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Abstract
This paper takes the attenuation unit of the millimetre wave coaxial attenuator working in the through state as the research object. The 3D model of the attenuation unit was created. The insertion loss and the VSWR of the attenuation unit were simulated with the help of the HFSS software. The consequences of signal integrity issues were analysed with transmission line theory. The insert loss and VSWR of attenuation unit were simulated by adding a ferrite microwave absorbing material to the model and the thickness of the absorbing material is taken as a variable at different thickness. The relationship between the insertion loss and the VSWR and the thickness of the absorbing material are fitted by numerical fitting and the thicknesses of the absorbing material which optimizes the insertion loss and the VSWR are obtained respectively.
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