Wearable antenna and wearable device
A wearable device includes a wearable body that in use is worn on or proximate a skin of a wearer and a wearable antenna embedded in the wearable body and insulated from the wearable body. The wearable antenna includes a microwave dielectric substrate having a first major surface, a second major surface opposed to the first major surface, and a relative permittivity of at least 90. An electrically conductive patch is disposed on the first major surface, a feed line is connected to a feed point of the electrically conductive patch, and an electrically conductive ground plane is disposed on a far side of the second major surface relative to the first major surface.
1. A wearable device, comprising:
a wearable body; and
a wearable antenna embedded in the wearable body and insulated from the wearable body, the wearable antenna comprising:
a microwave dielectric substrate having a first major surface and a second major surface, the second major surface opposed to the first major surface across a dimension of the microwave dielectric substrate, the microwave dielectric substrate having a relative permittivity of at least 90;
an electrically conductive patch disposed on the first major surface of the microwave dielectric substrate, the electrically conductive patch having a feed point;
a feed line electrically coupled to the feed point of the electrically conductive patch;
an electrically conductive ground plane positioned on a far side of the second major surface relative to the first major surface of the microwave dielectric substrate; and
a container made of an electrically non-conductive material, wherein the microwave dielectric substrate, the electrically conductive patch, and the electrically conductive ground plane are enclosed in the container.
2. The wearable device of claim 1 , wherein the wearable body has a ring shape.
3. The wearable device of claim 2 , wherein the wearable body is made of a metal or an alloy or a composite material comprising a metal or an alloy.
4. The wearable device of claim 2 , wherein the wearable body has a cavity, and wherein the wearable antenna is disposed in the cavity.
5. The wearable device of claim 4 , further comprising a cover mounted over an open end of the cavity to enclose the wearable antenna between the wearable body and the cover, wherein the cover is made of an electrically non-conductive material and is permeable to radio waves in at least an operation frequency range of the wearable antenna.
6. The wearable device of claim 4 , wherein the wearable antenna is insulated from the wearable body by at least one of an electrically non-conductive material and an air gap.
7. The wearable device of claim 1 , further comprising at least one input device carried by the wearable body, the at least one input device selected from a touchpad, a push button, and a joystick.
8. The wearable device of claim 1 , wherein the microwave dielectric substrate is a microwave dielectric ceramic.
9. The wearable device of claim 1 , wherein the microwave dielectric substrate has a relative permittivity in a range from 90 to 120, wherein the wearable antenna operates at a frequency in a range from 2.4 to 2.48 GHz, and wherein the microwave dielectric substrate has a width in a range from 2 mm to 8 mm and a length in a range from 2 mm to 8 mm.
10. The wearable device of claim 1 , wherein the electrically conductive patch includes a U-shaped slot, and wherein the feed line is a microstrip feed line.
11. The wearable device of claim 1 , wherein the electrically conductive ground plane is carried on the second major surface of the microwave dielectric substrate.
12. A wearable antenna, comprising:
a microwave dielectric substrate having a first major surface and a second major surface, the second major surface opposed to the first major surface across a dimension of the microwave dielectric substrate, the microwave dielectric substrate having a relative permittivity of at least 90;
an electrically conductive patch disposed on the first major surface of the microwave dielectric substrate, the electrically conductive patch having a feed point and a U-shaped slot;
a feed line connected to the feed point of the electrically conductive patch; and
an electrically conductive ground plane disposed on a far side of the second major surface relative to the first major surface of the microwave dielectric substrate.
13. The wearable antenna of claim 12 , wherein the microwave dielectric substrate is a microwave dielectric ceramic.
14. The wearable antenna of claim 12 , wherein the microwave dielectric substrate has a relative permittivity in a range from 90 to 120.
15. The wearable antenna of claim 12 , wherein the feed line is a microstrip feed line.
16. The wearable antenna of claim 12 , wherein the microwave dielectric substrate has a width in a range from 2 mm to 8 mm and a length in a range from 2 mm to 8 mm, and wherein the wearable antenna operates at a frequency in a range from 2.4 to 2.48 GHz.
17. The wearable antenna of claim 12 , further comprising a container made of an electrically non-conductive material, wherein the microwave dielectric substrate, the electrically conductive patch, and the electrically conductive ground plane are enclosed in the container.
18. The wearable antenna of claim 12 , further comprising an electrically nonconductive coating film disposed on exposed surfaces of at least the electrically conductive patch and the electrically conductive ground plane.
19. The wearable antenna of claim 12 , wherein the electrically conductive ground plane is carried on the second major surface of the microwave dielectric substrate.