Cellular antenna for elevated and obstructed deployment

• US 10,340,583 B2
• Filed: 10/12/2018
• Issued: 07/02/2019
• Est. Priority Date: 10/13/2017
• Status: Active Grant

• Current Assignee: Quintel Cayman Limited
• Original Assignee: Quintel Cayman Limited
• Inventors: Barker, David Edwin, Song, Peter Chun Teck
• Primary Examiner(s): Doan, Phuoc H
• Application Number:
  US16/158,876
• Publication Number:
  US 20190115650A1
• Time in Patent Office: 263 Days
• Field of Search: 370335, 370342, 4554561, 375208, 342368
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 21/22 Antenna units of the array energised non-uniformly in amplitude or phase, e.g. tapered array or binomial array
• 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 3/36 with variable phase-shifters
• CPC Class Codes: H01Q 3/40 with phasing matrix
• CPC Class Codes: H04B 7/043 using best eigenmode, e.g. beam forming or beam steering
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/12 Frequency diversity

Abstract

In one example, the present disclosure provides a phased array antenna system with a first array of antenna elements and a first radio frequency beamforming network configured to split the power of a radio frequency signal for transmission into a first plurality of component signals comprising drive signals for the first array of antenna elements, the first radio frequency beamforming network further configured to combine a radio frequency signal for reception by the phased array antenna system from a second plurality of component signals from the first array of antenna elements, where a radio frequency power distribution of the first radio frequency beamforming network is arranged to provide a weighting of the first plurality and the second plurality of component signals processed via antenna elements towards one end of the first array.

Claims

1. A phased array antenna system, comprising:

at least a first array of antenna elements; and

at least a first radio frequency beamforming network configured to split the power of a radio frequency signal for transmission into a first plurality of component signals, the first plurality of component signals comprising drive signals for the at least the first array of antenna elements, the at least the first radio frequency beamforming network further configured to combine a radio frequency signal for reception by the phased array antenna system from a second plurality of component signals from the at least the first array of antenna elements, where a radio frequency power distribution of the at least the first radio frequency beamforming network is arranged to provide a weighting of the first plurality of component signals and the second plurality of component signals processed via antenna elements of the plurality of antenna elements towards one end of the at least the first array.

2. The phased array antenna system of claim 1, where amplitude weights and phase weights of the at least the first radio frequency beamforming network are arranged to develop a directive beam and suppressed side-lobes over a range of angles in a far field of the phased array antenna system, wherein a beam pattern of the directive beam is suitable for cellular mobile communications networks.

3. The phased array antenna system of claim 1, where amplitude weights of the at least the first radio frequency beamforming network are arranged to provide the radio frequency power distribution comprising an allocation of at least 73% of a total radio frequency power to 50% or fewer of the antenna elements towards the one end of the at least the first array.

4. The phased array antenna system of claim 1, where amplitude weights of the at least the first radio frequency beamforming network are arranged to provide the radio frequency power distribution comprising an allocation of at least 80% of a total radio frequency power to 50% or fewer of the antenna elements towards the one end of the at least the first array.

5. The phased array antenna system of claim 1, where the at least the first array is arranged in a vertical plane for beamforming in an elevation plane.

6. The phased array antenna system of claim 1, where the at least the first array is for deployment on a building rooftop.

7. The phased array antenna system of claim 6, where at least a first array is for deployment away from edges of the building rooftop such that the appearance of the at least the first array is minimized when viewed from a ground level.

8. The phased array antenna system of claim 1, where upper side-lobes of a far field radiation pattern of the at least the first array are suppressed by 15 dB or greater relative to a mainbeam of the far field radiation pattern over a range of up to 30 degrees above the mainbeam.

9. The phased array antenna system of claim 1, where the antenna system comprises a plurality of antenna arrays, the plurality of antenna arrays including the at least the first array, and a plurality of radio frequency beamforming networks, the plurality of radio frequency beamforming networks including the at least the first radio frequency beamforming network, the plurality of antenna arrays and the plurality of radio frequency beamforming networks designed to support at least one of:

radio frequency diversity schemes;

multiple spectrum bands;

or

multi-order multiple in-multiple out applications.

10. The phased array antenna system of claim 1, where the at least the first radio frequency beamforming network is a passive, reciprocal beamforming network.

11. The phased array antenna system of claim 1, where the at least the first array is an active antenna array, and where the at least the first radio frequency beamforming network is implemented at baseband using precoding vectors configured to be applied to user orientated data to develop user specific beamforming from the antenna system.

12. A method, comprising:

deploying at least a first array of antenna elements of a radio frequency antenna system to a building rooftop, wherein the at least the first array of antenna elements is coupled to at least a first radio frequency beamforming network of the radio frequency antenna system, wherein the at least a first radio frequency beamforming network is configured to split the power of a radio frequency signal for transmission into a first plurality of component signals, the first plurality of component signals comprising drive signals for the at least the first array of antenna elements, the at least the first radio frequency beamforming network further configured to combine a radio frequency signal for reception by the phased array antenna system from a second plurality of component signals from the at least the first array of antenna elements, where a radio frequency power distribution of the at least the first radio frequency beamforming network is arranged to provide a weighting of the first plurality of component signals and the second plurality of component signals processed via antenna elements of the plurality of antenna elements towards one end of the at least the first array; and

performing at least one of;

transmitting the radio frequency signal for transmission via the at least the first radio frequency beamforming network and the at least the first array;

or

receiving the radio frequency signal for reception via the at least the first array and the at least the first radio frequency beamforming network.

13. The method of claim 12, wherein the deploying comprises deploying the at least the first array away from edges of the building rooftop such that the appearance of the at least the first array is minimized when viewed from a ground level.

14. The method of claim 12, where amplitude weights and phase weights of the at least the first radio frequency beamforming network are arranged to develop a directive beam and suppressed side-lobes over a range of angles in a far field of the phased array antenna system, wherein a beam pattern of the directive beam is suitable for cellular mobile communications networks.

15. The method of claim 12, where amplitude weights of the at least the first radio frequency beamforming network are arranged to provide the radio frequency power distribution comprising an allocation of at least 73% of a total radio frequency power to 50% or fewer of the antenna elements towards the one end of the at least the first array.

16. The method of claim 12, where amplitude weights of the at least the first radio frequency beamforming network are arranged to provide the radio frequency power distribution comprising an allocation of at least 80% of a total radio frequency power to 50% or fewer of the antenna elements towards the one end of the at least the first array.

17. The method of claim 12, where upper side-lobes of a far field radiation pattern of the at least the first array are suppressed by 15 dB or greater relative to a mainbeam of the far field radiation pattern over a range of up to 30 degrees above the mainbeam.

18. The method of claim 12, where the antenna system comprises a plurality of antenna arrays, the plurality of antenna arrays including the at least the first array, and a plurality of radio frequency beamforming networks, the plurality of radio frequency beamforming networks including the at least the first radio frequency beamforming network, the plurality of antenna arrays and the plurality of radio frequency beamforming networks designed to support at least one of:

radio frequency diversity schemes;

multiple spectrum bands;

or

multi-order multiple in-multiple out applications.

19. The method of claim 12, where the at least the first radio frequency beamforming network is a passive, reciprocal beamforming network.

20. The method of claim 12, where the at least the first array is an active antenna array, and where the at least the first radio frequency beamforming network is implemented at baseband using precoding vectors configured to be applied to user orientated data to develop user specific beamforming from the antenna system.