Multi-structure antenna for multiband operation
A wireless device operates in multiple frequency bands via a multi-structure arrangement that optimizes the electromagnetic performance at each frequency range of operation. The device includes a radiating system comprising a ground plane layer, a multi-structure antenna system that comprises at least two structural branches and at least a radiation booster, and a radiofrequency system. The radiofrequency system comprises an element inserted in the branch structure, connected at a point within the structure. The radiofrequency system may include an additional matching network that fine tunes the impedance of the device to match all the frequency ranges of operation.
1. A wireless device comprising:
a radiating system comprising:
a ground plane layer shaped to provide a clearance area in a cutout that extends into the ground plane layer along a perimeter thereof;
a radiofrequency system; and
a multi-structure antenna system disposed in the clearance area and comprising:
a branch structure comprising: a common conductive strip connected to the radiofrequency system and having first and second ends, wherein a distance between the first end of the common conductive strip and a nearest point on the ground plane layer to the first end of the common conductive strip is less than a distance between the second end of the common conductive strip and a nearest point on the ground plane layer to the second end of the common conductive strip; a first conductive branch extending from the common conductive strip into the clearance area; and a second conductive branch extending from the common conductive strip into the clearance area; and
a first radiation booster connected to the first conductive branch,
wherein the radiating system is configured to operate in more than one frequency band.
2. The wireless device of claim 1 , wherein the first and second conductive branches comprise conductive strips.
3. The wireless device of claim 1 , wherein the radiofrequency system comprises a filter disposed within the branch structure.
4. The wireless device of claim 1 , wherein the clearance area extends into a corner of the ground plane layer, and wherein the first radiation booster is connected to an end of the first conductive branch.
5. The wireless device of claim 1 , wherein the multi-structure antenna system further comprises a second radiation booster connected to the second conductive branch, and wherein the radiating system is configured to operate within a frequency range of 600 MHz to 3,000 MHz.
6. The wireless device of claim 1 , wherein the multi-structure antenna system further comprises a third conductive branch extending from the common conductive strip into the clearance.
7. The wireless device of claim 1 , wherein the first conductive branch extends from a first point on the common conductive strip and the second conductive branch extends from a second point on the common conductive strip that is different from the first point.
8. The wireless device of claim 1 , wherein the first and second conductive branches have different lengths to facilitate operation in more than one frequency band.
9. A wireless device comprising:
a radiating system comprising:
a ground plane layer shaped to provide a clearance area in a cutout that extends into the ground plane layer along a perimeter thereof; and
a multi-structure antenna system disposed in the clearance area and comprising:
a branch structure comprising: a common conductive strip connected to the radiofrequency system and having first and second ends, wherein a distance between the first end of the common conductive strip and a nearest point on the ground plane layer to the first end of the common conductive strip is less than a distance between the second end of the common conductive strip and a nearest point on the ground plane layer to the second end of the common conductive strip;
a plurality of conductive branches extending from the common conductive strip into the clearance area; and
a respective plurality of radiation boosters, each of the conductive branches being connected to a corresponding one of the radiation boosters,
wherein the radiating system is configured to operate in more than one frequency band.
10. The wireless device of claim 9 , wherein the conductive branches comprise conductive strips.
11. The wireless device of claim 9 , wherein the radiofrequency system comprises a filter disposed within the branch structure.
12. The wireless device of claim 9 , wherein the multi-structure antenna system comprises first and second conductive branches and first and second radiation boosters respectively configured to operate within a first frequency range from 600 MHz to 1 GHz and within a second frequency range from 1,710 MHz to 3,000 MHz.
13. The wireless device of claim 12 , wherein the clearance area extends into a corner of the ground plane layer.
14. The wireless device of claim 9 , wherein the multi-structure antenna system comprises three conductive branches and first, second, and third radiation boosters.
15. The wireless device of claim 14 , wherein:
the first, second, and third conductive branches have different lengths to facilitate operation in more than one frequency band; and
the radiating system is configured to operate within a frequency range of 600 MHz to 3,000 MHz.
16. The wireless device of claim 9 , wherein the conductive branches extend from respective different points on the common conductive strip.