Design of Electromagnetic Shielding for Food Pasteurization via Corrugated Waveguide and Graphite Rings

An electromagnetic shielding, operating at f=2.45 GHz, is designed in the context of food pasteurization treatment. The industrial belt of the plant implies an undesired leakage aperture of the microwave heating chamber, fed by multiple magnetrons to raise the temperature. The shielding consists of a one-wall uniformly corrugated rectangular waveguide followed by an array of graphite rings acting as absorbers of the residual electromagnetic power. The design is performed via a 3D electromagnetic simulation. The proposed electromagnetic shielding succeeds in attenuating the electromagnetic emission, crucial for worker safety and for equipment susceptible to electromagnetic radiation. Moreover, the electromagnetic power reflected by the shielding allows to reduce energy consumption.