Development of Thin Dielectric Lens Antenna for Small Focusing Spot in Human Body

In hyperthermia therapy, it is necessary to assure electromagnetic radiation is concentrated only on the targeted area and not in the surrounding healthy tissues. An initial focused dielectric lens operated at 2.45 GHz has been designed to achieve small focusing spot in 2/3 muscle equivalent phantom. Thickness of the initial lens is then minimized to develop a thin lens. The spot size and power density at the focusing spot are evaluated between the thin lens and the initial lens design. Power density achieved by the thin lens is in good agreement to that of the initial lens. The treatment spot of 2.78 cm is capable to be achieved by the thin lens. The proposed thin lens design might be suitable for achieving small focusing spot in human body.