This document presents a novel X-band slotted substrate integrated waveguide (SIW) antenna. The structure consists of a slot between two periodic rows of metallic vias inserted along the thickness of the substrate. This antenna operates in TE10 mode of excitation of the SIW at resonant frequency of 9.73 GHz. Rogers RT/Duroid 5880 is used as a dielectric substrate having permittivity 2.2 and thickness 1.575 mm. A 50 ohm conventional microstrip feedline is used to perfectly match the SIW slot

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... nna. The slot dimension is kept to be λg/2, where λg is the guided wavelength. The gain, return loss and directivity plot of this SIW slot antenna is studied. The effect of increasing the number of via has also been analyzed. This structure is designed and simulated using ANSYS HFSS (High Frequency Structure Simulator) software.