Oblique incidence performance of radar absorbing honeycombs

Coated with carbon powder based absorbing material, the hexagonal honeycomb (HH) becomes a multifunctional structural material, possessing load-carrying and radar-absorbing abilities. The microwave absorbing behavior changes with the density and the thickness of the HH. Under oblique incidence, the radar absorbing hexagonal honeycomb (RAHH) still has excellent microwave absorbing ability. Under wide-angle oblique incidence where the oblique angle is 55°, the RAHHs lose their radar absorbing ability and become radar reflective structure. Through the research the RAHHs have the capabilities of load bearing and electromagnetic energy absorbing, but the oblique incident angle must be limited within 45°.