Non-multiple delay element values for phase shifting

• US 20050242993A1
• Filed: 04/29/2004
• Published: 11/03/2005
• Est. Priority Date: 04/29/2004
• Status: Active Grant

• Current Assignee: L-3 Communications Integrated Systems LP (L3Harris Technologies, Inc.)
• Original Assignee: L-3 Communications Integrated Systems LP (L3Harris Technologies, Inc.)
• Inventors: Hein, Paul Walton
• Granted Patent: US 7,205,937 B2
• Time in Patent Office: Days
• US Class Current: 342/375
• CPC Class Codes: H01Q 3/22 varying the orientation in accordance with variation of frequency of radiated wave

Abstract

Non-multiple delay element values that may be implemented to reduce periodic quantization errors associated with phase shifting devices used in phased array apparatus. The non-multiple delay element values may be implemented so that a magnitude of phase shift imparted by a given delay element of a phase shifting scheme is not a multiple or a factor of the magnitude of the phase shift imparted by any other delay element employed in the same phase shifting scheme.

Claims

1. A phase shifting device configured to receive and change the phase of a signal, said phase shifting device comprising at least two transmission line delay elements, said at least two transmission line delay elements comprising a first transmission line delay element and a second transmission line delay element configured to be coupled to said signal, and wherein the magnitude of a phase shift imparted to said signal by said first transmission line delay element is not a multiple or a factor of the magnitude of a phase shift imparted to said signal by said second transmission line delay element.

2. The phase shifting device of claim 1, wherein said first and second transmission line delay elements are coupled together in series with said signal.

3. The phase shifting device of claim 1, wherein said first and second transmission line delay elements are configured to be selectably coupled together in series with said signal.

4. The phase shifting device of claim 1, wherein the magnitude of a phase shift imparted to said signal by said first delay transmission line bit is distributed relative to the magnitude of a phase shift imparted to said signal by said second transmission line delay element based on a prime number-based factor.

5. The phase shifting device of claim 1, wherein the magnitude of a phase shift imparted to said signal by said first transmission line delay element is distributed relative to the magnitude of a phase shift imparted to said signal by said second delay transmission line bit based on a non-integer factor.

6. The phase shifting device of claim 1, wherein the magnitude of a phase shift imparted to said signal by said first transmission line delay element is not a multiple or a factor of the magnitude of a phase shift imparted to said signal by any other transmission line delay element of said phase shifting device.

7. The phased shifting device of claim 1, wherein said signal comprises a radio frequency signal, a radar signal, a sonar signal, a seismic signal or an ultrasonic signal.

8. The phase shifting device of claim 1, wherein said signal comprises a radio frequency signal.

9. A phased array apparatus, comprising:

a plurality of array elements; and

a plurality of phase shifting devices, each of said plurality of phase shifting devices being coupled to a respective one of said plurality of array elements;

wherein each of said plurality of phase shifting devices is configured to vary the phase of a signal transmitted or received by each respective one of said array elements by a delay value that is non-multiple relative to the delay value of the other of said plurality of phase shifting devices.

10. The phased array apparatus of claim 9, wherein each of said plurality of phase shifting devices comprises at least two transmission line delay elements configured to be selectably coupled together in series with said respective one of said plurality of array elements to independently vary the phase of a signal transmitted or received by said respective one of said array elements;

and wherein at least one of said transmission line delay elements has a delay element value that is non-multiple relative to a delay element value of at least one other of said transmission line delay elements.

11. The phased array apparatus of claim 10, wherein each of said transmission line delay elements has a delay element value that is non-multiple relative to all other of said transmission line delay elements.

12. The phased array apparatus of claim 11, wherein at least one of said transmission line delay elements has a delay element value that is distributed relative to a delay element value of at least one other of said transmission line delay elements based on a prime number-based factor.

13. The phased array apparatus of claim 11, wherein at least one of said delay elements has a transmission line delay element value that is distributed relative to a delay element value of at least one other of said transmission line delay elements based on a non-integer factor.

14. The phased array apparatus of claim 11, wherein said phased array apparatus comprises a radio frequency antenna.

15. The phased array apparatus of claim 11, wherein said phased array apparatus comprises a radio frequency antenna array, a sonar array, a seismic array, an ultrasonic array, or a radar array.

16. The phased array apparatus of claim 14, wherein said phased array apparatus is configured for transmitting or receiving signals having a frequency bandwidth of greater than or equal to about 2:

1.

17. A phased array antenna system, comprising:

a plurality of antenna elements forming an antenna array; and

a plurality of phase shifting devices, each of said plurality of phase shifting devices being coupled to at least a respective one of said plurality of antenna elements;

wherein each of said plurality of phase shifting devices comprises at least two transmission line delay elements configured to be selectably coupled together in series with said respective one of said plurality of array elements to independently vary the phase of a radio frequency signal transmitted or received by said respective one of said array elements; and

wherein at least one of said transmission line delay elements of each of said phase shifting devices has a delay element value that is non-multiple relative to a delay element value of at least one other of said transmission delay elements of the same phase shifting device.

