High power cable for heated components in RF environment
A substrate support includes an edge ring, a heater element arranged within the edge ring, a ceramic layer, at least one heating element arranged within the ceramic layer, and a cable configured to provide power from a power source to the heater element and the at least one heating element. The cable includes a first plurality of wires connected to the heater element, a second plurality of wires connected to the at least one heating element, a filter module, and an isolation device connected only to the first plurality of wires between the filter module and the heater element. The first and second pluralities of wires are twisted together within the filter module. The isolation device is configured to compensate for a resonance frequency generated during operation of the heater element and the at least one heating element.
1. A substrate support, comprising:
an edge ring;
a heater element arranged within the edge ring;
a ceramic layer;
at least one heating element arranged within the ceramic layer; and
a cable configured to provide power from a power source to the heater element within the edge ring and the at least one heating element within the ceramic layer, wherein the cable includes, within the cable:
a first plurality of wires connected to the heater element within the edge ring;
a second plurality of wires connected to the at least one heating element within the ceramic layer;
a filter module, wherein the first plurality of wires and the second plurality of wires are twisted together within the filter module; and
an isolation device connected only to the first plurality of wires between the filter module and the heater element within the edge ring, wherein the isolation device is configured to compensate for a resonance frequency generated during operation of the heater element within the edge ring and the at least one heating element within the ceramic layer.
2. The substrate support of claim 1 , wherein the first plurality of wires includes a pair of wires configured to provide the power from the power source to the heater element within the edge ring.
3. The substrate support of claim 1 , wherein the at least one heating element comprises to a plurality of heating elements, and the second plurality of wires includes a plurality of pairs of wires each configured to provide the power from the power source to a respective heating element of the plurality of heating elements.
4. The substrate support of claim 1 , wherein, to compensate for the resonance frequency, the isolation device is configured to cancel the resonance frequency.
5. The substrate support of claim 1 , wherein, to compensate for the resonance frequency, the isolation device is configured to shift the resonance frequency relative to operating frequencies of radio frequency power provided to the substrate support.
6. The substrate support of claim 1 , wherein, to compensate for the resonance frequency, the isolation device has an impedance that is selected in accordance with the resonance frequency.
7. The substrate support of claim 1 , wherein the isolation device includes a transformer.
8. The substrate support of claim 1 , wherein the isolation device includes at least one of a ferrite bead and ferrite bead material.
9. The substrate support of claim 1 , wherein the first plurality of wires and the second plurality of wires are twisted together and wound around a core to form a filtering inductor within the filter module.
10. The substrate support of claim 1 , wherein the isolation device includes an inductor.
11. The substrate support of claim 10 , wherein the inductor is formed around an inductor core.
12. The substrate support of claim 11 , wherein the inductor core is a dielectric core.
13. The substrate support of claim 11 , wherein the inductor core is conductive.
14. The substrate support of claim 12 , wherein the inductor core includes one of ferrite and iron.
15. The substrate support of claim 10 , wherein the inductor is air wound.