30 July 2002 Diffractional antenna-radomes for radar sensors: a review
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The mm-wave planar Fresnel Zone Plate (FZP) lens and antenna has the advantage of being a flat construction that is cheap, light, and easy to manufacture and have a low losses power in material. To increase the focusing efficiency, resolving and scanning properties of a flat mm-wave FZP lenses and antennas, to use an antenna surfaces as a radome and to create different shaped radiation patterns the construction of three-dimensional plate: ogival, spherical, parabolic, conical, etc., for the first time were development and investigated both theoretical and experimentally in mm-waves since 1981.
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Igor V. Minin, Oleg V. Minin, "Diffractional antenna-radomes for radar sensors: a review", Proc. SPIE 4744, Radar Sensor Technology and Data Visualization, (30 July 2002); doi: 10.1117/12.488293; https://doi.org/10.1117/12.488293

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