Control over electric field in traveling wave applicators

A method of optimal material design is applied to the problem of controlling the distribution of the electric field within a material heated by microwaves in closed cavities. Analytical and computational procedures are presented for a layer in a single-mode rectangular waveguide applicator. These determine the optimal placing and micro-geometry of composite controlling materials. The particular case of a lossless layer is illustrated numerically: it is shown that the controlling material becomes uniform with a dielectric constant which always exceeds the layer to be heated.