Homogenous microwave near-field power focusing using the electric field conjugate method and a cylindrical antenna array

Abstract

In this paper, a microwave near-field power focusing approach is proposed using a cylindrical circumferential array of electric line sources for any arbitrary homogenous medium with zero magnetic losses. In order to focus the dissipated power at the arbitrary desired point, an efficient way to obtain the excitation phases of the array elements is provided using the theoretical analysis of the complex conjugate of the electric field. Also, a closed form for the concentrated power is obtained. Using full-wave simulations, it has been shown that the theoretical analysis results are well applicable for power focusing using an array of half-wave dipole antennas.