Experimental study on electromagnetic radiation effects to an electronic system through ultra-wide band source

The radiation effect experiment to a complicated electronic system by using of GW ultra-wide band (UWB) radiation source has been carried out. In cases of opening or closing the door of equipment under test (EUT) , the responses of test points on combination No.04 and No.08 of EUT have been measured. The response characteristics of test points on combination No.02 have been tested at different orientations of antenna of EUT. And spectrum analysis has been performed for response waveforms. The results have shown that the response voltage on internal circuits of EUT may reach about 1.6 kV at condition of opening door of EUT when radiated by UWB source with 2.0times104 V/m of field strength (rise time is 0.3 ns and pulse width is 3-4 ns). The maximum response voltage on combination No.02 is about 1.6 kV under condition of optimum coupling of antenna. In this case, some of the electronic components which are sensitive to electromagnetic field may be damaged. The response band width of EUT is about 500 MHz and main frequency point of response is about 70 MHz which are far apart from the working frequency of EUT. So the frequency of the outside electromagnetic field is not the main reason which affects EUT