Wireless device and antenna system with extended bandwidth
An apparatus comprises an antenna element operable in multiple frequency bands and configured to be connected to a ground plane and to a radiofrequency system to provide impedance matching at the multiple frequency bands, where the radiofrequency system comprising at least a matching network. A maximum length of the antenna element is shorter than L/12 but longer than L/22, where L is the free-space wavelength corresponding to a lowest frequency related to a lowest frequency region of operation of the antenna element. A contour of the antenna element has a complexity factor F12 less than 1.25.
1. An apparatus comprising:
an antenna element operable in multiple frequency bands and configured to be connected to a ground plane and to a feed line through a radiofrequency system to provide impedance matching at the multiple frequency bands, the radiofrequency system comprising at least a matching network, wherein:
a maximum length of the antenna element is shorter than L/12 but longer than L/22, where L is the free-space wavelength corresponding to a lowest frequency related to a lowest frequency region of operation of the antenna element; and
a contour of the antenna element has a complexity factor F12 less than 1.25.
2. The apparatus of claim 1 , wherein the complexity factor F12 is less than 1.1.
3. The apparatus of claim 1 , wherein the at least one matching network comprises at least an active circuit component.
4. The apparatus of claim 1 , wherein the at least one matching network comprises only passive circuit components.
5. The apparatus of claim 1 , wherein the contour of the antenna element has a complexity factor F32 less than 1.5.
6. The apparatus of claim 5 , wherein the complexity factor F32 is less than 1.25.
7. The apparatus of claim 5 , wherein the complexity factor F32 is less than 1.1.
8. The apparatus of claim 5 , wherein the complexity factor F12 less than 1.15 and the maximum length of the antenna element is between L/17 and L/22.
9. The apparatus of claim 8 , wherein the maximum length of the antenna element is between L/17 and L/20.
10. The apparatus of claim 8 , wherein the maximum length of the antenna element is L/18.7.
11. The apparatus of claim 1 , wherein the multiple frequency bands are allocated in first and second frequency regions.
12. The apparatus of claim 11 , wherein the first frequency region has an impedance bandwidth greater than 15%.
13. The apparatus of claim 11 , wherein the first frequency region has an impedance bandwidth greater than 20%.
14. The apparatus of claim 11 , wherein the first frequency region comprises the frequency range from 824 MHz to 960 MHz.
15. The apparatus of claim 11 , wherein the first frequency region comprises the frequency range from 698 MHz to 960 MHz.