Dipole antenna for a watchband
An electronic device such as watch adapted for wireless communication, the electronic device using a dipole antenna, the dipole antenna having two component parts, each of which being disposed in respective parts of a two-part connecting band, such as a watchband of the electronic device.
1. An electronic device adapted for wireless communication, the electronic device comprising:
an electronics case;
electronic circuitry disposed within the electronics case, the electronic circuitry providing for wireless communication;
a band connected to the electronics case; and,
a dipole antenna disposed within the band and electrically coupled to the electronic circuitry to provide for one or both of electromagnetic signal transmission and reception, the dipole antenna comprising first and second component parts, the second component part of the dipole antenna having an aperture defined therein within a width of the second component part and through a thickness of the second component to reduce interference between the first and second component parts of the dipole antenna.
2. An electronic device according to claim 1 wherein the band is an electromagnetically transmissive band.
3. An electronic device according to claim 1 wherein the dipole antenna is disposed in an electromagnetically exposed position relative to the electronics case.
4. An electronic device according to claim 1 wherein the band has first and second side portions, the first component part being disposed within the first side portion of the band, and the second component part being disposed within the second side portion of the band.
5. An electronic device according to claim 4 wherein the second side portion of the band is of a length that provides an overlapping end, wherein the overlapping end overlaps a portion of the first side portion of the band, and wherein the second component part of the dipole antenna has the aperture defined therein with a length at least as long as the overlapping end of the second side portion of the band.
6. An electronic device according to claim 4 wherein the band has a tongue buckle attached to the first side portion of the band for fastening together the first and second side portions.
7. An electronic device according to claim 6 wherein the second side portion of the band has one or more buckle holes for engagement with the tongue buckle, and
wherein the aperture defined in the second component part of the dipole antenna accommodates one or more of the one or more buckle holes.
8. An electronic device according to claim 6 wherein the second side portion of the band is of a length which defines an overlapping end, the overlapping end being adapted to overlap a portion of the first side portion of the band, and the overlapping end being adapted to accommodate the tongue buckle for fastening together the first and second side portions of the band.
9. An electronic device according to claim 8 wherein the second side portion of the band has one or more buckle holes for engagement with the tongue buckle, and
wherein the aperture defined in the second component part of the dipole antenna accommodates one or more of the one or more buckle holes, and
wherein at least one of the one or more buckle holes is disposed in the overlapping end of the second side portion of the band.
10. An electronic device according to claim 9 wherein the aperture is defined in the second component part with a length at least as long as the overlapping end of the second side portion of the band.
11. An electronic device according to claim 1 wherein the electronic device is a watch, and wherein the band is a watchband.
12. An electronic device according to claim 1 further comprising a tuning circuit for the dipole antenna, the tuning circuit including:
a fixed value inductor, and,
a variable capacitor disposed in parallel with the fixed value inductor,
wherein both the fixed value inductor and the variable capacitor are disposed in parallel with the dipole antenna.
13. An electronic device according to claim 12 further including an oscillating member to automatically switch on the tuning circuit.
14. A dipole antenna adapted to be disposed in operative association with a watch, the watch having a watch case with electronic circuitry disposed within the watch case; the watch being adapted for wireless communication, the dipole antenna being connected to the watch case and forming a watchband, the dipole antenna also being disposed in electrical communication with the electronic circuitry and disposed to provide for one or both of electromagnetic signal transmission and reception, the dipole antenna comprising:
first and second component parts of an electromagnetically active material disposed in an electromagnetically exposed disposition outside of the watch case, and disposed to one or both receive or transmit electromagnetic signals, the second component part of the dipole antenna having an aperture defined therein within a width of the second component part and through a thickness of the second component to reduce interference between the first and second component parts of the dipole antenna.
15. A dipole antenna according to claim 14 , the first component part forming a first side portion of the band, and the second component part forming a second side portion of the band.
16. A dipole antenna according to claim 15 wherein the second side portion of the band is of a length which provides an overlapping end, wherein the overlapping end overlaps a portion of the first side portion of the band, and wherein the second component part has the aperture defined therein with a length at least as long as the overlapping end of the second side portion of the band.
17. A dipole antenna according to claim 14 wherein the second side portion of the band is of a length which provides an overlapping end, wherein the overlapping end overlaps a portion of the first side portion of the band, and wherein the overlapping end accommodates the tongue buckle for fastening together the first and second side portions of the band.
18. A dipole antenna according to claim 17 wherein the second side portion of the band has one or more buckle holes for engagement with the tongue buckle, and
wherein at least one of the one or more buckle holes is disposed in the overlapping end of the second side portion of the band.
19. A tuning circuit for a dipole antenna in a wristwatch watchband, the tuning circuit comprising:
a fixed value inductor, and,
a variable capacitor disposed in parallel with the fixed value inductor,
wherein both the fixed value inductor and the variable capacitor are disposed in parallel with the dipole antenna, the dipole antenna comprising first and second component parts, the second component part of the dipole antenna having an aperture defined therein within a width of the second component and through a thickness of the second component part to reduce interference between the first and second component parts of the dipole antenna.
20. A tuning circuit according to claim 19 wherein the fixed value inductor is formed by a switchable inductor circuit switchable between two or more fixed inductances.