Antenna(s) and electrochromic surface(s) apparatus and method

• US 6,703,981 B2
• Filed: 06/05/2002
• Issued: 03/09/2004
• Est. Priority Date: 06/05/2002
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Meitzler, William, Vonallmen, Paul
• Primary Examiner(s): Nguyen, Hoang V.
• Application Number:
  US10/164,330
• Publication Number:
  US 20030227416A1
• Time in Patent Office: 643 Days
• Field of Search: 343/712, 343/713, 343/755, 343/753, 343/909, 359/273, 359/603, 359/604, 340/550, 525/540
• US Class Current: 343/755
• CPC Class Codes: H01Q 19/06 using refracting or diffracting devices, e.g. lens radome H01Q1/42
• CPC Class Codes: H01Q 19/10 using reflecting surfaces

Abstract

One or more electrochromic surfaces (11) (formed on rigid or flexible carrier surfaces) are used in various ways with one or more radio frequency energy radiating elements (10) and/or guiding elements (91 and 120) to lend selective reflectivity to achieve greater resultant control over directionality, gain, phase, and/or shape of the radiated energy.

Claims

1. An apparatus comprising:

an antenna;

at least one electrochromic surface disposed proximal to the antenna wherein the at least one electrochromic surface has at least one operational mode comprising energizing the at least one electrochromic surface to cause the at least one electrochromic surface to become reflective to at least some radio frequency energy emissions to thereby cause at least part of the radio frequency emissions from the antenna to be reflected in a direction and thereby contribute to at least one null or peak of a radio frequency beam in a selected direction.

2. The apparatus of claim 1 wherein the at least one electrochromic surface includes electrochromic material disposed on a flexible carrier.

3. The apparatus of claim 2 wherein the flexible carrier is comprised of thin flexible plastic.

4. The apparatus of claim 3 wherein the thin flexible plastic is disposed over another surface such that the at least one electrochromic surface comprises a dielectric antenna reflector.

5. The apparatus of claim 1 wherein the at least one electrochromic surface includes

electrochromic material disposed on a substantially inflexible carrier.

6. The apparatus of claim 1 wherein the electrochromic surface selectively has at least two operational modes, comprising:

a first mode wherein the electrochromic surface is substantial transparent to radio frequency radiation from the antenna; and

a second mode wherein the electrochromic surface is at least substantially reflective of at least some incident radio frequency radiation from the antenna.

7. The apparatus of claim 6 and further comprising at least one of the electrochromic surfaces disposed proximal to the antenna.

8. The apparatus of claim 1 wherein radio frequency energy as emitted by the antenna is directed substantially away from the at least one electrochromic surface.

9. The apparatus of claim 1 wherein the at least one electrochromic surface is comprised of a doped conjugated polymer.

10. The apparatus of claim 9 wherein the doped conjugated polymer includes polyaniline doped with camphorsulfonic acid.

11. The apparatus of claim 10 wherein the doped conjugated polymer further includes a source of cations.

12. The apparatus of claim 11 wherein the source of cations comprises at least one of sodium, potassium, and lithium.

13. The apparatus of claim 1 wherein the at least one electrochromic surface is comprised of an oxide.

14. The apparatus of claim 13 wherein the oxide comprises an oxide of at least one of tungsten, molybdenum, and niobium.

15. The apparatus of claim 14 wherein the at least one electrochromic surface is further comprised of a source of cations.

16. The apparatus of claim 15 wherein the source of cations includes at least one of sodium, potassium, and lithium.

17. The apparatus of claim 1 wherein providing at least one electrochromic surface includes providing a surface that is substantially transparent to visible light.

18. The apparatus of claim 17 wherein the electrochromic surface that is substantially transparent to visible light includes indium tin oxide electrodes.

19. The apparatus of claim 1 and further comprising at least a second antenna disposed proximal to the at least one electrochromic surface.

20. The apparatus of claim 19 and further comprising a phasing directional antenna pattern controller operably coupled to the antenna and at least the second antenna.

21. The apparatus of claim 20 wherein the apparatus comprises a phased array beam-steerable antenna system.

22. The apparatus of claim 1 wherein the antenna comprises a parabolic surface and the at least one electrochromic surface comprises a part of a feedhorn disposed proximal to the parabolic surface.

23. The apparatus of claim 22 wherein a beam width as associated with the feedhorn varies dynamically at least in part as a function of the at least one electrochromic surface.

24. The apparatus of claim 22 wherein a phase taper as associated with the feedhorn varies dynamically at least in part as a function of the at least one electrochromic device.

