Circular polarized array antenna
A circular polarized array antenna includes: groups of at least one set of patches for radiating and/or receiving a circular polarised electromagnetic wave; and a network of feeding lines, each feeding line being coupled to and extending longitudinally or vertically to one of the sets for transferring signal energy to and/or from the set. Each of the feeding lines coupled to the sets is pointing into a direction different from the pointing direction of the other feeding lines in order to achieve a circular orientation of the network of feeding lines.
1. A circular polarized array antenna comprising:
groups of at least one set of patches for radiating or receiving a circular polarised electromagnetic wave; and
a network of feeding lines, each feeding line being coupled to and extending longitudinally or vertically to one of the sets of patches for transferring signal energy to or from the set,
wherein each feeding line is pointing in a direction different from a pointing direction of other feeding lines in order to achieve a circular orientation of the network of feeding lines, two groups of adjacent feeding lines include a same angle between adjacent feeding lines, and the at least one set of patches includes three patches.
2. The array antenna according to claim 1 , wherein
an angle between the pointing directions of two adjacent feeding lines is equal to 360 degrees divided by a number of feeding lines.
3. The array antenna according to claim 1 , wherein
a phase between two adjacent feeding lines is equal to 360 degrees divided by a number of groups of feeding lines.
4. The array antenna according to claim 1 , wherein
the array antenna includes at least four sets of patches arranged in an quadratic 2×2 array.
5. The array antenna according to claim 4 , wherein
the angle between the pointing directions of two adjacent feeding lines is equal to 90 degrees.
6. The array antenna according to claim 4 , wherein
a phase between two adjacent feeding lines is equal to 90 degrees.
7. The array antenna according to claim 1 , wherein
at least one of the feeding lines is coupled to a central patch of the set of three patches.
8. The array antenna according to claim 1 , further comprising:
connection elements provided for connecting the three patches of the set of patches in order to enable transmission of signal energy between the patches.
9. The array antenna according to claim 8 , wherein
the connection elements are microstrip elements.
10. The array antenna according to claim 8 , wherein
the connection elements include discrete electric components.
11. The array antenna according to claim 1 , further comprising:
a dielectric superstrate provided on top of the at least one set of patches.
12. The array antenna according to claim 8 , wherein
the dielectric superstrate is a quarter-wavelength superstrate.
13. The array antenna according to claim 1 , wherein
at least two sets of patches are integrated into one piece.
14. The array antenna according to claim 1 , further comprising:
a horn antenna added to each set of patches in order to improve gain.
15. The array antenna according to claim 14 , wherein
at least a part of the horn is hollow.
16. The array antenna according to claim 14 , further comprising:
a slot provided between two horn antennas for suppressing surface waves.
17. The array antenna according to claim 16 , wherein the at least one set of patches includes at least one patch.
18. The array antenna according to claim 16 , wherein
an angle between the pointing directions of two adjacent feeding lines is equal to 360 degrees divided by a number of feeding lines.
19. The array antenna according to claim 16 , wherein
a phase between two adjacent feeding lines is equal to 360 degrees divided by a number of feeding lines.
20. The array antenna according to claim 16 , wherein
the array antenna includes at least four sets of patches arranged in an quadratic 2×2 array.
21. The array antenna according to claim 20 , wherein
the angle between the pointing directions of two adjacent feeding lines is equal to 90 degrees.
22. The array antenna according to claim 20 , wherein
a phase between two adjacent feeding lines is equal to 90 degrees.
23. The array antenna according to claim 16 , wherein
the at least one set of patches includes three patches.
24. The array antenna according to claim 23 , wherein
at least one of the feeding lines is coupled to the central patch of the set of three patches.
25. The array antenna according to claim 16 , further comprising:
connection elements provided for connecting patches of the set of patches in order to enable transmission of signal energy between the patches.
26. The array antenna according to claim 25 , wherein
the connection elements are microstrip elements.
27. The array antenna according to claim 25 , wherein
the connection elements include discrete electric components.
28. The array antenna according to claim 16 , further comprising:
a dielectric superstrate provided on top of the at least one set of patches.
29. The array antenna according to claim 16 , wherein
the dielectric superstrate is a quarter-wavelength superstrate.
30. The array antenna according to claim 16 , wherein
at least two sets of patches are integrated into one piece.
31. The array antenna according to claim 16 , further comprising:
a horn antenna added to each set of patches in order to improve gain.
32. The array antenna according to claim 31 , wherein
at least a part of the horn is hollow.
33. The array antenna according to claim 16 , wherein
each patch of the at least one set of patches has an orientation different from other patches of said at least one set of patches.
34. A mobile terminal comprising a circular polarized array antenna according to claim 16 .
35. The array antenna according to claim 1 , wherein
each patch of the at least one set of patches has an orientation different from other patches of said at least one set of patches.
