Abstract
To suppress the onset of multipactor breakdown on a dielectric surface, a graded permittivity dielectric material is introduced to replace a classical single uniform dielectric material. The electromagnetic field simulation results show that the peak value of the microwave electric field will increase when the center of the microwave window is constructed from a material with a high relative permittivity. However, when the edge of the microwave window is made of such a material, the peak of the microwave electric field will decrease. In addition, the process of multipactor breakdown is investigated using the 2D particle-in-cell method. The results show that the maximum density of electrons that occurs when the edge of the microwave window is constructed from a high-relative-permittivity material is only 66.05% of that which occurs with a uniform dielectric material. As a result, the threshold of multipactor breakdown can be improved. The results reported in this paper can be used to guide the design of microwave windows.
Published Version
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