Tunable antenna having separate radiator parts and process for manufacturing it

• US 6,448,942 B2
• Filed: 12/26/2000
• Issued: 09/10/2002
• Est. Priority Date: 06/25/1998
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Schreiber, Michael, Weinberger, Martin
• Primary Examiner(s): PHAN, THO GIA
• Application Number:
  US09/748,322
• Publication Number:
  US 20010020921A1
• Time in Patent Office: 623 Days
• Field of Search: H01/Q.136, 343/745, 343/747, 343/748, 343/750, 343/895
• US Class Current: 343/895
• 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 1/362 for broadside radiating helical antennas
• CPC Class Codes: H01Q 11/08 Helical antennas
• CPC Class Codes: H01Q 9/14 Length of element or elements adjustable telescopic elements H01Q1/10
• CPC Class Codes: H01Q 9/145 by varying the electrical length

Abstract

A tunable antenna includes separate radiator parts coupled to one another. The coupling between the parts is changed by rotating and/or displacing the parts with respect to one another such that the antenna exhibits a radiation pattern associated with a respective degree of a rotation and/or displacement. A process for manufacturing such antennas includes constructing parts for a respective antenna, coupling the parts to one another to permit them to rotate and/or displace, measuring the radiation pattern of the parts, and adjusting the radiation pattern by rotating and/or displacing the parts with respect to one another to set a nominal radiation pattern of the respective antenna formed by the parts. The couple is changed by rotation and/or displacement of the parts. A respective degree of rotation and/or displacement creates a corresponding change of a radiation pattern of the parts.

Claims

1. A tunable antenna, comprising:

at least first and second separate radiator parts having an electrical coupling therebetween and defining a radiation pattern, said coupling formed to be changed by at least one of rotation and displacement of said at least first and second radiator parts with respect to one another where a respective degree of at least one of rotation and displacement creates a corresponding change said radiation pattern;

said first radiator part having a first helix and a first conductor part, said first helix having an end and a first longitudinal center axis and extending one of parallel and inclined to said first longitudinal center axis, said first conductor part being disposed at said end;

said second radiator part having a second helix and an second open turn, said second helix having an end and a second longitudinal center axis, said second open turn being disposed at said end and being disposed in a plane extending one of perpendicularly and inclined to said second longitudinal center axis of said helix; and

a third radiator part having a rod, a third conductor part, and a third open turn, said rod having a longitudinal center axis and first and second ends, said third conductor part being disposed at said first end and having a longitudinal center axis aligned with said longitudinal center axis of said rod, said third open turn being disposed at said second end and being located in a plane extending one of perpendicular and inclined to said longitudinal center axis of said rod.

2. The tunable antenna according to claim 1, including a cap for covering said at least first and second separate radiator parts.

3. The tunable antenna according to claim 1, wherein:

said first and second radiator parts are disposed with respect to one another to align said longitudinal center axes of said helices of said first and second radiator parts and such that said first conductor part electrically contacts said second open turn; and

at least one of said first and second radiator parts is formed to rotate about a respective longitudinal center axis of said helix.

4. The tunable antenna according to claim 3, wherein said at least first and second separate radiator parts is a plurality of first and second radiator parts disposed in an alternating sequence.

5. The tunable antenna according to claim 1, wherein said at least first and second separate radiator parts is a plurality of first and second radiator parts disposed in an alternating sequence.

6. The tunable antenna according to claim 1, wherein said first, second, and third radiator parts are disposed with respect to one another such that said longitudinal center axes of said helices of said first and second radiator parts are aligned, said longitudinal center axes of said rod and of said third conductor part extend one of parallel and inclined to said longitudinal center axes of said helices of said first and second radiator parts, said first conductor part electrically contacts said third open turn, said third conductor part electrically contacts said second open turn, and at least one of said first, second, and third radiator parts is formed to be rotated about said longitudinal center axes of said helices of said first and second radiator parts.

7. The tunable antenna according to claim 6, wherein said first, second, and third radiator parts are a plurality of first, second, and third radiator parts disposed such that respective longitudinal center axes of said helices of said first and second radiator parts are aligned, said respective longitudinal center axes of said rod and of said third conductor part extend one of parallel and inclined to said longitudinal center axes of said helices of said first and second radiator parts, a conductor part of one of said first, second and third radiator parts electrically contacts an open turn of an adjoining conductor part of one of said first, second and third radiator parts, and at least one of said first, second and third radiator parts is formed to be rotated about said longitudinal center axes of said helices of said first and second radiator parts.

