| Abstract:In order to obtain the influence of radar absorbing coating materials on radar scattering characteristics of engine exhaust
system, three absorbing materials coating schemes were formulated and three different absorbing properties were studied. The influences of
radar absorbing coating materials on the horizontal polarization and vertical polarization RCS of the exhaust system at frequencies of 1 GHz,
8 GHz, and 18 GHz and azimuth angles ranging from -40° to 40° were simulated and analyzed by using the shooting and bouncing rays
method. The results show that with the change of coating locations of the absorbing materials, the total scattering fields formed by coupling
and superposition of scattering echoes generated by various components in the cavity also change, resulting in changes of the RCS oscilla?
tion characteristics of the exhaust system; with the increase of radar wave frequency, the impact on the oscillation characteristics gradually
increases. While keeping the same coating scheme, improving the radar absorbing performance of the material can increase the RCS reduc?
tion effect of the exhaust system without affecting the RCS oscillation characteristics. When the material reflectivity of the coating scheme
with the most coating locations is reduced from -4 dB to -6 dB, the average RCS reduction effects of the horizontal polarization at 1 GHz, 8
GHz and 18 GHz are increased to 89%, 89%, and 96%, and the average RCS reduction effects of the vertical polarization of the three
frequency points are increased to 85%, 90%, and 95%. |
