Electric field uniformity of cabin containing apertures under low level swept fields

Abstract

Low Level Swept Fields (LLSF) testing is an important part of the aircraft-level high intensity radiated fields (HIRF) effect measurements. According to the field uniformity requirement of the LLSF test in the non-enclosed aircraft cabin, the model of scaled aircraft cabin with mode stirrer placed internally is established. The field strength distribution inside the cabin exposed to the low level swept fields is analyzed by using numerical methods, for each step of mode stirrer. Based on the principle of reverberation chamber, the characteristics of electric field uniformity at different frequencies is obtained, including the relationship between the uniform volume and the frequency. It provides an important reference for limiting the distance between the stirrer and the receiving antenna for practical LLSF measurements.