● temperature shock: - 65 ℃ ~ 125 ℃; 100 times;

     According to gjb5239-2004 "test method of absorbing performance of RF absorbing materials", a measuring system of reflectivity of RF absorbing materials with arch method is established, which is mainly composed of arch frame, sample frame, transmitting antenna and receiving antenna, vector network analyzer and computer. The transmitting and receiving antennas of the test system are respectively installed on a section of arc frame. The center of the sample plate coincides with the center of the arc frame. High performance ram is laid around the sample bracket to reduce the background reflection. The horn antenna is installed on the arch frame, which can be moved freely and can be used in different incident angles and polarization modes. During the test, the tested parts are placed on the metal plate, tested by the transceiver antenna, collected and calculated by the corresponding test software, and finally the reflectivity test results are obtained. The performance of the test system is stable, and the results of quasi dynamic RCS system used by "standard sample" and professional test unit (207 Institute, No. 2 Institute, Ministry of space) are compared to confirm the credibility of the self built test system (see the following for details). The system can test the reflectivity of the delivered products.