36. A mobile terminal comprising a circular polarized array antenna according to any one of claims 1 – 16 , and 35 .
37. A method of making an array antenna that radiates or receives a circular polarized electromagnetic wave by groups of at least one set of patches, the method comprising the steps of
providing a network of feeding lines, each feeding line being coupled to and extending longitudinally or vertically to one of the sets of patches for transferring signal energy to or from the set,
arranged each feeding line so as to be coupled to a group of sets in such a way that each feeding line has a pointing direction different from a pointing direction of other feeding lines in order to achieve a circular orientation of the network of feeding lines,
arranging two groups of adjacent feeding lines in such a way that the two adjacent groups of feeding lines include a same angle between adjacent feeding lines, and
providing three patches for each set of patches.
38. The method according to claim 37 , further comprising:
providing an angle between the pointing directions of two adjacent feeding lines that is 360 degrees divided by a number of feeding lines.
39. The method according to claim 37 , further comprising:
providing a phase between two adjacent feeding lines that is 360 degrees divided by a number of feeding lines.
40. The method according to claim 37 , further comprising:
providing at least four sets of patches arranged in an quadratic 2×2 array.
41. The method according to claim 37 , further comprising:
providing an angle of 90 degrees between the pointing directions of two adjacent feeding lines.
42. The method according to claim 41 , further comprising:
providing a phase of 90 degrees between two adjacent feeding lines.
43. The method according to claim 37 , further comprising:
coupling one of the feeding lines to a central patch of the set of three patches.
44. The method according to claim 37 , further comprising:
providing connection elements for connecting the three patches of the set of patches in order to enable transmission of signal energy between the patches.
45. The method according to claim 44 , wherein
the connection elements are microstrip elements.
46. The method according to claim 45 , wherein
the connection elements include discrete electric components.
47. The method according to claim 37 , further comprising:
providing a dielectric superstrate on top of at least one patch.
48. The method according to claim 47 , wherein
the dielectric superstrate is a quarter-wavelength superstrate.
49. The method according to claim 37 , further comprising:
integrating at least two sets of patches into one piece.
50. The method according to claim 37 , further comprising:
adding a horn antenna to each set of patches in order to improve gain.
51. The method according to claim 50 , further comprising:
providing a slot between two horn antennas for suppressing surface waves.
52. The method according to claim 51 , wherein
at least a part of the horn is hollow.
53. The method according to claim 51 , further comprising:
providing at least one patch for a set.
54. The method according to claim 53 , further comprising:
providing an angle between the pointing directions of two adjacent feeding lines that is 360 degrees divided by a number of feeding lines.
55. The method according to claim 53 , further comprising:
providing a phase between two adjacent feeding lines that is 360 degrees divided by a number of feeding lines.
56. The method according to claim 53 , further comprising:
providing at least four sets of patches arranged in an quadratic 2×2 array.
57. The method according to claim 56 , further comprising:
providing an angle of 90 degrees between the pointing directions of two adjacent feeding lines.
58. The method according to claim 57 , further comprising:
providing a phase of 90 degrees between two adjacent feeding lines.
59. The method according to claim 53 , further comprising:
providing three patches for each set of patches.
60. The method according to claim 59 , further comprising:
coupling one of the feeding lines to a central patch of the set of three patches.
61. The method according to claim 53 , further comprising:
providing connection elements for connecting the patches of the set of patches in order to enable transmission of signal energy between the patches.
62. The method according to claim 61 , wherein
the connection elements are microstrip elements.
63. The method according to claim 61 , wherein
the connection elements include discrete electric components.
64. The method accroding to claim 53 , further comprising:
providing a dielectric superstrate on top of at least one patch in the at least one set of patches.
65. The method according to claim 64 , wherein
the dielectric superstrate is a quarter-wavelength superstrate.
66. The method according to claim 53 , further comprising:
integrating at least two sets of patches into one piece.
67. The method according to claim 53 , further comprising:
adding a horn antenna to each set of patches in order to improve gain.
68. The method according to claim 67 , wherein
at least a part of the horn is hollow.
69. A beam-switching array antenna comprising:
sets of at least one patch for radiating or receiving a circular polarised electromagnetic wave; and
horn antennas added to the sets in order to keep the same circular polarisation and increase gain,
wherein the horn antennas are arranged such that each horn antenna has a beaming direction different from a beaming direction of other horn antennas,
an axis of a central horn antenna is vertical and an axis of other horn antennas is tilted with respect to the axis of the central horn antenna, and
a greater amount that the other horn antennas are offset from the central horn antenna, a greater amount the axis of the other horn antennas is tilted with respect to the axis of the central horn antenna.
70. The method of making a beam-switching array antenna that radiates or receives a circular polarized electromagnetic wave by sets of at least one patch, the method comprising the steps of:
providing horn antennas to each one of the sets in order to keep the same circular polarisation and increase gain, and
arranging the horn antennas in such a way that each horn antenna has a beaming direction different from a beaming direction of the other groups of horn antennas, wherein
an axis of a central horn antenna is vertical and an axis of other horn antennas is tilted with respect to the axis of the central horn antenna, and
a greater amount that the other horn antennas are offset from the central horn antenna, a greater amount the axis of the other horn antennas is tilted with respect to the axis of the central horn antenna.