Aerosol-generating system comprising a fluid permeable susceptor element

An electrically heatable aerosol-generating system comprising an aerosol-generating device and a cartridge configured to be used with the aerosol-generating device,

• the aerosol-generating device comprising:
• a device housing comprising a cavity configured to receive at least a portion of the cartridge,
• an inductor coil,
• a power supply connected to the inductor coil and configured to provide a high-frequency oscillating current to the inductor coil, and
• electric circuitry connecting the power supply to the inductor coil, the electric circuitry comprising a class-D or class-E power amplifier;
• and
• the cartridge comprising:
• a cartridge housing configured to engage the device housing when at least a portion of the cartridge is received in the cavity of the device housing, and the cartridge containing an aerosol-forming substrate, the cartridge housing having an external surface surrounding the aerosol-forming substrate, and
• a fluid-permeable susceptor element.