Coupled re-entrant cavity system for electromagnetic levitation

This paper describes a coupled re-entrant cavity system which is designed t o provide an electric field distribution capable of generating levitation f orces on a conducting plate located in the nearfield of two or more non-rad iating coupling apertures. Re-entrant cavities are used to maximise the lev itation field at these apertures which are placed at the re-entrant cavity gap. The system represents a particularly complex electromagnetic boundary value problem and consequently the arrangement has had to be modelled using a finite element simulation package in order to secure a design. Simulatio n results from the finite element model are compared with the measured resu lts from the final design.