The Influence of Heating Object on Slotted Waveguide Radiation in Near-Field Microwave Heating

In various microwave heating methods, near-field microwave heating utilizes one or multiple antennas to radiate microwaves onto the heating object. In near-field scenarios, the presence of the heating object may influence the input impedance of the antenna. A mismatch between the microwave generator and the antenna reduces radiation power, thereby lowering the efficiency of microwave heating. This study investigates the influence of the heating object on the near-field radiation of the slotted waveguide. It examines the effects of the distance between the heating object and the slotted waveguide, as well as the dielectric constant of the heating object, on the radiation of the slotted waveguide. Furthermore, this study proposes methods for improving impedance matching of the slotted waveguide in the presence of a heating object.