Hybrid antenna system for wearable devices
An antenna system comprises a combination of a loop antenna and a non-loop antenna. The loop antenna and the non-loop antenna is connected in common to a transceiver mechanism or signal feed mechanism. The non-loop antenna is in some embodiments provided by a dipole conductor. An eye-wear device incorporates the antenna system, a loop conductor and a dipole conductor of the antenna system being integrated in a body of the eyewear device. The loop conductor may be provided by a lens ring that extends around a lens held by the body. The lens ring may serve both as loop conductor and as a lens retention mechanism.
1. An eyewear device comprising:
a body comprising:
an eyewear frame configured to hold one or more eyewear lenses, and
a pair of temples that, in a wearable configuration, project rearwards from the eyewear frame for supporting the eyewear frame within view of a user during wear of the eyewear device;
onboard electronics incorporated in the eyewear device;
an antenna system coupled to the onboard electronics for wireless signal transception to and/or from the onboard electronics; and
a lens retainer comprising an electrically conductive element extending circumferentially along an associated one of the one or more eyewear lenses, the lens retainer being selectively disposable between:
a locked condition in which the lens retainer is engaged with the associated eyewear lens to resist removal thereof from the eyewear frame, and
a released condition in which removal and replacement of the associated eyewear lens is permitted,
wherein the lens retainer is conductively coupled to the onboard electronics to provide a driven antenna element forming part of the antenna system.
2. The eyewear device of claim 1 , wherein the lens retainer comprises a lens ring which is, in the locked condition engaged with a radially outer edge face of the associated eyewear lens.
3. The eyewear device of claim 1 , wherein the driven antenna element provided by said lens retainer forms at least part of a loop conductor incorporated in the antenna system.
4. The eyewear device of claim 1 , wherein the driven antenna element provided by said lens retainer forms at least part of a non-loop conductor incorporated in the antenna system.
5. The eyewear device of claim 4 , wherein said non-loop conductor is a dipole conductor, said lens retainer forming part of one of a pair of arms of the dipole conductor.
6. The eyewear device of claim 1 , wherein the eyewear frame has a pair of eyewear lenses and a corresponding pair of lens retainers, each of the pair of lens retainers comprising a respective electrically conductive element extending circumferentially along the associated eyewear lens.
7. The eyewear device of claim 6 , wherein the antenna system comprises:
a loop conductor;
a non-loop conductor; and
a signal feed mechanism connected in common to the loop conductor and the non-loop conductor to transceive wireless electrical signals simultaneously to and/or from both the loop conductor and the non-loop conductor,
wherein said lens retainer provides at least part of the loop conductor or the non-loop conductor.
8. The eyewear device of claim 7 , wherein said lens retainer is one of a pair of lens retainers extending around respective eyewear lenses, one of the pair of lens retainers providing the loop conductor and the other one of the pair of lens retainers providing a loop-shaped portion of the non-loop conductor.
9. The eyewear device of claim 7 , wherein the loop conductor and the non-loop conductor are shaped and positioned such that a radiation pattern of the loop conductor is substantially orthogonal to a radiation pattern of the non-loop conductor, when both are driven by the signal feed mechanism.
10. The eyewear device of claim 9 , wherein the loop conductor and the non-loop conductor are shaped and have a relative spatial relationship such that the loop conductor and the non-loop conductor radiate with different respective polarizations, when driven by the signal feed mechanism.
11. The eyewear device of claim 10 , in which the non-loop conductor is a dipole conductor connected to the signal feed mechanism at a signal feed point.
12. The eyewear device of claim 11 , in which the dipole conductor is center-fed, with the signal feed point being located substantially centrally along the length of the dipole conductor.
13. The eyewear device of claim 11 , in which the dipole conductor is offset-fed, the signal feed point being offset from a center of the length of the dipole conductor.
14. The eyewear device of claim 13 , in which the offset signal feed point separates a shorter dipole arm and a longer dipole arm that together form the dipole conductor, the longer dipole arm having, for at least part of its length, an increased width relative to the shorter dipole arm.
15. The eyewear device of claim 14 , in which that portion of the longer dipole arm that has said increased width is provided by a loop-shaped portion of the longer dipole arm, the loop-shaped portion comprising a wire conductor that provides said lens retainer.
16. The eyewear device of claim 15 , in which the dipole conductor comprises:
a main portion that extends substantially parallel to a plane defined by the loop conductor; and
to at least one lateral side of the signal feed point, an angled end portion that, when the eyewear device is in the wearable configuration, projects transversely relative to the main portion.
17. The eyewear device of claim 16 , in which each of the arms of the dipole conductor defines a respective angled end portion.
18. The eyewear device of claim 17 , in which the main portion of the dipole conductor extends from side-to-side, relative to an operative viewing direction, along the eyewear frame, each angled end portion extending along a respective one of the pair of temples.
19. The eyewear device of claim 18 , wherein each of the angled end portions of the dipole conductor is provided by a respective core wire that additionally provides structural integrity to the corresponding temple.