Resonant coils with integrated capacitance

1. A resonant coil with integrated capacitance, comprising:

at least one separation dielectric layer formed of a first material and a plurality of conductor layers stacked in an alternating manner, each of the plurality of conductor layers including:

a first conductor sublayer and second conductor sublayer having common orientation, and

a sublayer dielectric layer formed of a second material separating the first and second conductor sublayers;

adjacent conductor layers of the plurality of conductor layers having different orientations and the first material having a lower dielectric loss than the second material.

2. The resonant coil of claim 1 , the second material selected from the group consisting of polyimide and FR4 epoxy fiberglass composite.

3. The resonant coil of claim 1 , the at least one separation dielectric layer and the plurality of conductor layers being concentrically stacked in an alternating manner around a common axis.

4. The resonant coil of claim 3 , the common axis forming a loop around a center axis of the resonant coil, and the resonant coil having a toroidal shape.

5. The resonant coil of claim 4 , wherein:

each first conductor sublayer forms a first discontinuity along the common axis, such that the first conductor sublayer does not completely encircle the center axis;

each second conductor sublayer forms a second discontinuity along the common axis, such that the second conductor sublayer does not completely encircle the center axis; and

within each of the plurality of conductor layers, each first discontinuity is angularly aligned with each second discontinuity around the center axis.

6. The resonant coil of claim 4 , wherein:

each first conductor sublayer forms a first discontinuity, such that the first conductor sublayer does not completely encircle the common axis;

each second conductor sublayer forms a second discontinuity, such that the second conductor sublayer does not completely encircle the common axis; and

within each of the plurality of conductor layers, each first discontinuity is angularly aligned with each second discontinuity around the common axis.

7. The resonant coil of claim 3 , wherein:

each first conductor sublayer forms a first discontinuity, such that the first conductor sublayer does not completely encircle the common axis;

each second conductor sublayer forms a second discontinuity, such that the second conductor sublayer does not completely encircle the common axis; and

within each of the plurality of conductor layers, each first discontinuity is angularly aligned within each second discontinuity around the common axis.

8. The resonant coil of claim 7 , the resonant coil having a cylindrical shape, as seen when the resonant coil is viewed cross-sectionally along the common axis.

9. The resonant coil of claim 7 , the resonant coil having a rectangular shape, as seen when the resonant coil is viewed cross-sectionally along the common axis.

10. The resonant coil of claim 1 , the at least one separation dielectric layer and the plurality of conductor layers being stacked in an alternating manner in a thickness direction.

11. The resonant coil of claim 10 , wherein, within each of the plurality of conductor layers:

each of the first and second conductor sublayers is a foil conductor having a C-shape; and

the first conductor sublayer is aligned with the second conductor sublayer, as seen when the resonant coil is viewed cross-sectionally in the thickness direction.

12. The resonant coil of claim 11 , wherein, within each of the plurality of conductor layers:

the first conductor sublayer forms a first notch;

the second conductor sublayer forms a second notch; and

the first notch is angularly aligned with the second notch around a center axis extending in the thickness direction.

13. The resonant coil of claim 12 , the first and second notches of a first conductor layer of the plurality of conductor layers being angularly displaced with the first and second notches of a second conductor layer of the plurality of conductor layers, around the center axis.

14. A magnetic device, comprising:

a magnetic core; and

the resonant coil of claim 1 .

15. A resonant coil with integrated capacitance, comprising:

first and second terminals; and

at least one separation dielectric layer formed of a first material and a plurality of conductor layers stacked in an alternating manner in a first direction, each of the plurality of conductor layers including:

a first conductor sublayer and second conductor sublayer, and

a sublayer dielectric layer formed of a second material separating the first and second conductor sublayers in the first direction;

adjacent conductor layers of the plurality of conductor layers having different orientations and the first material having a lower dielectric loss than the second material;

at least one of the plurality of conductor layers being electrically coupled to the first terminal, and at least one of the plurality of conductor layers being electrically coupled to the second terminal, such that the resonant coil has a series-resonant electrical topology as seen from the first and second terminals.

16. The resonant coil of claim 15 , within each of the plurality of conductor layers, the first and second conductor sublayer being electrically coupled in parallel.

17. The resonant coil of claim 15 , the second material selected from the group consisting of polyimide and FR4 epoxy fiberglass composite.

18. The resonant coil of claim 15 , the plurality of conductor layers comprising:

a plurality of first conductor layers;

a plurality of second conductor layers;

a plurality of third conductor layers interdigitated with the plurality of first conductor layers in the first direction; and

a plurality of fourth conductor layers interdigitated with the plurality of second conductor layers in the first direction;

the plurality of third conductor layers being electrically coupled in parallel with the plurality of fourth conductor layers.

19. The resonant coil of claim 15 , the plurality of conductor layers comprising:

a plurality of first conductor layers;

a plurality of second conductor layers; and

a plurality of third conductor layers wound around a center axis of the resonant coil, the center axis being orthogonal to the first direction;

each of the plurality of third conductor layers including:

a respective first end interdigitated with the plurality of first conductor layers in the first direction, and

a respective second end interdigitated with the plurality of second conductor layers in the second direction.