Aerosol-generating system and method using dielectric heating
An aerosol-generating system is provided, including an aerosol-generating device and an aerosol-forming substrate, the aerosol-generating device including: a holding and exposing space configured to receive an aerosol-forming substrate; and an electromagnetic field generator configured to generate a radio frequency (RF) electromagnetic field in the holding and exposing space, the aerosol-forming substrate being configured to be received in the holding and exposing space, the aerosol-forming substrate including or contained within a liquid-filled capsule or a gel-filled capsule, the liquid-filled capsule or gel-filled capsule being configured to rupture when the liquid or the gel is dielectrically heated by the RF electromagnetic field in the holding and exposing space. A method for generating an aerosol from an aerosol-forming substrate is also provided. A capsule for insertion into a holding and exposing space of an aerosol-generating device is also provided.
1 . An aerosol-generating system, comprising an aerosol-generating device and an aerosol-forming substrate, the aerosol-generating device comprising:
a holding and exposing space configured to receive an aerosol-forming substrate; and
an electromagnetic field generator configured to generate a radio frequency (RF) electromagnetic field in the holding and exposing space,
wherein the aerosol-forming substrate is configured to be received in the holding and exposing space, the aerosol-forming substrate including or contained within a liquid-filled capsule or a gel-filled capsule, the liquid-filled capsule or gel-filled capsule being configured to rupture when the liquid or the gel is dielectrically heated by the RF electromagnetic field in the holding and exposing space.
2 . The aerosol-generating system according to claim 1 , wherein the aerosol-forming substrate comprises tobacco.
3 . The aerosol-generating system according to claim 2 , wherein the tobacco is coated in a composition that is a gel at room temperature but is configured to liquefy as the temperature is raised.
4 . The aerosol-generating system according to claim 1 , wherein the electromagnetic field generator includes a solid state RF transistor.
5 . The aerosol-generating system according to claim 4 , wherein the solid state RF transistor is configured to generate the RF electromagnetic field.
6 . The aerosol-generating system according to claim 1 , wherein the aerosol-generating device further comprises a resonating cavity that accommodates the holding and exposing space.
7 . The aerosol-generating system according to claim 6 , the aerosol-generating device further comprising an antenna connected to the electromagnetic field generator and configured to direct the RF electromagnetic field, the antenna being positioned in the resonating cavity.
8 . The aerosol-generating system according to claim 1 , wherein the electromagnetic field generator further includes first and second electrodes configured to generate the RF electromagnetic field for the dielectric heating of the aerosol-forming substrate in the holding and exposing space.
9 . The aerosol-generating system according to claim 6 , wherein the resonating cavity is positioned adjacent to a window of the capsule.
10 . The aerosol-generating system according to claim 6 , wherein an outer surface of the capsule is generally opaque to RF radiation, the capsule comprising a first window transparent to the RF electromagnetic field.
11 . The aerosol-generating system according to claim 10 , wherein the aerosol-generating device further comprises an antenna connected to the electromagnetic field generator and configured to direct the RF electromagnetic field, the antenna being positioned adjacent to the first window.
12 . The aerosol-generating system according to claim 10 , the capsule further comprising a second window transparent to the RF electromagnetic field, the second window being positioned on an opposite side of the capsule to the first window.
13 . The aerosol-generating system according to claim 1 ,
wherein the aerosol-generating device further comprises a substrate cavity comprising one or more external walls formed from a material opaque to the RF electromagnetic field, and
wherein one or more slots are formed in the one or more external walls.
14 . The aerosol-generating system according to claim 1 , wherein the aerosol-generating device further comprises a sensor in or adjacent to the holding and exposing space, the sensor providing a signal indicative of a temperature in the holding and exposing space, and a controller connected to receive the signal from the sensor and connected to control the electromagnetic field generator in dependence on the signal from the sensor.
15 . The aerosol-generating system according to claim 1 , the aerosol-generating device further comprising a liquid reservoir and a liquid pump configured to deliver liquid from the liquid reservoir to the holding and exposing space.
16 . A method for generating an aerosol from an aerosol-forming substrate, the aerosol-forming substrate comprising or contained within a liquid-filled capsule or a gel-filled capsule, the method comprising:
placing the aerosol-forming substrate within a holding and exposing space of an aerosol-generating device;
generating a radio frequency (RF) electromagnetic field in the holding and exposing space; and
heating the liquid-filled capsule or gel-filled capsule in the holding and exposing space with the RF electromagnetic field to rupture the liquid-filled capsule or the gel-filled capsule.
17 . A capsule for insertion into a holding and exposing space of an aerosol-generating device, the aerosol-generating device having an electromagnetic field generator configured to generate a radio frequency (RF) electromagnetic field in the holding and exposing space, the capsule being filled with liquid or gel, the liquid or the gel comprising an aerosol-forming substrate, the capsule being configured to rupture when the liquid or the gel is heated by the RF electromagnetic field.