Slot mode antennas
The invention concerns an assembly for an antenna operating in a slot mode. It is also directed to an electronic wristwatch-like device comprising such antennas. The antenna assembly comprises at least one circuit board of an electronic device, a conductive body arranged at a distance from said at least one circuit board and defining a slot between them, at least one feed element for coupling an electromagnetic signal between said conductive body and said circuit board. A length of the slot is defined between two points at which said conductive body is connected to a ground plane of said at least one circuit board.
1. An assembly for an antenna operating in a slot mode, wherein the assembly comprises
at least one printed circuit board of an electronic wristwatch-like device,
a conductive body arranged at a distance from said at least one printed circuit board and defining a slot mode antenna between them, wherein the conductive body is a bezel being a part of a housing encompassing the electronic wristwatch-like device,
said antenna having two end connection points at which said bezel is connected to a ground plane of said at least one circuit board, and between said connection points at the edge of one of said at least one printed circuit board is at least one feed element for coupling an electromagnetic signal between said slot mode antenna and said circuit board, and
wherein the effective width and/or length of the slot mode antenna is at least partially defined by a conductive rim structure running at least in part along the perimeter of said one printed circuit board and attached to the edge of said board.
2. The assembly according to claim 1 , wherein said circuit board is arranged in a plane parallel to and at least partly aligned with said bezel, and wherein said circuit board has at least along a part of the periphery of the board a conductive layer at said ground plane.
3. The assembly according to claim 1 , further comprising an element having a connection point that connects said bezel to a ground plane of said circuit board, said connection point being located at a first end of said slot forming said slot mode antenna.
4. The assembly according to claim 1 , further comprising an element having a connection point that connects said bezel to a ground plane of said circuit board, said connection point being located at a second end of said slot forming said slot mode antenna.
5. The assembly according to claim 1 , wherein said element for said first and second connection points are separate and located at the first and second ends of said slot which defines the length of the slot mode antenna.
6. The assembly according to claim 1 , wherein said first and second connection points and at least one feed element in said wristwatch-like device is positioned approximately between 3 and 9 o'clock along the periphery of the device.
7. The assembly according to claim 1 , wherein said bezel has the shape of a ring, an ellipse, a rectangle, a square, or any other polygon.
8. The assembly according to claim 1 , further comprising more than two connecting points.
9. The assembly according to claim 8 , wherein said circuit board and said bezel are arranged to define multiple slots between them, each slot being defined between two connecting points and each slot having at least one feed element between said connecting points.
10. The assembly according to claim 1 , wherein said conductive rim structure is at least in part forming an extension of the periphery of said one printed circuit board.
11. The assembly according to claim 1 , wherein at least one slot in the assembly is adapted for the reception of a GNSS (Global Navigation Satellite System) signal.
12. The assembly according to claim 11 , wherein said GNSS signal is selected from GPS, Glonass, Galileo and/or Beidou signals.
13. An electronic wristwatch-like device comprising
a housing,
at least one printed circuit board inside said housing,
a conductive bezel arranged at a distance from said printed circuit board as part of said housing and defining a slot between them,
wherein the slot comprises an antenna operating in a slot mode having two end connecting points at which said bezel is connected to a ground plane of said at least one printed circuit board, and between said connection points at the edge of one of said at least one printed circuit board at least one feed element for coupling an electromagnetic signal between said slot mode antenna and said circuit board, and
wherein said wristwatch-like device further comprises a conductive rim structure running at least in part along the perimeter of said one printed circuit board and attached to the edge of said board, with which the effective width and/or length of the slot mode antenna at least partially is defined,
wherein said circuit board is arranged in a plane parallel to and at least partly aligned with said conductive bezel.
14. The device according to claim 13 , wherein said circuit board has at least along a part of the periphery of said circuit board a conductive layer at said ground plane.
15. The device according to claim 13 , further comprising an element having a connection point that connects said conductive body to a ground plane of said circuit board, said connection point being located at a first end of said slot forming said slot mode antenna.
16. The device according to claim 13 , further comprising an element having a connection point that connects said conductive body to a ground plane of said circuit board, said connection point being located at a second end of said slot forming said slot mode antenna.
17. The device according to claim 13 , wherein said element for said first and second connection points are separate and located at the first and second ends of said slot which defines the length of the slot mode antenna.
18. The device according to claim 13 , wherein said first and second connection points and said at least one feed element are positioned approximately between 3 and 9 o'clock along the periphery of the device.
19. The device according to claim 13 , wherein said conductive bezel has the shape of a ring, an ellipse, a rectangle, a square, or any other polygon.
20. The device according to claim 13 , wherein said slot mode antenna comprises more than two connecting points.
21. The device according to claim 13 , wherein said circuit board and said conductive bezel are arranged to define multiple slots between them, each slot being defined between two connecting points and each slot having at least one feed element between said connecting points.
22. The device according to claim 13 , wherein said conductive rim structure is at least in part forming an extension of the periphery of said one printed circuit board.
23. The device according to claim 13 , wherein at least one slot in the device is adapted for the reception of a GNSS (Global Navigation Satellite System) signal.
24. The device according to claim 23 , wherein said GNSS signal is selected from GPS, Glonass, Galileo and/or Beidou signals.
25. The assembly according to claim 1 , wherein the at least one feed element is directly connected to the at least one circuit board.