Patent ID: 8653482

Claim:
An apparatus for freezing an RF absorbing body, the apparatus comprising: a cooler, comprising a coolant at a temperature below a freezing point of the RF absorbing body; a heater, comprising: a solid state amplifier as a source of at least one of microwave energy and UHF energy; a resonant cavity, configured to create a heating zone in the RF absorbing body, such that regions of the RF absorbing body that are within the heating zone are selectively heated; a feed configured to feed the resonant cavity with at least a portion of the at least one of the microwave energy and the UHF energy; and a controller, configured to control one or more of the cooler, a position of the RF absorbing body and the heater to heat the RF absorbing body by the at least one of the microwave energy and the UHF energy fed to the resonant cavity through the feed to a substantially uniform temperature above the freezing point of the RF absorbing body while maintaining the temperature of the coolant below the freezing point of the RF absorbing body, wherein the controller is configured to control the heater to produce electromagnetic waves having a frequency higher than or equal to a resonant cutoff frequency of the resonant cavity.