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The antenna was fed by a unilateral fm line and then transmitted to its taper slotline radiator. The design and fabrication of the substrate containing the fin line transmission section and tapered slot rediating section were carried out. The waveguides were also designed to house the fin line section of the substrate. Simulations were carried out using XFDTD soflware to determine the radiating characteristic of the antenna. A set of S-parameter and polarization cuwes of designed 77GHz were shown.