25. The apparatus of claim 1 wherein the antenna comprises a monopole antenna.

26. The apparatus of claim 1 and further comprising a radio and counterpoise that are operably coupled to the antenna.

27. The method of claim 26 wherein the at least one electrochromic surface is disposed between the antenna and a counterpoise.

28. A method comprising:

providing an antenna;

sourcing radio frequency emissions at least in part using the antenna;

providing at least one electrochromic surface disposed proximal to the antenna;

energizing the at least one electrochromic surface to cause the at least one electrochromic surface to become reflective to at least some radio frequency energy emissions to thereby cause at least part of the radio frequency emissions from the antenna to be reflected in a direction and thereby contribute to at least one null or peak of a radio frequency beam in a selected direction.

29. The method of claim 28 wherein providing at least one electrochromic surface includes providing at least one electrochromic surface comprised at least in part of polyaniline material.

30. The method of claim 28 wherein providing at least one electrochromic surface includes providing at least one electrochromic surface comprised at least in part of a doped conjugated polymer.

31. The method of claim 30 wherein providing at least one electrochromic surface comprised at least in part of a doped conjugated polymer includes providing at least one electrochromic surface comprised at least in part of a polyaniline doped with camphorsulfonic acid.

32. The method of claim 31 wherein providing at least one electrochromic surface includes providing at least one electrochromic surface that includes a source of cations.

33. The method of claim 32 wherein providing at least one electrochromic surface that includes a source of cations includes providing at least one electrochromic surface that includes a source of cations such as at least one of sodium, potassium, and lithium.

34. The method of claim 28 wherein providing at least one electrochromic surface includes providing at least one electrochromic surface comprised at least in part of:

an oxide of at least one of tungsten, molybdenum, and niobium, and

a source of cations such as sodium, potassium, and lithium.

35. The apparatus of claim 28 wherein providing at least one electrochromic surface includes providing a substantially transparent electrochromic surface that includes indium tin oxide electrodes.

36. The method of claim 28 and further comprising at least a second electrochromic surface disposed proximal to the antenna.

37. The method of claim 36 and further comprising energizing the at least a second electrochromic surface to cause the at least one electrochromic surface to become reflective to at least some radio frequency energy emissions to thereby cause at least part of the radio frequency emissions from the antenna to be reflected in a direction and thereby contribute to at least one null or peak of a radio frequency beam in a selected direction.

38. The method of claim 28 and further comprising providing at least a second antenna disposed proximal to the at least one electrochromic surface.

39. The method of claim 38 and further comprising providing upmixed phase/magnitude/time controlled baseband signals and using both the at least one electrochromic surface and the upmixed phase/magnitude/time controlled baseband signals to control the beam.

40. The method of claim 38 and further comprising more narrowly defining the radio frequency beam using phasing.

41. A method comprising:

providing an antenna;

sourcing radio frequency emissions at least in part using the antenna;

providing a plurality of electrochromic surfaces disposed proximal to the antenna;

selectively energizing at least one of the electrochromic surfaces to cause the at least one electrochromic surface to become reflective to at least some radio frequency energy emissions to thereby cause at least part of the radio frequency emissions from the antenna to be reflected in a direction and thereby contribute to a radio frequency beam directed in a direction and thereby contribute to at least one null or peak of a radio frequency beam in a selected direction.

42. The method of claim 41 and further comprising providing a plurality of antennas and sourcing the radio frequency emissions at least in part using the plurality of antennas.

43. The method of claim 41 and further comprising providing upmixed phase/magnitude/time controlled baseband signals and using both the at least one electrochromic surface and the upmixed phase/magnitude/time controlled baseband signals to control the beam.

44. The method of claim 41 wherein the radio frequency beam is directed in a general direction using the electrochromic surfaces and in a more specific direction using phasing as between the plurality of antennas.

45. An apparatus comprising:

an antenna;

at least one electrochromic surface disposed proximal to the antenna, wherein at least one of electromagnetic field energy gain and phase as radiated by the antenna is influenced by the at least one electrochromic surface.

46. A waveguide system having a plurality of variable amplitude/phase controlling devices each comprising at least one electrochromic surface, wherein at least one of the electrochromic surfaces is operably controlled by a number of discrete bias voltages greater than two.

47. A method comprising:

providing a monopole antenna;

providing at least one electrochromic surface disposed proximal to the monopole antenna.

48. The method of claim 47 and further comprising using the at least one electrochromic surface as part of a counterpoise when tuning an impedance match with the antenna.

49. The method of claim 48 and further comprising tuning a center frequency of the antenna by selective activation of the at least one electrochromic surface.