Focusing Lens Design to Achieve Small Focal Spot Size in Human Body

In microwave hyperthermia, a focusing structure is designed to concentrate microwave at specific region inside human body. It is very important to find out the minimum spot size of the focused point. In this paper, a focusing lens to focus microwave inside human body at 2.45 GHz is designed and the calculation method is validated using Method of Moment (MoM). Small spot size of 1.54 cm is achieved.