Patent No. EP3818848 (titled "Aerosol Generation Apparatus Generating Aerosol Through Microwaves And Method Thereof") was filed by Kt&G on May 20, 2020. The application was issued on Sep 17, 2025.
An aerosol-generating device generates aerosols by non-contact microwave heating of a cigarette containing an aerosol-generating substrate. The device comprises a microwave generator, a microwave cavity with at least one aerosol outlet to accommodate the cigarette, and at least two microwave antennas located outside the cavity to transmit microwaves to a predetermined effective area range. To optimize heating and penetration depth, the device employs one of two configurations: (1) a microwave generator comprising at least two magnetrons producing microwaves of different frequencies, or (2) a microwave generator comprising one magnetron coupled with two or more microwave antennas of different lengths. The cavity may be cylindrical with a cross-sectional area narrowing opposite the cigarette insertion direction.

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