AEROSOL-GENERATING DEVICE WITH HEATING ZONE INSULATION

An aerosol-generating device is provided for heating an aerosol-forming substrate in a substantially cylindrical aerosol-generating article, the device including: a longitudinally extending cavity to receive a distal portion of the article, the cavity having a longitudinal axis and defined by a base, side walls extending from the base, and an opening at an opposite end of the cavity to the base, internal surfaces of the side walls defining a stabilising portion of the cavity having a first diameter, and a heating portion of the cavity being located between the stabilising portion and the base, the heating portion having a second diameter greater than the first diameter, and the internal surfaces further defining a locating portion at a distal end of the cavity, the heating portion being disposed between the stabilising and locating portions, the locating portion having a third diameter substantially equal to the first diameter.