18. The phased array antenna system of claim 17, wherein each of said transmission line delay elements has a delay element value that is non-multiple relative to all other of said transmission line delay elements.

19. The phased array antenna system of claim 18, wherein at least one of said transmission line delay elements has a delay element value that is distributed relative to a delay element value of at least one other of said transmission line delay elements based on a prime number-based factor.

20. The phased array antenna system of claim 18, wherein at least one of said delay elements has a transmission line delay element value that is distributed relative to a delay element value of at least one other of said transmission line delay elements based on a non-integer factor.

21. The phased array apparatus of claim 17, wherein said phased array antenna system is configured for transmitting or receiving radio frequency signals having a frequency bandwidth of greater than or equal to about 2:

1.

22. The phased array antenna system of claim 18, wherein said phased array system further comprises a signal divider, signal combiner, or a signal divider/combiner coupled to each of said amplifiers;

and at least one of a receiver, transmitter, or a transceiver coupled to said signal divider, signal combiner, or a signal divider/combiner.

23. The phased array antenna system of claim 22, wherein said phased array antenna system further comprises an amplifier coupled between each of said phase shifting devices and said signal combiner, signal divider, or signal divider/combiner.

24. The phased array antenna system of claim 18, wherein each of said phase shifting devices is configured to independently vary the phase of a radio frequency signal transmitted or received by said respective antenna element coupled to said phase shifting device in response to a digital control signal received by said phase shifting device.

25. The phased array antenna system of claim 18, wherein each of said phase shifting devices is coupled to a respective group of said antenna elements to independently vary the phase of a radio frequency signal transmitted or received by said respective group of said antenna elements.

26. The phased array antenna system of claim 18, wherein said phased array antenna system is configured for use as part of a tactical reconnaissance system.

27. A method of shifting the phase of a signal, comprising:

receiving a signal having a first phase in a phase shifting device comprising at least a first transmission line delay element and a second transmission line delay element;

shifting the phase of said received signal by a first phase shift magnitude relative to said first phase in said first transmission line delay element to form a signal having a second phase different than said first phase; and

subsequently shifting the phase of said signal having a second phase by a second phase shift magnitude in said second transmission line delay element to form a signal having a third phase different than said first or second phases;

wherein said first phase shift magnitude is not a multiple or a factor of said second phase shift magnitude.

28. The method of claim 27, wherein said first and second transmission line delay elements are configured to be selectably coupled together in series with said signal.

29. The method of claim 27, wherein said first phase shift magnitude is distributed relative to said second phase shift magnitude based on a prime number-based factor.

30. The method of claim 29, wherein said method further comprises selecting said prime number-based factor to have a value that is within about 10% of the value of a binary multiple factor.

31. The method of claim 27, wherein said first phase shift magnitude is distributed relative to said second phase shift magnitude based on a non-integer factor.

32. The method of claim 27, wherein said first phase shift magnitude and said second phase shift magnitude are not multiples or factors of the magnitude of a phase shift imparted by any other delay element of said phase shifting device.

33. The method of claim 32, wherein said phase shifting device comprises a part of a phased array apparatus that comprises a plurality of array elements and a plurality of phase shifting devices, each of said plurality of phase shifting devices being coupled to a respective one of said plurality of array elements.

34. The method of claim 33, wherein said signal comprises a radio frequency signal, a radar signal, a sonar signal, a seismic signal or an ultrasonic signal.

35. The method of claim 33, wherein said signal comprises a radio frequency signal.

36. The method of claim 35, wherein said signal comprises a radio frequency signal having a frequency bandwidth of greater than or equal to about 2:

1.

37. A method of operating a phased array apparatus, comprising:

providing a plurality of array elements;

providing a plurality of phase shifting devices, each of said plurality of phase shifting devices being coupled to a respective one of said plurality of array elements; and

varying the phase of a signal transmitted or received by each respective one of said array elements by a delay value that is non-multiple relative to the delay value of the other of said plurality of phase shifting devices.

38. The method of claim 37, wherein each of said plurality of phase shifting devices comprises at least two transmission line delay elements configured to be selectably coupled together in series with said respective one of said plurality of array elements to independently vary the phase of a signal transmitted or received by said respective one of said array elements;

and wherein at least one of said transmission line delay elements has a delay element value that is non-multiple relative to a delay element value of at least one other of said transmission line delay elements.

39. The method of claim 38, wherein said signal comprises a radio frequency signal;

and wherein said method further comprises operating said phased array antenna apparatus as part of a tactical reconnaissance system.

40. The method of claim 39, wherein said signal comprises a radio frequency signal having a frequency bandwidth of greater than or equal to about 2:

1.