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1. WO2016097712 - ANTENNE MULTI-FONCTION MULTI-BANDE RECONFIGURABLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A reconfigurable antenna device comprising a substrate incorporating a groundplane, a chassis antenna mounted at an end of the groundplane and configured to excite first radiating modes in the groundplane, and a balanced loop antenna mounted at the end of the groundplane adjacent to the chassis antenna and configured to excite second radiating modes, wherein the first and second radiating modes are substantially orthogonal to each other.

2. An antenna device as claimed in claim 1 , wherein an active coaxial feed is integrated into one side of the balanced loop antenna, and wherein a dummy coaxial feed is integrated into the other side of the balanced loop antenna so as to preserve symmetry of the balanced loop antenna.

3. An antenna device as claimed in any preceding claim, wherein the second radiating modes are balanced radiating modes.

4. An antenna device as claimed in any preceding claim, wherein the chassis antenna and the loop antenna are integrated with each other.

5. An antenna device as claimed in any preceding claim, wherein the geometry of the groundplane is symmetric about an axis in the plane, and wherein the antennas are arranged to be substantially symmetric about the axis.

6. An antenna device as claimed in any preceding claim, wherein the balanced loop antenna is fed by way of a balun.

7. An antenna device as claimed in any preceding claim, wherein the balanced loop antenna is configured such that it can be fed by way of a balun at some frequencies or frequency bands and without a balun at other frequencies or frequency bands.

8. An antenna device as claimed in any preceding claim, wherein the chassis antenna comprises an elongate conductive strip with a feeding point substantially at the centre of the strip.

9. An antenna device as claimed in any preceding claim, wherein each end of the chassis antenna is capacitively and/or inductively loaded.

10. An antenna device as claimed in any preceding claim, wherein the chassis antenna and the loop antenna are both mounted at an end edge of the groundplane.

1 1. An antenna device as claimed in claim 10, wherein the end edge of the groundplane is provided with a first groundplane extension in the form of a small, conductive metal sheet projecting from the edge of the groundplane and electrically connected thereto.

12. An antenna device as claimed in claim 11 , wherein the first groundplane extension serves as the feeding point for the chassis antenna.

13. An antenna device as claimed in claim 11 or 12, wherein the first groundplane extension is disposed substantially centrally on the end edge of the groundplane.

14. An antenna device as claimed in any one of claims 10 to 13, wherein there is further provided second and third groundplane extensions, also in the form of small, conductive metal sheets electrically connected to the groundplane.

15. An antenna device as claimed in claim 14, wherein the second and third groundplane extensions are located in a plane parallel to but slightly above or below the plane of the groundplane and/or the plane of the first groundplane extension.

16. An antenna device as claimed in claim 14 or 15, wherein the second and third groundplane extensions serve at the feeding points for the balanced loop antenna.

17. An antenna device as claimed in any preceding claim, wherein lumped elements, such as capacitors and inductors, are integrated into one or both of the chassis antenna and the balanced loop antenna.

18. An antenna device as claimed in any preceding claim, wherein the chassis antenna and the balanced loop antenna are each connected to respective signal ports by way of matching circuitry so as to match the impedances of the chassis antenna and the balanced loop antenna.

19. An antenna device as claimed in claim 18, wherein the matching circuitry comprises an impedance transformer connected in series with a matching circuit between the respective antenna and its signal port.

20. An antenna device as claimed in claim 19, wherein the matching circuit comprises first and second matching circuits connected in parallel, with an inductor connected in series with the first matching circuit and a capacitor connected in series with the second matching circuit.

21. An antenna device as claimed in any one of claims 18 to 20, wherein the matching circuitry comprises at least two branches between the respective antenna and its signal port, each branch comprising a transformer and a pair of matching circuits connected in parallel.

22. An antenna device as claimed in claim 22, wherein switches are provided so as to isolate one or other of the at least two branches.

23. An antenna device as claimed in any one of claims 18 to 22 depending through claim 6, wherein the matching circuitry between the balanced loop antenna and its signal port comprises at least one impedance transformer connected in series with a matching circuit and a balun, optionally with switches to allow the components to be isolated.

24. An antenna device as claimed in claim 23, wherein the matching circuitry between the balanced loop antenna and its signal port comprises at least two parallel branches, each branch comprising an impedance transformer, a matching circuit and a balun connected in series.

25. An antenna device as claimed in claim 24, wherein the impedance transformer and matching circuit in each branch is optimised for a different frequency band, and wherein the required branch or branches can be actively switched in or out as required so as to switch the working frequency band.

26. An antenna device as claimed in any preceding claim, wherein one or more of the chassis antenna, balanced loop antenna and the groundplane is or are provided with one or more respective tuning branches.

27. An antenna device as claimed in any preceding claim, wherein there is further provided first and second additional antennas.

28. An antenna device as claimed in claim 27 depending through claim 10, wherein the first and second additional antennas are disposed one to the left and one to the right of the antenna device at the edge of the groundplane.

29. An antenna device as claimed in claim 28, wherein at least one band notch structure is incorporated into the balanced loop antenna between the additional antennas.

30. An antenna device as claimed in claim 27, wherein the first and second additional antennas are integrated with the chassis antenna and the balanced loop antenna.

31. An antenna device as claimed in claim 30, wherein the first and second additional antennas are located within a perimeter of the balanced loop antenna.

32. An antenna device as claimed in claim 31 , wherein a T-shaped groundplane extension is provided at a centre of the edge of the groundplane, with the first and second additional antennas formed around the arms of the T-shaped groundplane extension.

33. An antenna device as claimed in claim 31 or 32, wherein the balanced loop antenna is formed with a folded or meandering configuration at its left and right ends.

34. An antenna device as claimed in any one of claims 27 to 33, wherein each additional antenna is provided with matching circuitry.

35. An antenna device as claimed in claim 34, wherein the matching circuitry for each additional antenna comprises first and second matching circuits connected in parallel, the first matching circuit being optimised for a lower-frequency band and provided with a low pass filter in the form of an inductor, and the second matching circuit being optimised for a higher-frequency band and provided with a high pass filter in the form of a capacitor.

36. An antenna device substantially as hereinbefore described with reference to or as shown in the accompanying drawings.