RF-heating in industrial metallic chambers

A method of uniform RF-Heating within a chamber, comprising:

• a. cyclically varying electromagnetic properties of a chamber according to a plurality of configuration, wherein each configuration represents an electromagnetic instance/structure within the chamber;
• b. transmitting an alternating RF signal about a first frequency range between a first frequency and a second frequency from a transmitter into the chamber;
• c. measuring electromagnetic power at a random receiver location in the chamber for each of the plurality of configurations and at a predetermined resolution of frequency thereby generating a statistical distribution vs. frequency;
• d. applying a statistical test to the generated statistical distribution based on a predetermined statistical function;
• e. determining an acceptance ratio by comparing the generated statistical distribution to the predetermined statistical function as a function of frequency;
• f. identifying a lowest usable frequency (LUF) representing a frequency at which the acceptance ratio is higher than a first threshold, the LUF establishes a second frequency range between the LUF and the second frequency;
• g. moving the transmitter and receiver antennae with respect to one another and repeating steps a-c, thereby determining a standard deviation of the average received power as a function of frequency;
• h. choosing a third frequency range associated with a standard deviation lower than a second threshold;
• and
• i. choosing an operational frequency in the third frequency range which provides maximum heating depending on the material being heated.