After the invention of electromagnetic metasurfaces, the conventional means to reduce RCS have been improved significantly.[57][58][59] As mentioned earlier, the main objective in purpose shaping is to redirect scattered waves away from the backscattered direction, which is usually the source. However, this usually compromises aerodynamic performance.[60] One feasible solution, which has extensively been explored in recent time, is to use metasurfaces which can redirect scattered waves without altering the geometry of a target.[57][58][59] Such metasurfaces can primarily be classified in two categories: (i) checkerboard metasurfaces, (ii) gradient index metasurfaces. Similarly, negative index metamaterials are artificial structures for which refractive index has a negative value for some frequency range, such as in microwave, infrared, or possibly optical.[61] These offer another way to reduce detectability, and may provide electromagnetic near-invisibility in designed wavelengths.

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