Hexagonal focused arrays operating at 433MHz for microwave hyperthermia have been designed for the first time by optimizing the power transmission efficiency of the system consisting of the transmitting hexagonal array, a testing (receiving) antenna introduced in the target area, with an equivalent phantom representative of human body in between.

The excitations of the arrays are obtained by solving an eigenvalue equation from the scattering parameters of the total hyperthermia system, including the transmitting array, body-mimicking phantom, matching layer and a virtual receiving antenna located in the prescribed region. Simulation and experimental results have demonstrated a good focusing capability of the arrays, and such a design has the virtues of rapid implementation and adjustable focusing positions.