Method and apparatus for a radio transceiver

• US 7,348,930 B2
• Filed: 01/19/2006
• Issued: 03/25/2008
• Est. Priority Date: 01/21/2005
• Status: Expired due to Fees

• Current Assignee: Woodbury Wireless LLC
• Original Assignee: Rotani, Inc.
• Inventors: Spenik, John, Lastinger, Roc, Woodbury, Brian C
• Primary Examiner(s): Nguyen; Hoang V
• Application Number:
  US11/275,605
• Publication Number:
  US 20060164318A1
• Time in Patent Office: 796 Days
• Field of Search: 343/841, 343/851, 343/844, 343/834
• US Class Current: 343/844
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 1/526 Electromagnetic shields
• 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
• CPC Class Codes: H01Q 3/00 Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system means for positioning H01Q1/125
• CPC Class Codes: H04B 7/0495 using overlapping sectors in the same base station to implement MIMO for antennas

Abstract

A wireless radio transceiver which reduces interference between antennas positioned in substantially close proximity is disclosed. The exemplary radio transceiver comprises at least two radios, at least one antenna interfacing with each of the radios, at least one antenna spacer mounted to each of the antennas, and at least one shield, wherein each of the antenna spacers are mounted to one of the shields.

Claims

1. A radio transceiver, comprising:

a first radio and a second radio that transmit and receive using a first frequency and a second frequency respectively;

a first antenna and a second antenna having a first coverage area and a second coverage area respectively, the first antenna and the second antenna couple to the first radio and the second radio respectively;

a first antenna spacer and a second antenna spacer mount to the first antenna and the second antenna respectively; and

a shield having a size, a first side, and a second side;

wherein;

the first antenna spacer mounts to the first side thereby positioning the first antenna a first distance from the first side;

the second antenna spacer mounts to the second side thereby positioning the second antenna a second distance from the second side;

a distance between the first antenna and the second antenna comprises at most two times the wavelength of at least one of the first frequency and the second frequency; and

the first coverage area overlaps the second coverage area thereby forming at least one virtual sector.

2. The radio transceiver of claim 1 wherein at least one of the first radio and the second radio is packaged in a metal container, and wherein the metal container comprises the shield.

3. The radio transceiver of claim 1 wherein at least one of the first distance and the second distance is about 50/1000 of the wavelength of at least one of the first frequency and the second frequency.

4. The radio transceiver of claim 1 further comprising a third antenna having a third coverage area, wherein:

the third antenna couples to the first radio;

the first antenna and the third antenna operate as a MIMO antenna.

5. The radio transceiver of claim 4 wherein the first antenna coverage area and the third antenna coverage area substantially overlap.

6. The radio transceiver of claim 5 further comprising a fourth antenna having a fourth coverage area, wherein:

the fourth antenna couples to the second radio;

the second antenna and the fourth antenna operate as a MIMO antenna.

7. The radio transceiver of claim 6 wherein the second antenna coverage area and the fourth antenna coverage area substantially overlap.

8. The radio transceiver of claim 7 wherein the first antenna and the third antenna are positioned relative to each other at least one of parallel, perpendicular, at a predetermined angle, and in different planes.

9. The radio transceiver of claim 7 wherein the second antenna and the fourth antenna are positioned relative to each other at least one of parallel, perpendicular, at a predetermined angle, and in different planes.

10. The radio transceiver of claim 1 further comprising a second shield, wherein the second antennas spacer mounts to the second shield.

11. A radio transceiver, comprising:

a first radio and a second radio that transmit and receive using a first frequency and a second frequency respectively;

a first group of at least two antennas and a second group of at least two antennas, each one of the antennas having a respective coverage area, the antennas of the first group and the antennas of the second group couple to the first radio and the second radio respectively;

a shield having a size, a first side, and a second side;

wherein;

the at least two antennas of the first group mount to the first side at respective first group antenna positions;

the at least two antennas of the second group mount to the second side at respective second group antenna positions;

the at least two antennas of the first group operate as a first MIMO antenna;

the coverage area of each one of the at least two antennas of the first group substantially overlaps the coverage area of every other antenna of the first group thereby forming a third coverage area;

the at least two antennas of the second group operate as a second MIMO antenna;

the coverage area of each one of the at least two antennas of the second group substantially overlaps the coverage area of every other antenna of the second group thereby forming a fourth coverage area;

a distance between the first group and the second group comprises at most two times the wavelength of at least one of the first frequency and the second frequency.

at least one of the size, the first group antenna positions, and the second group antenna positions is adjusted in such a manner that the third coverage area overlaps the fourth coverage area thereby forming at least one virtual sector.

12. The radio transceiver of claim 11, wherein any two of the antennas of at least one of the first group and the second group are positioned with respect to each other at least one of substantially parallel, substantially at a predetermined angle, substantially perpendicular, and substantially in different planes.

13. The radio transceiver of claim 11, wherein at least one of the antennas of at least one of the first group and the second group is positioned with respect to the shield at least one of substantially parallel, substantially at a predetermined angle, substantially perpendicular, and substantially in a different plane.

14. The radio transceiver of claim 11, wherein at least one of the first group and the second group comprises at least one of two, three, four, five and six antennas.

15. A method for adjusting interference, comprising:

selecting an antenna;

detecting at least one of an interference and a data throughput as received by the selected antenna;

detecting a virtual sector size;

adjusting at least one of a shield size, a shield spacing, an antenna position relative to a shield, and an antenna spacer size;

repeating selecting, detecting, detecting, and adjusting until a desired threshold of at least one of the virtual sector size, the interference and the data throughput for each antenna is attained.

16. The method of claim 15, wherein detecting the interference comprises at least one of detecting a signal strength and detecting a signal-to-noise ratio.

17. The method of claim 15, wherein the desired threshold of the data throughput comprises a maximum data throughput.

18. A radio transceiver that provides at least two virtual sectors, the transceiver comprising:

a first radio and a second radio that transmit and receive using a first channel and a second channel respectively;

a first directional antenna and a second directional antenna having a first coverage area and a second coverage area respectively, the first antenna and the second antenna couple to the first radio and the second radio respectively;

wherein;

the first coverage area overlaps the second coverage area on a first side thereby forming a first virtual sector;

the first coverage area overlaps the second coverage area on a second side thereby forming a second virtual sector;

the first virtual sector does not overlap the second virtual sector;

the first channel and the second channel comprise different channels.