  High resolution microwave leaky wave holograms excited by center-fed
cylindrical surface wave launcher show a null at object wave direction which is
an undesired effect for electromagnetic beamforming. Also, planar leaky wave
metasurfaces generating a tilted beam extremely suffer from the destructive
effect of non-forward surface leaky waves at frequencies other than the design
frequency and they are almost operable at a single frequency. Here we propose a
2-D modified hologram configuration using parabolic surface reflector to
collimate the non-forward leaky modes into the forward leaky modes. The
modified hologram presents null-free radiation pattern and highly improved
operating frequency bandwidth. The consequent frequency bandwidth provides the
scannabality property by frequency variation. The forward mode-dominant surface
wave excitation of hologram lets the metasurface to generate the object beam
more precisely; therefore, high directivity all over the operating bandwidth is
obtained. The parabolic reflector lets the radiative surface of the metasurface
to get shrunken in less than half of the conventional holograms. The concept is
verified by fabrication and experimentally tested confirming the beam
maintenance over a reasonable frequency range and scannability property.
