Microwave heating by using flat LHM lens

Microwave heating system for hyperthermia by using four flat LHM lenses orthogonally-deployed around the heating region is proposed and simulated. For the process of heating a 6 mm-diameter tumor in homogeneous lossy dielectric medium, our 2-D FDTD simulations indicate that microwave energy can be concentrated tightly inside the tumor. Also the temperature distribution is derived through bio-heat equation (BHE), which has been solved by finite differential approach. Due to the admiring focusing properties of LHM lens, the temperature inside the tumor may rise from 37degC to more than 42.65degC during one hour with average input power density of 1.60 W/cm at 6 GHz, while the temperature of normal tissue keeps well below 42degC as the requirement of hyperthermia.

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