ANTENNA FOR ELECTRONIC DEVICE

• US 20160020506A1
• Filed: 07/15/2014
• Published: 01/21/2016
• Est. Priority Date: 07/15/2014
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Mahanfar, Alireza, Shewan, Benjamin, De Luis, Javier R., Justice, Gregory Kim, Hingorani, Vinod L., Tellez, Gregorio
• Granted Patent: US 9,786,981 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G04G 21/04 using radio waves radio-controlled time-pieces G04R
• CPC Class Codes: H01Q 1/273 Adaptation for carrying or wearing by persons or animals
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

Embodiments are disclosed for an antenna system comprising an over-resonant antenna conductor and a radio receiver electrically coupled to the over-resonant antenna conductor. The antenna system further comprises a capacitor electrically coupled to the over-resonant antenna conductor and sized to match the antenna conductor to a selected frequency.

Claims

1. An antenna system comprising:

an over-resonant antenna conductor having an unmatched impedance at a target frequency beyond an unmatched resonance condition of the over-resonant antenna;

a radio receiver electrically coupled to the over-resonant antenna conductor and configured to communicate via the target frequency; and

a capacitor electrically coupled to the over-resonant antenna conductor and sized to match the over-resonant antenna conductor to the target frequency.

2. The antenna system of claim 1, wherein the over-resonant antenna conductor includes an electrically conductive trace disposed on a substrate.

3. The antenna system of claim 2, wherein the electrically conductive trace comprises an inverted-L shape to form an inverted-L antenna.

4. The antenna system of claim 2, wherein the substrate is surrounded by two stacks of dielectric material.

5. The antenna system of claim 1, wherein the capacitor is connected between the over-resonant antenna conductor and the radio receiver at a first terminal of the capacitor and to ground at a second terminal of the capacitor.

6. The antenna system of claim 1, wherein the over-resonant antenna conductor is connected to the radio receiver via a coaxial cable.

7. The antenna system of claim 6, wherein the radio receiver is housed in an enclosure formed of conductive material, and wherein the coaxial cable is configured to traverse a pass-through structure pressed into an opening in an outer wall of the enclosure.

8. The antenna system of claim 7, wherein the coaxial cable is grounded at the pass-through structure.

9. The antenna system of claim 1, wherein the target frequency is selected from a range of 1560 MHz to 1605 MHz to communicate via GPS.

10. The antenna system of claim 1, wherein the target frequency is selected from a range of 2400 MHz to 2482 MHz to communicate via Bluetooth.

11. A wearable device comprising:

a display-carrier module including a compute system and a display device;

a flexible wrist band coupled to the display-carrier module; and

an over-resonant antenna conductor located at flexible portions of the flexible wrist band outside of the display-carrier module and coupled to a capacitor, the over-resonant antenna conductor having an unmatched impedance at a target frequency beyond an unmatched resonance condition of the over-resonant antenna.

12. The wearable device of claim 11, wherein the over-resonant antenna conductor includes an electrically conductive trace disposed on a substrate.

13. The wearable device of claim 12, wherein the electrically conductive trace comprises an inverted-L shape to form an inverted-L antenna.

14. The wearable device of claim 11, further comprising a radio receiver disposed in the display-carrier module, and wherein the over-resonant antenna conductor is connected to the radio receiver via a coaxial cable.

15. The wearable device of claim 14, wherein the display-carrier module comprises an enclosure formed of conductive material, and wherein the coaxial cable is configured to traverse a pass-through structure pressed into an opening in an outer wall of the enclosure.

16. The wearable device of claim 15, wherein the coaxial cable is grounded at the pass-through structure and at substrates corresponding to each of the over-resonant antenna conductor and the radio receiver.

17. The wearable device of claim 11, wherein the over-resonant antenna conductor comprises a first over-resonant antenna conductor and the capacitor comprises a first capacitor, the wearable device further including a second over-resonant antenna conductor coupled to a second capacitor.

18. The wearable device of claim 17, wherein the first capacitor is sized to match the first over-resonant antenna conductor to a first target frequency for communicating via GPS and the second capacitor is sized to match the second over-resonant antenna conductor to a second target frequency for communicating via Bluetooth.

19. The wearable device of claim 17, wherein the first over-resonant antenna conductor is disposed on an opposite side of the display device from the second over-resonant antenna conductor.

20. A wearable device comprising:

a display-carrier module including a compute system and a display device;

a flexible wrist band coupled to the display-carrier module; and

an over-resonant antenna conductor located at flexible portions of the flexible wrist band outside of the display-carrier module, coupled to a radio receiver via a coaxial cable, and coupled to a capacitor, the over-resonant antenna conductor having an unmatched impedance at a target frequency beyond an unmatched resonance condition of the over-resonant antenna, the capacitor sized to match the over-resonant antenna conductor to the target frequency, and the coaxial cable configured to traverse and be grounded to a pass-through structure pressed into an outer wall of the display-carrier module.