An apparatus and method for heating a treatment region of a subject by providing a substantially constant voltage between electrodes extending across the treatment region is disclosed. The method includes positioning a treatment region of a subject between first and second electrodes connected to a generator operable to generate a signal that is substantially a sinusoid having a wavelength λ to thereby create an alternating electric field. The treatment region is positioned adjacent at least one point on the first electrode that is located a distance of ¼λ or ¼λ plus a multiple of ½λ from the generator such that a substantially constant voltage is provided between the first and second electrodes. The method also includes activating the generator to apply the alternating electric field between the first and second electrodes and across the treatment region to thereby heat the treatment region.
