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Design of non-absorptive random 2-bit dielectric RCS reducer surface

This paper presents the design and results of low cost non-absorptive Radar Cross Section (RCS) reducer random 2-bit dielectric surface. The presented dielectric surface creates low level backward diffuse reflections and mimic a rough surface when its illuminated by far-field plane wave and resulting in RCS reduction. The presented design has only single dielectric layer without any metallic layer. The aperture of the presented dielectric surface is composed by unit cells of four different dielectric permittivity values (εr1=8.87, εr2=6.14, εr3=4.63 and εr4=3.49) which are distributed randomly across the dielectric RCS reducer surface aperture, i.e., 2-bit permittivity quantization. More than 8dBsm reduction in RCS is achieved from about 60GHz to 85GHz. The presented 2-bit dielectric surface is first investigated theoretically and then fabricated and now it's being measured.