This technology is used in stealth aircraft.The pointed nose of aircraft deflect those incident waves but not reflect back.Also speculate in case of rounded object with those waves.
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$\begingroup$ This is just the ordinary law of specular reflection. Angle of reflection equals angle of incidence. $\endgroup$– The PhotonCommented Sep 15, 2019 at 5:10
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Flat metal surfaces reflect radio waves the same way that mirrors reflect light beams. for the case of a flat metal surface on a plane being hit with a radar beam from an antenna on the ground a distance away, almost none of the incident beam bounces off backwards in the direction of the receiving antenna and so a plane built of such flat surfaces yields a very small signal return and becomes hard to see on radar.
For a curved surface facing an incoming radar beam, a significant fraction of the energy of the incoming beam bounces off the curve and heads back towards the antenna. Airplanes with curved surfaces are therefore easier to see with radar.
answered Sep 15, 2019 at 6:43