Multi-frequency band antenna

• US 6,421,024 B1
• Filed: 01/05/2001
• Issued: 07/16/2002
• Est. Priority Date: 05/06/1999
• Status: Expired due to Term

• Current Assignee: Kathrein SE
• Original Assignee: Kathrein-Werke KG. (Kathrein SE)
• Inventors: Stolle, Manfred
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): NGUYEN, HOANG V
• Application Number:
  US09/743,092
• Time in Patent Office: 557 Days
• Field of Search: 343/790, 343/791, 343/792, 343/702, 343/793
• US Class Current: 343/792
• CPC Class Codes: H01P 5/16 Conjugate devices, i.e. devices having at least one port decoupled from one other port
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/25 Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 5/48 Combinations of two or more dipole type antennas
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407
• CPC Class Codes: H01Q 9/32 Vertical arrangement of element H01Q9/40 takes precedence

Abstract

A multiband antenna has a first antenna device for a first frequency band range and at least one second antenna device for a second frequency band range. The first antenna and the at least second antenna are arranged such that they are integrated and interleaved in one another. The associated dipole halves of the antennas are designed to be at least electrically in the form of, or similar to, sleeves or boxes. The dipole halves of the at least two antennas are short-circuited to one another at their respective mutually adjacent end, and extend from there with different lengths depending on the frequency band range to be transmitted. The dipole halves for transmitting the respectively lower frequency band range are located within the dipole halves which are intended for transmitting a respectively higher frequency or a respectively higher frequency band range.

Claims

1. A multiband antenna arrangement comprising:

a feed line arrangement,

at least a first antenna having a first operating frequency range, said first antenna including an inner dipole half that faces the feed line arrangement and an outer dipole half that faces away from the feed line arrangement,

at least a second antenna having a second operating frequency range higher than the first frequency range, said second antenna including an inner dipole half that faces the feed line arrangement and an outer dipole half that faces away from the feed line arrangement,

wherein;

the first antenna and the second antenna are integrated and interleaved with one another, with the first antenna dipole halves being disposed at least partially within the second antenna dipole halves,

the dipole halves are at least electrically in the form of sleeves or boxes,

the dipole halves have respective mutually adjacent inner ends that are short-circuited to one another, and

the dipole halves extend from said inner ends with lengths that are dependent on said operating frequency ranges.

2. The multiband antenna of claim 1, wherein the dipole halves are arranged coaxially with respect to one another.

3. The multiband antenna of claim 1, wherein the dipole halves are circular.

4. The multiband antenna of claim 1, wherein the dipole halves are polygonal.

5. The multiband antenna of claim 1, wherein the dipole halves are polygonal with n sides.

6. The multiband antenna of claim 1, wherein the dipole halves are oval in the cross section transverse with respect to the longitudinal extent thereof.

7. The multiband antenna of claim 1, further including an electrically conductive dipole wall for short-circuiting the dipole halves, the wall being closed in a circumferential direction transversely with respect to the longitudinal extent of said dipole halves.

8. The multiband antenna of claim 1, further including an electrically conductive dipole wall provided in the circumferential direction transversely with respect to the longitudinal extent of the dipole halves, said wall being broken down into a number of individual elements which are electrically short-circuited to one another at respective inner ends a corresponding dipole halves.

9. The multiband antenna of claim 1, wherein the feed line arrangement has a common connection that feeds the first and second antennas.

10. The multiband antenna of claim 1, wherein the feed line arrangement has a common coaxial line that feeds the first and second antennas.

11. The multiband antenna according to claim 10, wherein the coaxial line provides a mechanical support and holder for the multiband antenna, the coaxial line comprising a vertical tube.

12. The multiband antenna according to claim 10, wherein the coaxial line includes an outer conductor that feeds, mechanically supports and holds said dipole halves.

13. The multiband antenna of claim 1, wherein the feed line arrangement includes an inner conductor and an outer conductor, the inner conductor projecting at least slightly beyond the outer conductor, the inner conductor feeding plural dipole halves, said inner conductor including a projecting end that mechanically holds and supports said plural dipole halves.

14. The multiband antenna of claim 1 further including at least a third antenna integrated therein.

15. The multiband antenna of claim 14 wherein the third antenna comprises dipole halves comprising sleeves.

16. The multiband antenna of claim 14 wherein the third antenna has an innermost enclosure portion, and the feed line arrangement passes axially through the third antenna within the innermost enclosure portion thereof to extend to the first and second antennas.

17. The multiband antenna of claim 14 wherein the feed line arrangement comprises a multiple coaxial line having an outer coaxial conductor and an inner conductor, the third antenna having at least one dipole half in proximity to the feed line arrangement, the outer coaxial conductor being connected to a third antenna dipole half in proximity to the feed line, the inner conductor being connected to at least one further third antenna dipole half, the inner conductor providing an outer coaxial conductor for a further inner conductor, said further inner conductor feeding at least one of the first and second antennas.

18. The multiband antenna of claim 17 wherein the inner conductor extends from the third antenna and is connected to a said dipole half of the first antenna and a said dipole half of the second antenna.

