Generation of a prespecified electromagnetic field on the axis of a two-layer lossy cylinder

A prespecified electromagnetic field on the axis of a two-layer lossy cylinder will be assumed. The required excitation (source) that produces this field on the surface of the outer layer is calculated and then discretised to obtain an array of circumferential slots that produce the required field on the axis of the lossy cylinder. A confirming forward calculation is done to show that the array of circumferential slots produces an accurate approximation to the required field on the axis of the lossy cylinder. Results are presented to show the required surface source for different cylinder parameters and fields produced by the discrete source. This process has applications in hyperthermia, biomedical treatment, subsurface geophysical probing, focusing and nondestructive testing