Arrangement comprising antenna elements

1. An arrangement comprising:

a first conductive antenna element comprising at least one first slot arranged in the first conductive antenna element; and

a second conductive antenna element comprising at least one second slot arranged in the second conductive antenna element;

wherein at least one second slot arranged in the second conductive antenna element is coupled with at least one first slot arranged in the first conductive antenna element by means of at least one conductor;

wherein each of the at least one first slot of the first conductive antenna element has at least one associated feed point arranged at the respective first slot, and each of the at least one second slot of the second conductive antenna element has at least one associated feed point arranged at the respective second slot, wherein the feed points are arranged to be fed with radio frequency signals having a selected wavelength or a wavelength within a selected wavelength range having a selected center wavelength;

wherein the first conductive antenna element is arranged above or below the second conductive antenna element and at a distance from the second conductive antenna element, wherein the distance is in a range from 0.15 times the selected wavelength or the selected center wavelength to 0.35 times the selected wavelength or the selected center wavelength.

2. An arrangement according to claim 1 , wherein at least one first slot arranged in the first conductive antenna element extends along a first axis and at least one second slot arranged in the second conductive antenna element extends along a second axis, wherein the first conductive antenna element and the second conductive antenna element are arranged with respect to each other such that the first axis and the second axis are parallel, or substantially parallel.

3. An arrangement according to claim 1 , wherein each of the first conductive antenna element and the second conductive antenna element is plate-shaped, or disc-shaped.

4. An arrangement according to claim 1 , wherein the at least one first slot of the first conductive antenna element and the at least one second slot of the second conductive antenna element are coupled with each other by means of a conductor having a length in a range from 0.15 times the selected wavelength or the selected center wavelength to 0.35 times the selected wavelength or the selected center wavelength.

5. An arrangement according to claim 1 , wherein at least one of the first conductive antenna element and the second conductive antenna element comprises a surface on which the at least one first slot or the at least one second slot, respectively, is arranged, wherein the surface has a perimeter at least in part defining an edge of the first conductive antenna element or the second conductive antenna element, respectively, and wherein the at least one first slot or the at least one second slot, respectively, is extending on the surface within the perimeter but without extending to the edge of the first conductive antenna element or the second conductive antenna element, respectively.

6. An arrangement according to claim 1 , wherein at least one of the first conductive antenna element and the second conductive antenna element comprises a surface on which the at least one first slot or the at least one second slot, respectively, is arranged, wherein the surface has a perimeter at least in part defining an edge of the first conductive antenna element or the second conductive antenna element, respectively, and wherein the at least one first slot or the at least one second slot, respectively, is extending from a point on the surface within the perimeter to the edge of the first conductive antenna element or the second conductive antenna element, respectively.

7. An arrangement according to claim 6 , wherein the at least one first slot or the at least one second slot, respectively, is non-planar.

8. An arrangement according to claim 6 , wherein the surface comprises a first planar surface portion and a second planar surface portion, wherein the first planar surface portion and second planar surface portion are adjoining each other, and wherein the first planar surface portion and the second planar surface portion are arranged in relation to each other such that the first planar surface portion is arranged at an angle to the second planar surface portion, or vice versa, wherein the at least one first slot or the at least one second slot, respectively, is extending across from the first planar surface portion to the second planar surface portion, or vice versa.

9. An arrangement according to claim 1 , wherein the first conductive antenna element comprises at least two first slots arranged in the first conductive antenna element and/or the second conductive antenna element comprises at least two second slots arranged in the second conductive antenna element;

wherein at least one of the first conductive antenna element and the second conductive antenna element comprises a surface on which the at least two first slots or the at least two second slots, respectively, are arranged, wherein the surface has a perimeter at least in part defining an edge of the first conductive antenna element or the second conductive antenna element, respectively, and wherein the at least two first slots or the at least two second slots, respectively, are extending on the surface within the perimeter but without extending to the edge of the first conductive antenna element or the second conductive antenna element, respectively; and

wherein at least two of the first slots or at least two of the second slots, respectively, are extending on the surface so as to intersect each other at least at one region on the surface.

10. An arrangement according to claim 1 , wherein each of the first conductive antenna element and the second conductive antenna element comprises a surface on which the at least one first slot and the at least one second slot, respectively, is arranged, wherein the surface has a perimeter at least in part defining an edge of the first conductive antenna element and the second conductive antenna element, respectively, and wherein the at least one first slot and the at least one second slot, respectively, is extending on the surface of the first conductive antenna element and the second conductive antenna element, respectively, within the respective perimeter but without extending to the edge of the first conductive antenna element and the second conductive antenna element, respectively, wherein the at least one first slot and the at least one second slot are coupled with each other by means of at least one conductor.

11. An arrangement according to claim 10 , wherein the at least one first slot and the at least one second slot are coupled with each other by means of at least one conductor extending between the at least one first slot at a midpoint along the length of the at least one first slot and the at least one second slot at a midpoint along the length of the at least one second slot.

12. An arrangement according to claim 1 , wherein the first conductive antenna element comprises at least two first slots arranged in the first conductive antenna element, wherein the first conductive antenna element comprises a surface on which the at least two first slots are arranged, wherein the surface has a perimeter at least in part defining an edge of the first conductive antenna element, and wherein the at least two first slots are extending on the surface within the perimeter but without extending to the edge of the first conductive antenna element, and wherein at least two of the first slots are extending on the surface so as to intersect each other at least at one region on the surface; and

wherein the second conductive antenna element comprises at least two second slots arranged in the second conductive antenna element, and wherein the second conductive antenna element comprises a surface on which the at least two second slots are arranged, wherein the surface has a perimeter at least in part defining an edge of the second conductive antenna element, and wherein each of the at least two second slots is extending from a point on the surface within the perimeter to the edge of the second conductive antenna element; and

wherein at least one of the at least two intersecting first slots is coupled with at least two of the second slots by means of respective ones of at least two conductors.

13. An arrangement according to claim 12 , wherein each of the at least two second slots is extending from a center point on the surface to the edge of the second conductive antenna element.

14. An arrangement according to claim 13 , wherein the at least two second slots are rotationally symmetrically arranged on the surface of the second conductive antenna element.

15. An arrangement according to claim 1 , wherein the at least one second slot arranged in the second conductive antenna element and/or the at least one first slot arranged in the first conductive antenna element comprises at least one indentation or groove.

16. An arrangement according to claim 1 , wherein one of the first conductive antenna element and the second conductive antenna element is a parasitic antenna element.

17. An antenna or antenna unit comprising or being constituted by at least one arrangement according to claim 1 .