Setting waveguide radiation parameters for microwave convection installations

When using microwave treatment, the energy efficiency of installations relies on the distribution of the microwave field within the processed product layer. The distribution of the MW field is contingent on the type of emitter used. This paper presents horn, wedge, and rectangular slotted emitters. There have been addressed the challenges of ensuring uniform field distribution within MW-convection zones when employing horn and wedge waveguide emitters. Equally significant is the coordination between the magnetron system and the waveguide, which affects electrical energy losses. Standard microwave loop methods are inapplicable since the waveguides are positioned directly within the grain layer. The objective of this work is to introduce a developed methodology for aligning the parameters of the MW radiation source with the waveguide to achieve maximum overall efficiency and a minimum standing wave coefficient. The established goal is reached by determining the distance between the radiation source and the waveguide termination and by altering the termination's angle of rotation. For this purpose, the process was simulated using the CST Microwave Studio program. The CST Microwave Studio program was employed to determine these parameters for a specific emitter. CST Microwave Studio is a program designed for three-dimensional electromagnetic modeling of a wide spectrum of MW devices, including waveguides, antennas, and optical elements. The program employs several methods to address problems, ensuring high calculation accuracy. It is most effective in the shortwave to nanometer ranges. The variation in the rotation angle of the waveguide termination was modeled. The maximum overall radiation efficiency and minimum standing wave coefficient were achieved when employing waveguides with slotted emitters. To enhance overall radiation efficiency and reduce the standing wave coefficient, it is necessary to modify the placement and rotation angle of the waveguide termination.