Radar Cross Section and Near Field of an Engine Digital Mock-up under UHF and S Band Radar Illumination

RF stealth is an important feature of advanced fighters, and the engine represents a large scattering source. In this paper we present a digital mock-up of a fighter jet engine, and simulate its radar cross section (RCS) in UHF and S band with multi-level fast multipole method (MLFMM), and plot its near fields inside the engine. We found the boresight S-band RCS can be as high as 20 dBsm, and the near field plots indicate radar wave can transmit through the engine even at 400 MHz.