Decoupling apparatus, radiation unit and antenna

1 . A radiation unit, comprising:

a radiation part configured to radiate electromagnetic power in a radiation direction;

a feeding part of a plate shape and comprising a decoupling apparatus, the decoupling apparatus comprising:

a body; and

a cross-finger portion coupled to the body and configured to change a capacitance of the decoupling apparatus, the cross-finger portion comprising:

a first plurality of fingers extending along a first direction; and

a second plurality of fingers extending along the first direction,

wherein at least one of the second plurality of fingers is provided between adjacent two fingers of the first plurality of fingers, and at least one of the first plurality of fingers is provided between adjacent two fingers of the second plurality of fingers; and

a base part configured to support and provide grounding for the feeding part.

2 . The radiation unit of claim 1 , wherein the decoupling apparatus further comprises:

a conductive line coupled to the cross-finger portion and extending along the first direction.

3 . The radiation unit of claim 2 , wherein the first and second plurality of fingers are coplanar provided on a first plane.

4 . The radiation unit of claim 3 , wherein the conductive line comprises:

a first line provided on the first plane and comprising a first end and a second end; and

a second line being parallel to the first line and comprising a third end and a fourth end.

5 . The radiation unit of claim 4 ,

wherein the second line is provided on a second plane parallel to the first plane; and

wherein the first end of the first line and the third end of the second line are connected by a first stud extending along a second direction perpendicular to the first direction; and wherein the second end of the first line and the fourth end of the second line are connected by a second stud extending along the second direction.

6 . The radiation unit of claim 4 ,

wherein the second line is provided on the first plane, and

wherein the conductive line further comprises a lateral line connecting the first end of the first line and the third end of the second line, and wherein the lateral line is provided on the first plane and forms a U shape with the first and second lines.

7 . The radiation unit of claim 1 , wherein the first plurality of fingers is provided on a third plane and the second plurality of fingers is provided on a fourth plane parallel to the third plane.

8 . The radiation unit of claim 1 , wherein each of the first plurality of fingers is separated from an adjacent finger of the second plurality of fingers along a third direction, the third direction being perpendicular to the first direction; and

wherein each of the second plurality of fingers is separated from an adjacent finger of the first plurality of fingers along the third direction.

9 . The radiation unit of claim 1 , wherein the decoupling apparatus is integrally formed.

10 . The radiation unit of claim 1 , wherein the decoupling apparatus is made of copper.

11 . The radiation unit of claim 1 , wherein:

the feeding part comprises a substrate having a first surface and a second surface opposite to the first surface along a second direction perpendicular to the first direction; and

the first plurality of fingers are provided on the first surface and the second plurality of fingers are provided on the second surface.

12 . The radiation unit of claim 1 , wherein:

the feeding part comprises a substrate having a first surface and a second surface opposite to the first surface along a second direction perpendicular to the first direction; and

the first and second plurality of fingers are coplanar and provided on the first surface.

13 . The radiation unit of claim 1 , wherein the decoupling apparatus further comprises a feeding line coupled to the body and adapted to transmit power from a power source to the radiation part.

14 . The radiation unit of claim 1 , wherein the radiation part comprises two pairs of radiation arms perpendicular to each other; and

wherein the feeding part comprises two substrates coupled to the respective radiation arm.

15 . An antenna comprising:

a radiation unit of claim 1 configured to radiate electromagnetic power in a first frequency range; and

a second radiation unit configured to radiate electromagnetic power in a second frequency range that is lower than the first frequency range.

16 . A radiation unit, comprising:

a radiation part comprising a plurality of radiation arms;

a feeding part that is coupled to the radiation part, the feeding part comprising a decoupling apparatus, the decoupling apparatus comprising:

a first metal plate having a plurality of first metal fingers extending therefrom; and

a second metal plate having a plurality of second metal fingers extending therefrom, where the first metal fingers are interleaved with the second metal fingers.

17 . The radiation unit of claim 16 , wherein the first metal plate, the second metal plate, the plurality of first metal fingers and the plurality of second metal fingers are all formed on a first surface of a substrate.

18 . The radiation unit of claim 17 , wherein the decoupling apparatus further comprises an inductive coupling line that electrically connects the first metal plate to the second metal plate.

19 . The radiation unit of claim 18 , wherein the inductive coupling line is formed solely on the first surface of the substrate.

20 . The radiation unit of claim 18 , wherein the inductive coupling line comprises a first portion that is formed on the first surface of the substrate and a second portion that is formed on a second surface of the substrate.