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High resolution microwave leaky wave holograms excited by center-fedcylindrical surface wave launcher show a null at object wave direction which isan undesired effect for electromagnetic beamforming. Also, planar leaky wavemetasurfaces generating a tilted beam extremely suffer from the destructiveeffect of non-forward surface leaky waves at frequencies other than the designfrequency and they are almost operable at a single frequency. Here we propose a2-D modified hologram configuration using parabolic surface reflector tocollimate the non-forward leaky modes into the forward leaky modes. Themodified hologram presents null-free radiation pattern and highly improvedoperating frequency bandwidth. The consequent frequency bandwidth provides thescannabality property by frequency variation. The forward mode-dominant surfacewave excitation of hologram lets the metasurface to generate the object beammore precisely; therefore, high directivity all over the operating bandwidth isobtained. The parabolic reflector lets the radiative surface of the metasurfaceto get shrunken in less than half of the conventional holograms. The concept isverified by fabrication and experimentally tested confirming the beammaintenance over a reasonable frequency range and scannability property.

Collimating cylindrical Surface Leaky Waves for Highly Improved Radiation Characteristics of Holograms