Multi-part antenna having a circular polarization
View Patent ↗An antenna device has a first antenna branch and a second antenna branch. Both the first and the second antenna branches have the shape of a non-closed conductor loop and are connected to each other to form a cohesive conductor loop. The respective loop ends are disposed parallel to each other at a distance directed perpendicular (z axis) to the course of the loop. The antenna device has two connections that are disposed in the center section of the cohesive conductor loop at a distance from each other.
1. An antenna device, comprising:
a first antenna branch formed as a non-closed conductor loop;
a second antenna branch formed as a non-closed conductor loop and connected to said first antenna branch such that said second antenna branch continues the conductor loop formed by said first antenna branch and continuing a winding direction thereof;
said second antenna branch being disposed at a spacing distance transversely to the winding direction of the conductor loop adjacent to said first antenna branch;
a first feed point disposed on said first antenna branch; and
a second feed point disposed on said second antenna branch, said second feed point separated from said first feed point by a distance extending in the winding direction of the conductor low;
wherein an electrical length of a conductor loop formed by connecting said first antenna branch to said second antenna branch fulfills a resonance condition for an electromagnetic wave to be radiated;
wherein said first antenna branch and said second antenna branch form a double inverted F-antenna.
2. The antenna device according to claim 1 , wherein each of said first and second feed points is formed as a connector terminal.
3. The antenna device according to claim 1 , wherein said first and second feed points are configured as part of an HF coupler.
4. The antenna device according to claim 1 , wherein a shape of said first antenna branch substantially corresponds to a shape of said second antenna branch.
5. The antenna device according to claim 1 , wherein said first antenna branch is disposed relative to said second antenna branch such that a position of said first antenna branch substantially results from a 180° rotation of said second antenna branch about a given axis of symmetry.
6. The antenna device according to claim 1 , wherein said first and second antenna branches together define a parallelepiped hollow space.
7. The antenna device according to claim 6 , wherein said first and second antenna branches together define a cuboidal hollow space.
8. The antenna device according to claim 6 , wherein a loop end of said first antenna branch and a loop end of said second antenna branch each protrudes into one of the defining surfaces of said hollow space.
9. The antenna device according to claim 1 , wherein said first and second antenna branches together define a cylindrical hollow space.
10. The antenna device according to claim 9 , wherein each of said first antenna branch and said second antenna branch has a helical configuration.
11. The antenna device according to claim 1 , wherein said first and second antenna branches together define a hollow space having a shape of a half-pipe.
12. The antenna device according to claim 1 , wherein a spacing between said first antenna branch and said second antenna branch is substantially constant.
13. The antenna device according to claim 1 , wherein a spacing between said first antenna branch and said second antenna branch varies in a direction of the loop.
14. The antenna device according to claim 1 , wherein said first and second antenna branches are disposed with a spacing distance from one another in a direction parallel to the winding direction and forming a closed loop in a plan view.
15. A radio station, comprising:
an antenna device according to claim 2 ; and
an HF feed line electrically connected to said antenna device through said first and second feed points.
16. The radio station according to claim 15 , wherein a spacing between said first and second connector terminal is selected such that an impedance between said connectors in a range of the supplied frequency band corresponds to a source impedance of said HF feed line.
17. A radio station, comprising:
an antenna device according to claim 3 ; and
an HF feed line connected to said antenna device via an HF coupler.
18. The radio station according to claim 17 , wherein a spacing between said first and second feed points is selected so that an impedance therebetween within a range of the supplied frequency band corresponds to a source impedance of said HF feed line.
19. The antenna device according to claim 1 , further comprising a web connection connecting said first antenna branch and said second antenna branch together.
20. The antenna device according to claim 19 , wherein said web connection is located between said first feed point and said second feed point.