Antenna for sending and/or receiving electromagnetic signals
An antenna for sending and/or receiving electromagnetic signals and a method for using an antenna for sending and/or receiving electromagnetic signals. The antenna comprises an electrically conducting ground structure extending along a plane; a first structure forming a radiator, being electrically conducting; a second structure, being electrically conducting; and a feed point for connecting the antenna with a signal line. A first end of the first structure and a first end of the second structure are in electrical contact with each other at the feed point. Further, the ground structure is separated from the feed point by a gap and a second end of the second structure is connected to the ground structure. The second structure comprises a bending portion such that the second structure together with a portion of the ground structure surround an area when seen from a direction orthogonal to the plane of the ground structure.
1. An antenna for sending and/or receiving electromagnetic signals, comprising:
an electrically conducting ground structure extending along a plane;
a first structure forming a radiator, being electrically conducting;
a second structure, being electrically conducting; and
a feed point for connecting the antenna with a signal line;
wherein
a first end of the first structure and a first end of the second structure are in electrical contact with each other at the feed point,
the ground structure is separated from the feed point by a gap;
a second end of the second structure is connected to the ground structure;
the second structure comprises a bending portion such that the second structure together with a portion of the ground structure surround an area when seen from a direction orthogonal to the plane of the ground structure,
the first structure is substantially U-shaped, and
at least parts of the second structure are surrounded from three sides by the first structure.
2. The antenna according to claim 1 , wherein
the second structure comprises a first portion attached to the feed point extending away from the ground structure and a second portion attached to the ground structure extending away from the ground structure, wherein distal ends of the first and second portions are connected by the bending portion, and/or
the second structure and the ground structure form a loop with the gap between the feed point and the ground structure.
3. The antenna according to claim 1 , wherein
the antenna is a planar circuit antenna.
4. The antenna according to claim 1 , wherein
a shorter leg of the U-shaped first structure is connected with the feed point and a longer leg of the U-shaped radiator is open.
5. The antenna according to claim 1 , wherein
the feed point is a 50 Ohm feed point.
6. The antenna according to claim 1 , wherein
the first structure has a first portion, a second portion, and a third portion, wherein the second portion connects an end of the first portion with an end of the third portion;
an extension direction of the first portion of the first structure has a main component in a first direction in a plane parallel to the ground structure; and
an extension direction of the third portion has a main component in a second direction opposite to the first direction.
7. The antenna according to claim 6 , wherein
an extension direction of the second portion of the first structure has a main component in a direction perpendicular to the first and second directions.
8. The antenna according to claim 1 , wherein
the ground structure forms an edge in at least one of a ground plane of the signal line, a plane of the first structurer, or a plane of the second structure.
9. The antenna according to claim 1 , wherein
the first structure and the second structure are attached to a dielectric substrate.
10. The antenna according to claim 1 , wherein,
when seen from the direction orthogonal to the plane of the ground structure, the surrounding behind and in front of the first and/or the second structure is free from the ground structure and/or no ground structure is arranged behind or in front of the first and/or the second structure.
11. A method for using an antenna for sending and/or receiving electromagnetic signals comprising the step of:
connecting the antenna according to claim 1 to a signal processing unit.