HIGH FREQUENCY PCB COILS
Described herein designs for high frequency printed circuit board (PCB) resonator coils. The resonator coils are printed or etched on a thin substrate. The number of loops of the resonator coil, the width of each trace, the spacing between the traces, and the like are adjusted to increase the quality factor Q of the resonator coils.
1 . A printed resonator coil comprising:
an electrically insulating substrate; and
an electrically conducting trace attached to the substrate;
wherein the electrically conducting trace is shaped to spiral inwards making at least two loops and wherein the conducting trace spirals inwards a substantially equal percentage of a distance of each of two dimensions of the resonator coil.
2 . The resonator coil of claim 1 , wherein the resonator coil spirals at least 15% of the distance in each of the two dimensions.
3 . The resonator coil of claim 1 , wherein the resonator coil spirals at least 25% of the distance in each of the two dimensions.
4 . The resonator coil of claim 1 , wherein the resonator coil has at least one rounded corner.
5 . The resonator coil of claim 4 , wherein the shape of the resonator coil follows a smooth parametric curve shapes.
6 . The resonator coil of claim 1 , wherein the conducting trace is spaced at least 1 mm as it spirals inwards.
7 . The resonator coil of claim 1 , wherein the conducting trace is spaced to reduce the electric field between adjacent portions of the conducting trace.
8 . The resonator coil of claim 1 , further comprising one or more additional electrically conducting traces.
9 . The resonator coil of claim 8 , wherein the one or more additional electrically conducting traces are separated by an insulating layer.
10 . The resonator coil of claim 9 , wherein the one or more additional electrically conducting traces are positioned to minimize overlap with the electrically conducting trace.