Measuring setup for determining the parameters of materials that absorb radio waves

A measuring complex for determining the coefficients of reflection and transmission of electromagnetic radiation through radio-absorbing materials has been developed and manufactured. Measurements are made by the direct method by comparison with a reference material. When measuring the transmission of radio waves through an absorbing material, the standard is air, and when measuring the reflection of radio waves, a sheet of steel is used as the standard. When measuring the transmission of radio waves through an absorbing material, the standard is air, and when measuring the reflection of radio waves, a sheet of steel is used as the standard. The installation uses replaceable horn antennas and standard microwave generators. The distance necessary for carrying out measurements in the far field of antenna radiation was determined and the maximum sizes of the irradiation spots of the measured materials for various frequencies in the range from 1 to 20 GHz were calculated. A measurement setup that is efficient in terms of the “price-quality” criterion is made, easy to maintain and does not require computational work.