Strip-type radiating cable for a radio communication system

• US 6,081,728 A
• Filed: 02/28/1997
• Issued: 06/27/2000
• Est. Priority Date: 02/28/1997
• Status: Expired due to Fees

• Current Assignee: Andrew Corporation (CommScope Holding Company, Inc.)
• Original Assignee: Andrew Corporation (CommScope Holding Company, Inc.)
• Inventors: Stein, Richard B., Ryman, Henry G., Paxman, Wesley R.
• Primary Examiner(s): Vo, Nguyen
• Assistant Examiner(s): Armstrong, Darnell R.
• Application Number:
  US08/810,303
• Time in Patent Office: 1,215 Days
• Field of Search: 333/237, 333/238, 333/246, 455/9, 455/11.1, 455/7, 455/523, 455/14, 455/517
• US Class Current: 455/523
• CPC Class Codes: H01Q 13/20 Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
• CPC Class Codes: H01Q 13/206 Microstrip transmission line antennas
• CPC Class Codes: H04B 5/28 using the near field of leaky cables, e.g. of leaky coaxial cables

Abstract

A distributed strip-type radiating cable comprised of a plurality of generally flat conductive strips disposed in substantially parallel relationship to one or more generally flat dielectric materials, adapted to radiate RF energy for communications applications. The radiating cable is designed to be efficiently and inexpensively manufactured and installed from lightweight, small size materials, and is designed to be easily attached and secured to a variety of surfaces.

Claims

1. A method of communicating among a multiplicity of radio units located within a prescribed space, said method comprising the steps of:

attaching an elongated distributed strip-type radiating cable to an elongated supporting surface within or adjacent to said prescribed space for transmitting radiated signals to, and receiving radiated signals from, said multiplicity of radio units along the length of the cable, via said cable,

said strip-type radiating cable comprising

a thin, generally planar, elongated dielectric strip,

a strip conductor affixed to a first side of said elongated dielectric strip and extending longitudinally along the length of said dielectric strip, and

a ground plane affixed to a second side of said dielectric strip and extending longitudinally along the length of said dielectric strip;

coupling said cable to transmitting and receiving equipment so as to cause said cable to transmit radiated signals to, and receive radiated signals from, said radio units along the length of the cable; and

receiving said radiated signals at said radio units and transmitting radiated signals from said radio units to said cable.

2. The method of claim 1 wherein said dielectric strip is a low-loss dielectric material.

3. The method of claim 1 wherein said prescribed space in which said radio units are located is a building, and said strip-type cable is attached to a supporting surface in said building.

4. The method of claim 3 wherein said strip-type cable is attached to a frame supporting ceiling tiles in said building.

5. The method of claim 1 wherein the width of said strip conductor and the dielectric constant and thickness of said dielectric strip are selected to produce a radiating field sufficient to communicate with said multiplicity of radio units along the entire length of said cable at the operating frequencies of said radio units.

6. The method of claim 1 wherein said strip-type cable is attached to said supporting surface with an adhesive coating on one side of said cable.

7. The method of claim 1 which includes, an outer layer of dielectric material covering both said strip conductor and said ground plane.

8. The method of claim 1 wherein said strip conductor extends along the center of said first side of said dielectric strip, and which includes a pair of outer strip conductors affixed to said first side of said dielectric strip on opposite sides of said center strip conductor and of substantially the same length as said center strip conductor.

14. The system of claim 1 wherein said strip-type cable is attached to said supporting surface with an adhesive coating on one side of said cable.

9. A wireless communication system comprising

a multiplicity of radio units located within a prescribed space,

an elongated distributed strip-type radiating cable attached to an elongated supporting surface within or adjacent to said prescribed space for transmitting radiated signals to, and receiving radiated signals from, said multiplicity of radio units along the length of the cable, via said cable,

said strip-type radiating cable comprising

a thin, generally planar, elongated dielectric strip,

a strip conductor affixed to a first side of said elongated dielectric strip and extending longitudinally along the length of said dielectric strip, and

a ground plane affixed to a second side of said dielectric strip and extending longitudinally along the length of said dielectric strip;

means for coupling said cable to transmitting and receiving equipment so as to cause said cable to transmit radiated signals to, and receive radiated signals from, said radio units along the length of the cable.

10. The system of claim 9 wherein said dielectric strip is a low-loss dielectric material.

11. The system of claim 9 wherein said prescribed space in which said radio units are located is a building, and said strip-type cable is attached to a supporting surface in said building.

12. The system of claim 11 wherein said strip-type cable is attached to a frame supporting ceiling tiles in said building.

13. The system of claim 9 wherein the width of said strip conductor and the dielectric constant and thickness of said dielectric strip are selected to produce a radiating field sufficient to communicate with said multiplicity of radio units along the entire length of said cable at the operating frequencies of said radio units.

15. The system of claim 9 wherein said cable includes, an outer layer of dielectric material covering both said strip conductor and said ground plane.

16. The system of claim 9 wherein said strip conductor extends along the center of said first side of said dielectric strip, and said cable includes a pair of outer strip conductors affixed to said first side of said dielectric strip on opposite sides of said center strip conductor and of substantially the same length as said center strip conductor.