RCS Reduction Using Composite AMC Structures

In this paper,a new composite artificial magnetic conductor (AMC) surface with magneto-dielectric substrate is presented for wide band radar cross section (RCS) reduction. It is shown that magneto-dielectric substrate can increase the in-phase reflection bandwidth of AMC structure. In this structure,the composite surface consists of two AMC types that operate at two different resonance frequencies. The phase difference between these two AMC types is tuned to be close to ±180 over a wide bandwidth so that the reflections from them cancel each other. The results show with this technique, RCS reduction more than 13 dB was achieved with a 93% bandwidth.