Antenna device and array antenna
View Patent ↗The present invention relates to a broadband non-resonant antenna device for wireless transmission of information using electromagnetic signals, comprising a metal sheet layer, forming a plane, with a slotline that comprises a first part and a second part. The side of the second part that is the most distant from the first part transcends into a widening open-ended tapered slot in the metal sheet layer. The device additionally comprises a feeding line in the metal sheet layer. The feeding line comprises a feeding part, with a first end and a second end, and gaps separating the feeding part from the surrounding metal sheet layer by a certain distance, where the slotline is intersected by the feeding line.
1. A broadband non-resonant antenna device for wireless transmission of information using electromagnetic signals, comprising a metal sheet layer, forming a plane, with a slotline that comprises a first part and a second part, where the side of the second part that is the most distant from the first part transcends into a widening open-ended tapered slot in the metal sheet layer, where the device additionally comprises a feeding line in the metal sheet layer, which feeding line comprises a feeding part, with a first end and a second end, and gaps separating the feeding part from the surrounding metal sheet layer by a certain distance, where the slotline is intersected by the feeding line wherein the antenna device is made from a sheet of metal, forming the metal sheet layer.
2. Antenna device according to claim 1 , wherein the feeding part divides the slotline into the first part and the second part of the slotline.
3. Antenna device according to claim 1 , wherein the first end of the feeding part is connected to the metal sheet layer after having intersected the slotline.
4. Antenna device according to claim 1 , wherein the tapered slot has an exponential form.
5. Antenna device according to claim 1 , wherein the side of the first part of the slotline that is the most distant from the second part transcends into an essentially two-dimensional cavity.
6. Antenna device according to claim 5 , wherein the essentially two-dimensional cavity has a circular form.
7. Antenna device according to claim 1 , wherein the side of the first part of the slotline that is the most distant from the second part is short-circuited to the metal sheet layer.
8. Antenna device according to claim 1 , wherein the first end of the feeding part is positioned past the slotline, with the gaps continuing at each of the sides of the feeding part.
9. Antenna device according to claim 8 , wherein the gaps are joined at the first end of the feeding part.
10. Antenna device according to claim 9 , wherein the joining part of the gaps, at the first end of the feeding part, forms an essentially two-dimensional cavity.
11. Antenna device according to claim 1 , wherein the second end of the feeding part extends to an edge of metal sheet layer.
12. Antenna device according to claim 1 , wherein an external feeding is attached to the second end of the feeding part.
13. Antenna device according to claim 1 , wherein a electrical contact is obtained between those ground planes that surround a centre conductor near the position where the centre conductor intersects the slotline.
14. Antenna device according to claim 13 , wherein said electrical contact is obtained by means of a metal bridge.
15. A broadband non-resonant array antenna comprising a plurality of similar antenna devices, for wireless transmission of information using electromagnetic signals, wherein at least one of the included antenna devices has the features described in claim 1 .
16. Array antenna according to claim 15 , wherein the antenna devices are positioned beside each other on the metal sheet layer.
17. Array antenna according to claim 16 , wherein a plurality of metal sheet layers, comprising the antenna devices positioned beside each other, are placed in a plurality of rows.
18. Array antenna according to claim 15 , wherein for each included antenna device, one orthogonally arranged antenna device is arranged.
19. Array antenna according to claim 15 , wherein a external feeding comprises at least one feeding module of an active or a passive type connected to at least one of the antenna devices.
20. Array antenna according to claim 19 , wherein the at least one feeding module comprises a variable phase-shifter and/or power attenuators.
21. Array antenna according to claim 19 , wherein the at least one feeding module may be connected to a control unit for power and phase control.
22. Array antenna according to claim 19 , wherein the at least one feeding module is electromagnetically coupled to at least one of the antenna devices.
23. Array antenna according to claim 19 , wherein the at least one feeding module is arranged to feed the at least one antenna device in such way that circular polarization is obtained.