WIRELESS SIGNAL PROPAGATION APPARATUS

• US 20140106665A1
• Filed: 09/27/2013
• Published: 04/17/2014
• Est. Priority Date: 10/11/2012
• Status: Active Grant

• Current Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Original Assignee: Rolls-Royce PLC (Rolls-Royce Holdings Plc)
• Inventors: EDWARDS, Huw Llewelyn, ONG, Max Chien Yee, THOMPSON, Haydn Ashley
• Granted Patent: US 9,306,656 B2
• Time in Patent Office: Days
• US Class Current: 455/14
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 3/06 over a restricted angle
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H04B 7/145 Passive relay systems

Abstract

There is provided apparatus for propagation of a wireless signal through a barrier comprising a first antenna for location on a first side of the barrier, a second antenna for location on a second side of the barrier and a waveguide. The waveguide comprises a conducting member passing through the barrier between the first and second sides. The conducting member is held within an insulator sleeve such that it is spaced from a surrounding metal wall of the waveguide. A wireless signal received by the waveguide on the first side of the barrier is transmitted through the barrier by Transverse Electro-Magnetic (TEM) mode propagation along the waveguide is re-radiated on the second side.

Claims

1. Apparatus for propagation of a wireless signal through a barrier, the apparatus comprising:

a first antenna for location on a first side of the barrier,

a second antenna for location on a second side of the barrier, and

a waveguide, the waveguide comprising a conducting member arranged to pass through said barrier between the first and second sides, the conducting member being held spaced from a surrounding metal wall of the waveguide, whereby in use a wireless signal received by the waveguide on the first side of the barrier is transmitted along the waveguide and re-radiated on the second side,

wherein the conducting member comprises an existing wire or cable passing through the barrier, the first antenna comprises a wireless signal transmitter spaced from a portion of the conducting member on the first side of the barrier and the second antenna optionally comprises a wireless signal receiver spaced from a portion of the conducting member on the second side of the barrier,

and wherein an EMI choke is provided on the existing wire or cable on either or both sides of the barrier at a predetermined spacing from the barrier.

2. Apparatus for propagation of a wireless signal through a barrier, the apparatus comprising:

a first antenna for location on a first side of the barrier,

a second antenna for location on a second side of the barrier, and

a waveguide, the waveguide comprising a conducting member arranged to pass through said barrier between the first and second sides, the conducting member being held spaced from a surrounding metal wall of the waveguide, whereby in use a wireless signal received by the waveguide on the first side of the barrier is transmitted along the waveguide and re-radiated on the second side.

3. Apparatus according to claim 2, wherein in said use a wireless signal is transmitted through the barrier between the conducting member and the surrounding metal wall by Transverse Electro-Magnetic (TEM) mode propagation along the waveguide.

4. Apparatus according to claim 2, wherein the conducting member is held in the passage within an insulating sleeve interposed between the conducting member and the surrounding metal wall.

5. Apparatus according to claim 2, wherein the conducting member has a first end portion arranged to terminate on the first side of the barrier, a second end portion arranged to terminate on the second side of the barrier and an intermediate portion there-between, wherein either or both of the first and second end portions are integral with or connected to the respective first or second antenna.

6. Apparatus according to claim 5, wherein the first and/or second end portion protrudes beyond the surrounding metal wall and provides the respective first and/or second antenna.

7. Apparatus according to claim 5, wherein the first and/or second end portion of the conducting member is exposed.

8. Apparatus according to claim 5, wherein the first and/or second end portion comprises a connector formation for the respective first and/or second antenna.

9. Apparatus according to claim 8, wherein the first and/or second antenna comprises a directional and/or actuable antenna device.

10. Apparatus according to claim 2, wherein the barrier is a metal barrier having a passage therethrough, the passage having opposing openings on the first and second sides of the barrier, the material of the metal barrier about said passage providing the surrounding metal wall of the waveguide.

11. Apparatus according to claim 10, wherein a coaxial cable having an inner conductor and an outer metal shield is disposed within the passage, the outer metal shield of the coaxial cable forming the conducting member of the waveguide.

12. Apparatus according to claim 2, wherein the surrounding metal wall comprises a metal sleeve disposed about the insulating material and arranged to be insertable in the barrier between the first and second sides thereof.

13. Apparatus according to claim 2, wherein the conducting member comprises an existing wire or cable passing through the barrier, the first antenna comprises a wireless signal transmitter spaced from a portion of the conducting member on the first side of the barrier, and the second antenna optionally comprises a wireless signal receiver spaced from a portion of the conducting member on the second side of the barrier.

14. Apparatus according to claim 13, wherein the first and/or second antenna are held at a predetermined spacing and orientation relative to the conducting member to permit signal transmission therebetween.

15. Apparatus according to claim 13, wherein the first and/or second antenna are held at a distance of one or two wavelength or less from the conducting member with respect to the wavelength of the wireless signal being transmitted, optionally wherein the spacing between the first and/or second antenna and conducting member is approximately a quarter of a wavelength with respect to the wavelength of the wireless signal being transmitted.

16. Apparatus according to claim 13, wherein the first and/or second antenna is elongate in form and is substantially parallel with the respective portion of the conducting member.

17. Apparatus according to claim 13, wherein an EMI choke is provided on the existing wire or cable on either or both sides of the barrier at a predetermined spacing from the barrier.

18. Apparatus according to claim 2, wherein the barrier comprises a wall of an enclosure, the first side being in the interior of the enclosure and the second side being external to the enclosure.

19. Apparatus according to claim 2, further comprising a wireless communication device on either or both sides of the barrier, wherein the conducting member of the waveguide is electrically isolated from the wireless communication device.

20. A wireless signal transmission network comprising a plurality of enclosures each having a barrier and apparatus according to claim 2.