19. The multiband antenna according to claim 17 wherein the feed line arrangement comprises at least one triax line having an outer coaxial line and an inner coaxial line, the outer coaxial line having an inner conductor that forms an outer coaxial conductor for the inner coaxial line.

20. The multiband antenna according to claim 14, wherein the feed line arrangement comprises a multiple coaxial feed line having 2 n lines which are electrically isolated from one another.

21. The multiband antenna according to claim 14 wherein the feed line arrangement comprises:

a multiple coaxial feed line having an outer conductor and an inner conductor,

a spur line branching off from the coaxial feed line, the spur line comprising at least inner and outer interleaved coaxial spur lines, the outer coaxial spur line having an electrical length corresponding to λ

₁/4, where λ

₁ corresponds to, or is matched to, the wavelength of the first frequency range, the inner coaxial spur line having an electrical length corresponding to λ

₂/4, where 2 corresponds to, or is matched to, the wavelength of the second frequency range,

the outer coaxial spur line having an outer conductor with an end, the inner coaxial spur line having an outer conductor with an end and also having an inner conductor, said outer coaxial spur line outer conductor end being short-circuited via a first short-circuit connection to the inner coaxial spur line outer conductor, the inner coaxial spur line outer conductor end being connected via a second short-circuit connection to the inner coaxial spur line inner conductor,

the outer coaxial spur line outer conductor being connected to the coaxial feed line outer conductor, the inner coaxial spur line inner conductor being electrically connected at a connecting point to the feed line inner conductor, and

the feed line arrangement being matched for at least the two operating frequency ranges.

22. The multiband antenna according to claim 21, wherein the inner and outer spur lines run transversely away from the coaxial feed line, and the antenna further includes a connecting point for routing the inner and outer spur lines.

23. The multiband antenna according to claim 22 wherein the inner and outer spur lines run transversely in an axial extension beyond the connecting point.

24. The multiband antenna according to claim 21, wherein the feed line arrangement comprises at least one triax line, and the inner spur line inner conductor comprises a coaxial feed which passes through the second short-circuit connection.

25. The multiband antenna according to claim 21, wherein the outer coaxial spur line outer conductor is electrically connected to the outer coaxial feed line outer conductor, and the inner spur line inner conductor forms the inner feed line outer conductor and is electrically connected at a connecting point to the outer feed line inner conductor.

26. The multiband antenna according to claim 21, wherein the first and second short-circuit connections comprise rings.

27. The multiband antenna according to claim 21, wherein the first and second short-circuit connections comprise sleeves.

28. The multiband antenna according to claim 21, wherein the electrical length of said first and second interleaved spur lines are dimensions in dependence on the first and second operating frequency ranges so as to electrically transform said short-circuit connections to electrical open circuit connections.

29. The multiband antenna according to claim 21, wherein the first short-circuit connection has a greater axial length than the second short-circuit connection.

30. The multiband antenna of claim 29 wherein the first short-circuit connection is located outside, and coaxially surrounds the second short-circuit connection.

31. The multiband antenna of claim 29 wherein the first short-circuit connection is located inside, and is coaxially surrounded bt the second short-circuit connection.

32. The multiband antenna according to claim 21, wherein the first and second short-circuit connections comprise sleeves that run radially with respect to, and are offset in the longitudinal direction of, the multiple coaxial feed line.

33. The multiband antenna of claim 1, wherein the feed line arrangement comprises an inner feed line, a connecting point, and an outer feed line having an inner conductor connected to the connecting point, the inner feed line running in a straight direction via the connecting point.

34. The multiband antenna of claim 1, wherein the feed line arrangement comprises:

a multiple coaxial line including at least one inner coaxial line having an inner conductor and an outer conductor, and at least one further axial outer conductor surrounding the inner coaxial line and having a connecting point defined thereon, and

a second coaxial connecting line having an inner conductor,

wherein said further axial outer conductor has an outlet opening, the second coaxial connecting line inner conductor being routed through said outlet opening to said connecting point.

35. The multiband antenna of claim 1, wherein the feedline arrangement comprises a multiple coaxial line having at least one inner conductor, at least one outer conductor, and a connection that connects said at least one inner conductor and said at least one outer conductor to the same potential.

36. The multiband antenna of claim 35 wherein said potential comprises ground potential .

37. The multiband antenna according to claim 35, wherein said connection comprises a broadband connection.

38. The multiband antenna according to claim 35, wherein said connection couples at least said two operating frequency ranges.

39. The multiband antenna of claim 35 wherein the feed line arrangement is match ed over a broadband for at least the first and second frequency ranges.

40. An antennas structure for use with a first frequency range and a second frequency band lower than said first frequency range, said antenna structure comprising:

a first antenna for use at the first frequency range, said first antenna including first and second dipole halves comprising sleeves,

a second antenna for use at the second frequency range, said second antenna comprising first and second dipole halves comprising sleeves,

the first and second antennas being arranged such that they are integrated and interleaved in one another, said second antenna dipole halves being disposed within said first antenna dipole halves,

at least some of the dipole halves being short-circuited at their respective mutually adjacent inner ends and extending therefrom with lengths dependent on the first and second frequency bands, respectively.

41. The antenna structure of claim 40 wherein said frequency ranges are in different frequency bands.