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1. (WO2019030366) AEROSOL GENERATING SYSTEM WITH MULTIPLE INDUCTOR COILS
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CLAIMS

1. An aerosol-generating device comprising:

a housing having a chamber sized to receive at least a portion of an aerosol-forming substrate, wherein the chamber defines a heating zone;

a first coil disposed at least partially around, or adjacent to, the heating zone;

a second coil disposed at least partially around, or adjacent to, the heating zone, wherein the first coil is a drive coil couplable to a source of alternating current, and the second coil is a resonant coil of a resonant circuit, the second coil being inductively couplable to the first coil.

2. An aerosol-generating device according to claim 1 in which the resonant circuit comprises the second coil and a capacitor.

3. An aerosol-generating device according to claim 1 or 2 comprising:

a power supply and a controller electrically connected to the first coil and configured to provide the alternating current.

4. An aerosol-generating device according to any preceding claim, wherein the first coil forms part of a first circuit having a first resonant frequency, and the second coil forms part of the resonant circuit having a second resonant frequency, the first resonant frequency and the second resonant frequency being the same.

5. An aerosol-generating device according any preceding claim, wherein the first coil has a first magnetic axis and the second coil has a second magnetic axis, the first magnetic axis and the second magnetic axis being substantially parallel.

6. An aerosol-generating device according to any preceding claim, wherein the first and second coils are helical.

7. An aerosol-generating device according to any of claims 1 to 5, wherein the first and second coils are planar.

8. An aerosol-generating device according to any preceding claim, wherein the first and second coils are co-wound.

9. An aerosol-generating device according to any preceding claim comprising a DC/AC inverter for converting a DC current supplied by a DC power supply to the alternating current.

10. An aerosol-generating device according to any preceding claim further comprising a susceptor element projecting into the heating zone, wherein the susceptor element is inductively heatable by one or both of the first and second coils to heat at least a portion of an aerosol-forming substrate when the aerosol-forming substrate is at least partially received in the chamber.

1 1 . An aerosol-generating device according to claim 10, wherein the susceptor element is an elongate susceptor element arranged to penetrate the aerosol-forming substrate when the aerosol-forming substrate is received in the chamber.

12. An aerosol-generating system comprising an aerosol-generating device according to any of claims 1 to 1 1 and an aerosol-generating article comprising the aerosol-forming substrate, wherein the aerosol-generating article is configured for use with the aerosol-generating device.

13. An aerosol-generating system according to claim 12, wherein the aerosol-generating article comprises a susceptor element.