METHOD FOR MEASURING REFLECTION COEFFICIENT OF SKEW INCIDENCE WAVE OF OUTER WALL

摘要

PURPOSE:To enable a reflection coefficient of a body to be tested to be measured with improved efficiency and accuracy by plotting a reflection wave graph with a computer according to continuous measurement result of a reflection wave level of a skew incidence electromagnetic wave while elevating the body to be tested which is set skewly and a reflection plate which is provided at right angle to it. CONSTITUTION:A reflection plate 20 is provided at right angle to a stage 18 which can be slanted and then a body to be tested 21 is mounted to the stage 18 and is placed directly below a center of transmission and reception antennas 15 and 16. Then, an output frequency of a network analyzer 17 is set to for example 375MHz, distance between the antenna 16 and the body to be tested 21 is measured, a lowering distance of an elevation device 12 is set to 80cm or more since the wavelength is 80cm, thus enabling a measurement frequency and a position information of the antenna 16 and the body to be tested 21 at a position where measurement is started to be inputted to a computer 13. Then, electromagnetic wave is allowed to enter the body to be tested 21 and the plate 20 from the antenna 15, the device 12 is lowered, and a reflection wave level and the position information are automatically measured continuously by automatic control of the computer 13, thus enabling a reflection wave graph to be plotted. Therefore, a reflection coefficient can be measured with improved efficiency and accuracy.