Dynamically optimized smart antenna system

• US 7,162,273 B1
• Filed: 11/10/2000
• Issued: 01/09/2007
• Est. Priority Date: 11/10/2000
• Status: Expired due to Term

• Current Assignee: Airgain Incorporated
• Original Assignee: Airgain Incorporated
• Inventors: Abramov, Oleg Y., Kirdin, Alexander N., Kashkarov, Alexander G.
• Primary Examiner(s): Urban; Edward F.
• Assistant Examiner(s): JACKSON, BLANE J
• Application Number:
  US09/709,758
• Time in Patent Office: 2,251 Days
• Field of Search: 455/269, 455/272, 455/273, 455/277.1, 455/277.2, 455/280, 455/288, 455/289, 455/291, 455/293, 455/561.1, 455/278.1, 455/434, 343/700.MS, 343/754, 343/766, 343/890, 343/898, 342/383
• US Class Current: 455/562.1
• CPC Class Codes: H01Q 3/04 for varying one co-ordinate of the orientation
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40

Abstract

A wireless communications network includes a plurality of wireless devices equipped with direction-agile antenna systems to allow the wireless devices to establish and maintain wireless data links with each other.

Claims

1. A system for use in establishing and maintaining wireless data links, the system comprising:

an antenna system capable of being selectively configured to transmit or receive an electromagnetic signal in a plurality of selected patterns; and

a controller coupled to the antenna system and configured to transmit at least one polling request through the antenna system, detect one or more responses to the at least one polling request while the antenna system is configured in at least two different selected patterns, determine a selected pattern for the antenna system based on the responses to the polling request received while the antenna system is configured in the at least two different selected patterns and transmit a signal to the antenna system indicating the selected pattern for the antenna system.

2. The system of claim 1 wherein said antenna system comprises a plurality of elements and at least one of the plurality of elements is configured to transmit an electromagnetic signal in a different pattern than another of the elements.

3. The system of claim 2 wherein at least one of the elements is configured to be activated while other elements are switched off to transmit the electromagnetic signal in the selected pattern of transmission.

4. The system of claim 1, wherein the antenna system comprises a plurality of elements and the controller is further configured to transmit the polling requests from all of the elements.

5. The system of claim 1 wherein the controller is configured to transmit a first polling request while the antenna system is configured in a first selected pattern and to transmit a second polling request while the antenna system is configured in a second selected pattern.

6. The system of claim 1 wherein the controller comprises circuitry which is integrated with a surface on which at least one of the elements is disposed.

7. The system of claim 1 wherein the controller is further configured to transmit a signal to the antenna system to scan in multiple patterns and detect a response to the polling request during the scanning of the antenna system.

8. The system of claim 2 wherein at least some of the elements are arranged as a phased array.

9. The system of claim 1 wherein said controller is further configured to store the selected pattern for later communication with a device which transmitted the one or more responses to the at least one polling request.

10. A method of improving a wireless communication link using an antenna system having multiple patterns, the method comprising:

transmitting at least one request from the antenna system;

scanning the antenna system in multiple patterns;

detecting responses to the request while the antenna system is configured in at least two different selected patterns during the scanning;

determining a pattern of the antenna system based on the detected responses; and

transmitting or receiving a signal from the antenna system in the determined pattern.

11. The method of claim 10 wherein the antenna system comprises a plurality of elements and said at least one request is transmitted from all of the antenna elements of the antenna system.

12. The method of claim 10 further comprising selecting a scanning speed for said antenna system which is different from the scanning speed of an additional antenna system in said communication link.

13. The method of claim 10 further comprising the step of changing patterns for said antenna system at a rate which is different from the rate at which patterns are changed by an additional antenna system in said communication link.

14. The method of claim 10 wherein patterns correspond to directions and scanning the antenna system in multiple patterns includes scanning in azimuth and elevation directions.

15. The method of claim 10 wherein determining a pattern of the antenna system comprises:

detecting a pattern of a signal carrying a response to the request by scanning of the antenna system.

16. The method of claim 10, wherein determining the pattern of the antenna system comprises:

comparing one or more characteristics of a signal carrying a response to the request detected at different times during the scanning.

17. The method of claim 10 further comprising:

monitoring characteristics of a signal received by the antenna system,

determining if the characteristics meet predetermined criteria, and

if the predetermined criteria are met, scanning the antenna system in multiple patterns.

18. The method of claim 10 further comprising:

monitoring characteristics of a signal received by the antenna system as the pattern of the antenna system is changed and adjusting the pattern of the antenna system based upon the monitoring of the characteristics.

