Cylindrical Near-Field Directing Shell

In this paper, the design of a near-field shell is presented. A near-field shell is a single layer impedance sheet enclosing a radiating source that re-shapes the electromagnetic field pattern at a pre-determined image distance outside of the shell. The general design process for a cylindrical near-field shell, along with an example of a near-field shell using printed circuit board impedances to produce an arbitrary azimuthal blocking sector, is presented. Simulation results of the example show that complete azimuthal amplitude control can be achieved and that the average electric field amplitude reduction is 26.21 dB between the passing and blocking sectors of the near-field shell.