Development Of 6GHz-18GHz Electromagnetic Wave Absorbing Material Arch Test System

With the rapid development of electromagnetic compatibility technology,electromagnetic pollution becomes more and more serious.Therefore,it is necessary to accurately evaluate the properties of rf absorbing materials.The arch test method is mainly used to test the performance of rf absorbing materials above 1GHz,in order to improve the accuracy of measuring reflection coefficient of absorbing material,therefore,it is necessary to analyze the influence of the radius of the arch frame,the antenna gain and the area of absorbing material on the reflection coefficient.The electromagnetic compatibility laboratory of southeast university has studied the arched method device(1GHz~6GHz)and test method for many times.Now it is necessary to develop the high frequency arched method device(6GHz~18GHz).The work of this paper is as follows:1.The 6GHz~18GHz horn antenna is repaired,and the standing wave ratio of the double-ridge horn antenna is reduced from about 4.6 to about 2.5.And the electrical parameters of the antenna are tested.2.The arch frame of 6GHz~18GHz is designed,and the antenna fixture is designed.3.The optimal sizes of 6GHz~10GHz,10GHz~18GHz frequency band,and the intermediate frequency gain G of 12 dB and 16 dB antennas were designed and optimized;4.The antenna of optimal size is assembled into the arch frame,Then the reflection coefficients of different antenna gain,arched frame radius,absorber material area and isolation plate area are simulated in CST simulation software,the measured value and error of reflection coefficient of absorbing material with/without ground reflection are calculated,finally,the measured values and errors of the reflection coefficient of the absorbing material vary with the antenna gain,the radius of the arch,the area of the absorbing material and Isolation plate area;5.The LabVIEW automatic control program for testing radio frequency absorbing material is written,and the amplitude and phase of reflection coefficient of RFabsorbing material are automatically tested.The measured amplitude and calculated value of reflection coefficient are displayed in the graph along with the change curve of frequency and height.6.When there is/is no absorbing material on the ground,the reflection coefficient of absorbing material with different area of frequency band 1GHz·6GHz,6GHz~18GHz is tested,,the measured values and errors of reflection coefficients of absorbing materials with different areas are calculated,the measured reflection coefficient of the absorbing material varies with the radius of the arch,compared with the simulation rule...