Power deposition and focusing in a lossy cylinder by a concentric phased array

We present an analysis of phased array applicators for heating of torso, limbs, and neck. A homogeneous cylindrical model is adopted for the calculations. Four‐, eight‐, and 16‐horn apertures are considered. Focusing of power is demonstrated for an operation frequency of 915 MHz in a cylindrical phantom of radius 5.2 cm, with a conductivity of 1.28 S/m and a relative permittivity of 51. Experimental verification is shown for the case with four‐horn applicators. We thus demonstrate that by controlling the relative phases and amplitudes of the aperture sources, it is possible to focus electromagnetic power at desired locations such as tumors.