Vault antenna for WLAN or cellular application

• US 8,686,909 B2
• Filed: 08/27/2010
• Issued: 04/01/2014
• Est. Priority Date: 08/28/2009
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: BelAir Networks Inc (Telefonaktiebolaget LM Ericsson)
• Inventors: Pell, Dave, Rayment, Stephen, Frank, Peter, Smith, Roland A.
• Primary Examiner(s): Jackson, Jr., Jerome
• Assistant Examiner(s): LINDGREN BALTZEL, ANDREA J
• Application Number:
  US12/870,259
• Publication Number:
  US 20110077036A1
• Time in Patent Office: 1,313 Days
• Field of Search: 455/507, 343/761, 343/834, 343/839
• US Class Current: 343/761
• CPC Class Codes: H01Q 1/04 Adaptation for subterranean or subaqueous use
• CPC Class Codes: H01Q 1/2233 used in consumption-meter devices, e.g. electricity, gas or water meters
• CPC Class Codes: H01Q 1/2291 used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN] H01Q1/241 takes precedence; WLAN in general H04W
• CPC Class Codes: H01Q 15/14 Reflecting surfaces; Equivalent structures electromagnetic shields H01Q1/526
• CPC Class Codes: H01Q 15/16 curved in two dimensions, e.g. paraboloidal
• CPC Class Codes: H01Q 19/106 using two or more intersecting plane surfaces, e.g. corner reflector antennas

Abstract

A fringe-effect vault antenna includes a communications vault having a non-conductive cover disposed substantially at ground level. An antenna element is positioned in the communications vault. A metallic reflector has an edge, positioned substantially parallel to the ground, where the metallic reflector and the edge are configured to cause an edge diffraction, or “fringe-effect” upon the RF fields of the antenna to cause those RF fields to diffract in a direction toward the ground.

Claims

1. A fringe-effect vault directional antenna, comprising:

a communications vault having a non-conductive cover disposed substantially at ground level;

an antenna element coupled to a mounting bracket and positioned in the communications vault; and

a rectangular metallic reflector coupled to said mounting bracket disposed substantially adjacent said antenna element, said rectangular metallic reflector having four vertically-sloped surfaces coupled to a substantially horizontal straight edge at an upper end of the vertically-sloped surface, the edge being positioned substantially parallel to the ground, the metallic reflector and the edge being configured to cause a fringe effect upon the RF signals of the antenna to cause said RF signals to bend in a direction toward the ground.

2. The fringe-effect vault antenna of claim 1, wherein the antenna element is disposed below ground level.

3. The fringe-effect vault antenna of claim 1, wherein the non-conductive vault cover is disposed slightly below ground level.

4. The fringe-effect vault antenna of claim 1, wherein the non-conductive vault cover is disposed at ground level.

5. The fringe-effect vault antenna of claim 1, wherein the non-conductive vault cover is disposed slightly above ground level.

6. The fringe-effect vault antenna of claim 1, wherein the non-conductive vault cover comprises a material selected from a group consisting of concrete, concrete polymer, and plastic.

7. The fringe-effect vault antenna of claim 1, wherein the antenna element is attached to the vault cover.

8. The fringe-effect vault antenna of claim 1, wherein the antenna element is supported by the metallic reflector.

9. The fringe-effect vault antenna of claim 1, wherein the metallic reflector comprises a sloped bracket configured to direct the RF signals toward the antenna element.

10. The fringe-effect vault antenna of claim 1, further including elevation tilt structure configured to tilt an elevation of the antenna such that a main beam of the RF signal is positioned toward said edge.

11. The fringe-effect vault antenna of claim 1, further including azimuth tilt structure configured to tilt an azimuth of the antenna.

12. The fringe-effect vault antenna of claim 1, further comprising an adjusting structure configured to adjust the reflector such that a main beam of the antenna element can be steered.

13. The fringe-effect vault antenna of claim 1, further comprising a mounting bracket configured such that the antenna element may be mounted in one of (i) lengthwise within the vault, and (ii) widthwise within the vault.

14. The fringe-effect vault antenna of claim 1, further comprising a bell jar attached to the vault cover, the bell jar being configured to maintain an air pocket around the antenna element.

15. The fringe-effect vault antenna of claim 1, wherein the vertically-sloped surface is integral with the substantially horizontal straight edge.

16. A fringe effect vault antenna system, comprising:

an antenna element coupled to a mounting bracket and;

a vault cover;

a metallic deflector plate coupled to the mounting bracket having four vertically-sloped surfaces and a substantially straight edge coupled to a top portion of each vertically-sloped portion to provide a fringe effect to signals of the antenna; and

a radio frequency cable, the antenna element, the deflector plate, and the radio frequency cable being integrated together into the vault cover, and the radio frequency cable being configured to couple energy from a received radio frequency signal into the at least one antenna element.

17. A system for providing WLAN or cellular radio coverage, the system comprising:

at least one wireless transceiver;

a means of wired connectivity; and

the fringe effect vault antenna of claim 16.

18. The system of claim 17, wherein the means of wired connectivity is selected from the group consisting of DOCSIS, DSL, ADSL, HDSL, VDSL, T1, and E1.

19. The system of claim 17, wherein the antenna element is configured to enable wide-band, multi-carrier operation.

20. The system of claim 17, wherein the at least one wireless transceiver comprises a plurality of wireless transceivers, and further comprising a plurality of antenna elements, each of the plurality of antenna elements corresponding to a different one of the plurality of wireless transceivers.

21. Fringe-effect RF omni-directional antenna structure, comprising:

an antenna element coupled to a mounting bracket;

a rectangular deflector coupled to said mounting bracket and having four vertically-sloped portions each configured to intersect a main beam of said antenna element; and

a substantially straight edge coupled to a top portion of each vertically-sloped portion and positioned to have a fringe-effect on the RF signals of said antenna element to bend the RF signals in a direction downward from said substantially straight edge.

22. Structure according to claim 21, wherein said mounting bracket, said deflector, and said edge comprise one integral piece.

23. A method of propagating RF signals with respect to a communication vault having an antenna element below ground level, comprising:

disposing a rectangular vertically-sloped deflector having four portions to intersect a main beam of the antenna element wherein said deflector and antenna are coupled to a mounting bracket; and

disposing a substantially straight edge coupled to a top portion of each vertically-sloped portion to cause a fringe effect on the RF signals of said antenna element to bend the RF signals in a direction toward the ground level.