Multilevel antennae

• US 20050110688A1
• Filed: 10/12/2004
• Published: 05/26/2005
• Est. Priority Date: 09/20/1999
• Status: Active Grant

• Current Assignee: Fractus SA
• Original Assignee: Fractus SA
• Inventors: Soler Castany, Jordi, Baliarda, Carles Puente, Borja Borau, Carmen, Anguera Pros, Jaume
• Granted Patent: US 7,015,868 B2
• Time in Patent Office: Days
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• 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 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 5/10 Resonant antennas
• CPC Class Codes: H01Q 5/20 characterised by the operating wavebands
• CPC Class Codes: H01Q 5/307 Individual or coupled radiating elements, each element being fed in an unspecified way
• CPC Class Codes: H01Q 5/357 using a single feed point
• CPC Class Codes: H01Q 5/40 Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H01Q 9/04 Resonant antennas
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/065 Microstrip dipole antennas patch antenna H01Q9/0407
• 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 9/40 Element having extended radiating surface

Abstract

Antennae in which the corresponding radiative element contains at least one multilevel structure formed by a set of similar geometric elements (polygons or polyhedrons) electromagnetically coupled and grouped such that in the structure of the antenna can be identified each of the basic component elements. The design is such that it provides two important advantages: the antenna may operate simultaneously in several frequencies, and/or its size can be substantially reduced. Thus, a multiband radioelectric behaviour is achieved, that is, a similar behavior for different frequency bands.

Claims

1. An antenna including at least one multilevel structure wherein the multilevel structure comprises a set of polygonal or polyhedral elements having the same number of sides or faces, wherein each of said elements is electromagnetically coupled to at least one other of said elements either directly through at least one point of contact or through a small separation providing coupling, wherein for at least 75% of said polygonal or polyhedral elements, the region or area of contact between said polygonal or polyhedral elements is less than 50% of the perimeter or area of said elements, and wherein not all the polygonal or polyhedral elements have the same size.

2. The antenna according to claim 1 wherein the antenna is a multiband antenna.

3. The antenna according to claim 1, wherein said polygonal or polyhedral elements have at least two different shapes.

4. The antenna according to claim 1, wherein not all the regions or areas of contact between said polygonal or polyhedral elements have the same size.

5. The antenna according to claim 1, wherein the multilevel structure comprises at least four polygonal or polyhedral elements.

6. The antenna according to claim 1, wherein said at least one multilevel structure is formed only by triangles.

7. The antenna according to claim 1, wherein said at least one multilevel structure is formed by polygons of a single type, selected from the group consisting of four-sided polygons, pentagons, hexagons, heptagons, octagons, decagons, and dodecagons.

8. The antenna according to claim 1, wherein said at least one multilevel structure is formed only by circles.

9. The antenna according to claim 1, wherein said at least one multilevel structure is formed only by ellipses.

10. The antenna according to claim 1, wherein said at least one multilevel structure is formed only by polyhedrons.

11. The antenna according to claim 1, wherein said at least one multilevel structure is formed only by cylinders.

12. The antenna according to claim 1, wherein said at least one multilevel structure is formed only by cones.

13. The antenna according to claim 1, wherein said at least one multilevel structure is mounted in a monopole configuration.

14. The antenna according to claim 13, wherein said monopole is mounted substantially perpendicular to a ground plane.

15. The antenna according to claim 1, wherein said at least one multilevel structure is mounted substantially parallel to a ground plane in a patch antenna configuration.

16. The antenna according to claim 1, wherein said at least one multilevel structure forms at least one radiating element of a planar microstrip or patch structure having at least one parasitic element.

17. The antenna according to claim 1, wherein said at least one multilevel structure is included in at least one arm of a dipole configuration antenna.

18. The antenna according to claim 1, wherein said at least one multilevel structure forms part of the antenna in a substantially coplanar configuration with the ground plane.

19. The antenna according to claim 1, wherein said at least one multilevel structure forms at least one of the faces in a pyramidal horn.

20. The antenna according to claim 1, wherein said at least one multilevel structure or its perimeter form a cross-section of a conical or pyramidal horn antenna.

21. The antenna according to claim 1, wherein said at least one multilevel structure forms at least one loop.

22. The antenna according to claim 1, wherein said antenna is part of an array of antennas.

23. The antenna according to claim 1, wherein said at least one multilevel structure is constructed from a conducting, superconducting or dielectric material, or a combination thereof.

24. The antenna according to claim 1 or 2, wherein said antenna is being shared by several communication services or systems.

25. The antenna according to claim 1, wherein said antenna is used in at least one of the following systems selected from the group consisting of:

base stations of mobile telephony, communications terminals, vehicles, communications satellites and radar systems.

26. The antenna according to claim 1, wherein said antenna is a multiband or miniature resonator when said antenna radiates inefficiently.

27. The antenna according to claim 1 or 2, wherein said antenna includes an interconnection circuit that links the antenna to an input/output connector, and which is used to incorporate adaptation networks for impedances, filters or diplexers.

28. The antenna according to claim 1, wherein said at least one multilevel structure is loaded with capacitive or inductive elements to change at least one parameter of the antenna selected from the group consisting of its:

size, resonance frequency, radiation patterns and impedance.

29. The antenna according to claim 1, wherein said antenna comprises several multilevel structures, wherein each multilevel structure has the same number and shape polygon or polyhedron elements, the same arrangement and coupling between elements, and wherein said several multilevel structures are arranged in a manner similar to that of the arrangement of the polygonal or polyhedral elements that form one of the multilevel structures of said antenna.

30. The antenna according to claim 1, wherein said at least one multilevel structure comprises five triangles joined at their vertices, and forms an external perimeter having a triangular shape.

31. The antenna according to claim 1, wherein said at least one multilevel structure comprises five triangles joined at their vertices, and has an inductive loop at its top having a trapezoidal shape.

32. The antenna according to claim 1, wherein said at least one multilevel structure comprises a printed copper sheet on a printed circuit board.

33. The antenna according to any one of claims 1, 2, 5, 13, 15, or 16 wherein said antenna is included in a portable communications device.

34. The antenna according to claim 33, wherein said portable communications device is a handset.

35. The antenna according to claim 34, wherein said antenna operates at multiple frequency bands, and wherein at least one of said frequency bands is operating within the 800 MHz-3600 MHz frequency range.

36. The antenna according to claim 34, wherein said antenna operates at multiple frequency bands, and wherein at least one of said frequency bands is operating within the 890 MHz-3600 MHz frequency range.

37. The antenna according to claim 34, wherein the number of operating bands is proportional to the number of levels within said multilevel structure.

38. The antenna according to claim 2, wherein the number of operating bands is proportional to the number of levels within said multilevel structure.