Abstract
Left-handed material (LHM) is applied to reduce the radar cross section (RCS) of microstrip antenna when the incident wave is non-perpendicular to antenna. The LHM having the magnitude of its refractive index close to zero can be used to the total reflection phenomenon and focus the electromagnetic wave. Therefore, the method of RCS reduction with LHM superstrate is presented. Two kinds of the LHM structure are proposed and two application examples are present. The simulated and measured results show that 5–20 dB RCS reduction under the condition of oblique incidence is obtained when the LHM superstrate is used. The RCS reduction angle range can be changed by adjusting the size of the LHM superstrate.
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