.
7. The antenna system according to claim 6 , wherein the radiating surface of the plurality of dipole elements comprises the line of division that separates adjacent radiating portions.
8. The antenna system according to claim 7 , wherein the plurality of dipole elements are electrically coupled to a corporate feed, the corporate feed being coupled to a feed point.
9. The antenna system according to claim 1 , wherein the plurality of slot elements of the two arrays of horizontally polarized radiating elements are formed on the at least one printed circuit board body, each of the plurality of slot elements being a tab that extends from the at least one printed circuit board body.
10. A device, comprising:
a cylindrical radome housing; and
an antenna system located within the cylindrical radome housing, the antenna system comprising a core assembly comprising two tubular metal extrusions, the two tubular metal extrusions enclosing slot arrays comprising a first pair of printed circuit boards each having a plurality of slot elements that are horizontally polarized, the antenna system further comprising dipole arrays comprising a second pair of printed circuit boards each having a plurality of dipole elements that are vertically polarized, each of the plurality of slot elements and each of the plurality of dipole elements comprising a metallic radiating material electrically coupled to a trace, each of the plurality of slot elements having a substantially T-shaped configuration, each of the plurality of dipole elements comprising a line of division, the line of division being a surface area absent metallic radiating material disposed on each of the plurality of dipole elements, the line of division separating adjacent radiating portions, the second pair of printed circuit boards being positioned between the two tubular metal extrusions, in order to provide uniform coverage in both vertical and horizontal polarization over 360 degrees, each circuit board of the first pair and the second pair of printed circuit boards forming a saw tooth pattern.
11. The device according to claim 10 , wherein arrays of common polarization between the slot arrays and the dipole arrays are separated by 180 degrees.
12. The device according to claim 10 , further comprising a multiple input multiple output processor electrically coupled to a corporate feed, the corporate feed configured to serve each of the slot arrays and the dipole arrays.
13. The device according to claim 10 , wherein the slot arrays are disposed within receiver slots of the two tubular metal extrusions.
14. The device according to claim 13 , wherein the dipole arrays are aligned with one another in a first plane and the slot arrays are spaced apart from and are parallel with the first plane.
15. The device according to claim 13 , wherein radiating surfaces of the dipole arrays are oppositely faced relative to one another.
16. The device according to claim 15 , wherein each of the radiating surfaces of the plurality of dipole elements comprise a line of division that separates adjacent radiating portions.
17. The device according to claim 16 , wherein the plurality of slot elements are formed on a printed circuit board body, each of the plurality of slot elements being a tab that extends from the printed circuit board body.
18. The antenna system according to claim 2 , wherein a rear surface of the first metal extrusion and a rear surface of the second metal extrusion are arranged into a configuration to form a metal chamber comprising a metal ground plane.
19. The device according to claim 10 , wherein a rear surface of the first metal extrusion and a rear surface of the second metal extrusion are arranged into a configuration to form a metal chamber comprising a metal ground plane.
20. The antenna system according to claim 1 , wherein each of the plurality of slot elements aligns with a plurality of slot openings, respectively.
21. The device according to claim 10 , wherein each of the plurality of slot elements aligns with a plurality of slot openings, respectively.