Multichannel access point with collocated isolated antennas

• US 6,933,909 B2
• Filed: 03/18/2003
• Issued: 08/23/2005
• Est. Priority Date: 03/18/2003
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Theobold, David M.
• Primary Examiner(s): Dinh, Trinh Vo
• Application Number:
  US10/391,099
• Publication Number:
  US 20040183726A1
• Time in Patent Office: 889 Days
• Field of Search: H01/Q02.1/00, H01/Q00.1/38, 343/893, 343/853, 343/700.MS, 343/725, 343/729, 343/826, 343/872, 343/799
• US Class Current: 343/893
• CPC Class Codes: H01Q 1/007 specially adapted for indoor communication
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 21/20 the units being spaced along or adjacent to a curvilinear path slotted waveguide arrays H01Q21/005; circularly or helically slotted waveguides H01Q21/0062
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00

Abstract

A wireless telecommunications device is disclosed including a plurality of wireless antennas, each respectively for transmitting and/or receiving wireless signals into a predetermined sector of an omnidirectional space. A mounting structure is included for retaining the respective plurality of wireless antennas, wherein the mounting structure is configured so as to isolate the respective wireless signals.

Claims

1. A wireless telecommunications device consisting of:

four wireless antennas, each respectively for at least one of transmitting and receiving wireless signals into a predetermined sector of an omnidirectional space; and

a mounting structure comprising slanted sides for retaining the respective four wireless antennas;

wherein the predetermined sector for each antenna is normal to the slanted side retaining the antenna; and

wherein the mounting structure is configured so that the normals of the all slanted sides retaining the four wireless antennas are nearly mutually perpendicular with each other.

2. The wireless telecommunications device of claim 1 wherein at least one of the wireless antennas comprises a patch antenna having a predetermined front-to-back ratio and depolarization.

3. The wireless telecommunications device of claim 1 wherein the mounting structure is configured to retain the respective wireless antennas at a predetermined separation from each other.

4. The wireless telecommunications device of claim 3 wherein the predetermined separation between the respective antennas is at least two wavelengths of the wireless signals.

5. The wireless telecommunications device of claim 1 wherein each of the four wireless antennas transmit and receive signals over the same wireless signal bandwidth.

6. The wireless telecommunications device of claim 1 wherein each antenna covers a different predetermined sector of the omnidirectional space.

7. The wireless telecommunications device of claim 1 wherein the four antennas comprise at least one diversity antenna pair.

8. A system of collocated, isolated antennas, comprising:

four unidirectional wireless antennas, each respectively for at least one of transmitting and receiving wireless signals in a predetermined direction; and

a mounting structure with no more than four slanted antenna-retaining sides wherein each of the antenna-retaining sides retains one of the respective four wireless antennas, and the mounting structure is configured such that the predetermined direction of each of the four unidirectional antenna is normal to its corresponding slanted antenna-retaining side and the predetermined directions of all the wireless antennas are nearly mutually perpendicular with each other.

9. The system of collocated, isolated antennas of claim 8, wherein at least one of the wireless antennas comprises a patch antenna having a predetermined front-to-back ratio and depolarization.

10. The system of collocated, isolated antennas of claim 8 wherein each of the four wireless antennas transmit and receive signals over the same wireless signal band.

11. The system of collocated, isolated antennas of claim 8 wherein the four antennas comprise at least one diversity antenna pair.

12. The system of collocated, isolated antennas of claim 8, wherein at least one of the four unidirectional wireless antennas comprises a linearly polarized patch antennas with a parasitic element.

13. The system of collocated, isolated antennas of claim 12, wherein the patch antennas has a front to back ratio of at least 20 dB.

14. The system of collocated, isolated antennas of claim 8, the mounting structure further comprising a face surface coupled to the slanted sides, wherein angle of inclination between the face surface and each of the slanted sides retaining the four wireless unidirectional antennas is about 45 degrees.

15. The system of collocated, isolated antennas of claim 14, wherein at least one of the four unidirectional wireless antennas comprises a linearly polarized patch antennas with a parasitic element.

16. The system of collocated, isolated antennas of claim 15, wherein the patch antennas has a front to back ratio of at least 20 dB.