8. The tunable antenna according to claim 1, wherein said couple is a capacitive coupling.

9. The tunable antenna according to claim 1, wherein said electrical coupling is an inductive coupling.

10. The tunable antenna according to claim 1, wherein:

said first and second radiator parts are disposed with respect to one another such that said first and second longitudinal center axes are aligned;

said first and second radiator parts at least one of overlap one another in a direction of said first and second longitudinal center axes and are opposite one another at a predetermined distance; and

at least one of said first and second radiator parts is formed to be displaced along said first and second longitudinal center axes such that at least one of an overlap area and said distance between said first and second radiator parts is changed with a degree of displacement.

11. The tunable antenna according to claim 10, wherein said first and second helices have one of identical and different pitches.

12. The tunable antenna according to claim 10, wherein said first and second helices have one of identical and different diameters.

13. The tunable antenna according to claim 10, wherein said first and second helices have one of equal and oppositely directed pitches.

14. The tunable antenna according to claim 1, wherein said at least first and second radiator parts are applied to respective carriers.

15. The tunable antenna according to claim 14, wherein said respective carriers are at least one of round and angular.

16. The tunable antenna according to claim 1, wherein said at least first and second radiator parts are manufactured in MID technology.

17. The tunable antenna according to claim 1, wherein said at least first and second radiator parts are fixed with respect to one another after being set to a desired radiation pattern.

18. The tunable antenna according to claim 1, wherein said first, second, and third radiator parts are fixed with respect to one another after being set to a desired radiation pattern.

19. The tunable antenna according to claim 1, wherein said first and second helices have one of identical and different pitches.

20. The tunable antenna according to claim 1, wherein said first and second helices have one of identical and different diameters.

21. The tunable antenna according to claim 1, wherein said first and second helices have one of equal and oppositely directed pitches.

22. A tunable antenna, comprising:

at least first and second separate radiator parts having a capacitive coupling therebetween and defining a radiation pattern, said coupling formed to be changed by at least one of rotation and displacement of said at least first and second radiator parts with respect to one another where a respective degree of at least one of rotation and displacement creates a corresponding change said radiation pattern;

said first radiator part having a first helix and a first plate part, said first helix having an end and a first longitudinal center axis, said first plate part being disposed at said end and being disposed in a plane extending one of perpendicular and inclined to said longitudinal center axis of said first helix; and

said second radiator part having a second helix and a second plate part, said second helix having an end and a second longitudinal center axis, said second plate part being disposed at said end of said second helix and being disposed in a plane extending one of perpendicular and inclined to said second longitudinal center axis.

23. The tunable antenna according to claim 22, wherein said first and second radiator parts are disposed with respect to one another such that said first and second longitudinal center axes are aligned and said first plate part is opposite said second plate part at a predetermined distance, and at least one of said first and second radiator parts is formed to be rotated about said first and second longitudinal center axes such that an area of coverage of said first and second plate parts is changed with a respective degree of rotation.

24. The tunable antenna according to claim 22, in which said first and second plate parts are disc segments.

25. The tunable antenna according to claim 22, wherein said first and second helices have one of identical and different pitches.

26. The tunable antenna according to claim 22, wherein said first and second helices have one of identical and different diameters.

27. The tunable antenna according to claim 22, wherein said first and second helices have one of equal and oppositely directed pitches.

28. A tunable antenna, comprising:

at least first and second separate radiator parts having an inductive coupling therebetween and defining a radiation pattern, said coupling formed to be changed by at least one of rotation and displacement of said at least first and second radiator parts with respect to one another where a respective degree of at least one of rotation and displacement creates a corresponding change said radiation pattern;

said first radiator part having a first helix and a first meander-shaped part, said first helix having a first longitudinal center axis;

said second radiator part having a second helix and a second meander-shaped part, said second helix having a second longitudinal center axis;

said first and second radiator parts being disposed with respect to one another such that said first and second longitudinal center axes are aligned and said first meander-shaped part contacts said second meander-shaped part; and

at least one of said first and second radiator parts being formed to be rotated about said first and second longitudinal center axes such that an inductance formed by said first and second meander-shaped parts is changed with a degree of rotation.

29. The tunable antenna according to claim 28, wherein at least one of said first and second meander-shaped parts is a radiating part.

30. The tunable antenna according to claim 28, wherein said first and second helices have one of identical and different pitches.

31. The tunable antenna according to claim 28, wherein said first and second helices have one of identical and different diameters.

32. The tunable antenna according to claim 28, wherein said first and second helices have one of equal and oppositely directed pitches.