Printed circuit boards with integrated inductors and antennas
A printed circuit board (PCB) has electronic components of an electrical circuit mounted thereon. The PCB includes a wire that is coiled through the PCB one or more turns to form a coil of an inductor or an antenna that is integrated with the PCB. The PCB can include a cutout for accepting an inductor core. The shape and/or size of the inductor core can be varied to achieve a target inductance. Both ends of the wire can be electrically connected to corresponding nodes of the electrical circuit. One end of the wire can be electrically connected to a node of the electrical circuit, and the other end of the wire can be electrically connected to an antenna body.
1. A printed circuit board (PCB) having electronic components of an electrical circuit mounted thereon, the PCB comprising:
a first layer that is a topmost layer of the PCB;
a second layer below the first layer, the second layer being a bottommost layer of the PCB;
a plurality of holes through the first and second layers; and
an inductor that is integrated with the PCB, the inductor comprising an inductor wire that is coiled through the PCB one or more turns by way of the plurality of holes,
wherein the inductor further comprises an inductor core that is embedded in the PCB and disposed within a coil formed by the inductor wire,
wherein the inductor core is disposed in a cutout in the PCB, the cutout being disposed within the coil formed by the inductor wire.
2. The PCB of claim 1 , wherein the inductor core substantially completely fills the cutout.
3. The PCB of claim 1 , wherein the inductor core does not completely fill the cutout.
4. The PCB of claim 1 ,
wherein the cutout cuts through the first and second layers of the PCB.
5. The PCB of claim 1 , wherein the inductor wire comprises copper with an enamel coating.
6. The PCB of claim 1 , wherein a first end of the inductor wire is electrically connected to a first node of the electrical circuit and a second end of the inductor wire is electrically connected to a second node of the electrical circuit.
7. The PCB of claim 6 , wherein the first end of the inductor wire is over the first layer and the second end of the inductor wire is under the second layer.
8. The PCB of claim 1 , further comprising:
an antenna body disposed on a same plane as the first layer; and
an air gap that physically separates the antenna body from the first layer,
wherein an end of the antenna body is electrically connected to an end of the inductor wire.
9. A printed circuit board (PCB) having electronic components of an electrical circuit mounted thereon, the PCB comprising:
a topmost layer;
a bottommost layer; and
an inductor that is integrated with the PCB, the inductor comprising:
an inductor wire that is coiled through the topmost layer and the bottommost layer of the PCB one or more turns; and
an inductor core that is embedded in the PCB, the inductor core running along a length of the inductor and is disposed within a coil formed by the inductor wire,
wherein the PCB further comprises a cutout that cuts through the topmost layer and the bottommost layer of the PCB, the inductor core comprises a magnetic material that is embedded in the cutout, and the cutout is disposed within the coil formed by the inductor wire.
10. The PCB of claim 9 , wherein a first end of the inductor wire is electrically connected to a first node of the electrical circuit, a second end of the inductor wire is electrically connected to a second node of the electrical circuit, and the first and second ends of the inductor wire are on opposite sides of the PCB.
11. A printed circuit board (PCB) having electronic components of an electrical circuit mounted thereon, the PCB comprising:
a topmost layer;
a bottommost layer;
an inductor wire that is coiled through the topmost layer and the bottommost layer of the PCB one or more turns;
a cutout that is disposed within a coil formed by the inductor wire; and
an antenna body that is electrically connected to a first end of the inductor wire,
wherein an inductor core is disposed in the cutout.
12. The PCB of claim 11 , wherein the antenna body is disposed on a same plane as the topmost layer.
13. The PCB of claim 12 , further comprising an air gap that physically separates the antenna body from the topmost layer.