19. The method of claim 10 further comprising:

if an expected signal is not received, scanning the antenna system in multiple patterns.

20. The method of claim 10 wherein the antenna system has a plurality of antenna elements and scanning the antenna system in multiple patterns comprises shifting the phases of signals received by different antenna elements of the antenna system.

21. The method of claim 20 wherein transmitting at least one request from the antenna system comprises transmitting a request from all of the antenna elements.

22. The method of claim 10 further comprising recording the determined pattern for later use.

23. The method of claim 10 wherein the request is a polling request and the responses are transmitted according to the I.E.E.E. 802.11 standard.

24. The method of claim 10 wherein the step of scanning the antenna system is carried out by first activating a first antenna element and reflector and then activating a second element and a reflector.

25. A method for use in establishing and maintaining wireless communications using an antenna system with the capability to transmit and receive signals in a direction having a positive antenna gain and to vary that, the method comprising:

transmitting a communication from the antenna system;

electronically steering the antenna gain of the antenna system through multiple directions;

detecting a response signal to the communication while the antenna system is being steered through multiple directions;

selecting the direction of the antenna gain based upon at least one characteristic of the response signal received at different directions of the antenna gain; and

transmitting or receiving a signal from the antenna system in the selected direction.

26. A method of improving a wireless communication link using an antenna system with the capability to transmit and receive signals in more than one pattern, the method comprising:

transmitting from a device one or more signals that expect a response;

receiving one or more signals that expect a response at the antenna system from a device when the antenna system is configured in at least two different selected patterns;

determining a pattern of the antenna system based on the received signals; and

transmitting a response to the one or more signals that request a response in the determined pattern.

27. The method of claim 26 wherein the one or more signals that expect a response are requests for a data link.

28. The method of claim 26 wherein determining a direction for the gain of the antenna system comprises:

detecting a beam pattern of the one or more signals that expect a response.

29. The method of claim 26, wherein determining a pattern of the antenna system comprises:

comparing characteristics of the one or more signals that expect a response which were received when the antenna system was configured in at least two different selected patterns.

30. The method of claim 26 further comprising:

monitoring characteristics of a signal received by the antenna system.

31. The method of claim 26 further comprising:

monitoring characteristics of a signal received by the antenna system as the pattern of the antenna beam is changed.

32. The method of claim 26 wherein the antenna system has a plurality of antenna elements and configuring the antenna system in at least two different selected patterns comprises activating and switching off different antenna elements of the antenna system.

33. The method of claim 26 wherein the antenna system has a plurality of antenna elements and configuring the antenna system in at least two different selected patterns comprises shifting the phases of signals received by different antenna elements of the antenna system.

34. The method of claim 26 further comprising recording the determined direction for later use in communicating with the device.

35. An antenna system for use in establishing and maintaining wireless data links, the system comprising:

an antenna having a plurality of antenna elements arranged for use as a phased array capable of selectively transmitting or receiving an electromagnetic signal in a plurality of patterns; and

a controller coupled to the antenna and configured to

transmit polling requests through the antenna,

detect responses to the polling requests while the antenna is configured in at least two different selected patterns,

determine a selected pattern of the antenna for transmitting or receiving based on the responses to the polling requests,

transmit a signal to the antenna indicating the selected pattern of the antenna.

36. The system of claim 35 wherein the controller comprises circuitry which is integrated with a surface on which at least one of the elements is disposed.

37. The system of claim 35 wherein the controller is further configured to scan the antenna in multiple patterns and detect a beam pattern of a signal carrying a response to the polling requests over the scanning of the antenna.

38. An antenna system for use in establishing and maintaining wireless data links, the system comprising:

an antenna system capable of selectively transmitting or receiving an electromagnetic signal in a plurality of directions; and

a controller coupled to the antenna system and configured to

send a signal to the antenna system to cause it to orient its gain in multiple directions,

transmit polling requests through the antenna system,

detect responses to the polling requests while the antenna system is oriented in at least two different directions,

determine a selected direction for the orientation of the gain of the antenna system based on the responses received while the antenna system was oriented in at least two different directions, and

transmit a direction control signal to the antenna system indicating the selected direction for the orientation of the gain of the antenna system.

39. The system of claim 38 wherein said antenna system comprises a plurality of elements and at least one of the plurality of elements is configured to transmit an electromagnetic signal in a different direction than another of the elements.

40. The system of claim 39 wherein at least one of the elements is capable of being activated while other elements are switched off to transmit the electromagnetic signal in the selected direction of transmission of the antenna system.