A10-GHz tapered slot antenna (TSA) array of 1×8 elements is designed and fabricated using substrate integrated waveguide (SIW) technology. TheSIW binary splitters in the feed structure is utilized to minimize the feed structure insertion losses and achieve a broadband performance in X-band range.Unlike previous antennas with SIW technology, the proposed antenna array has wider impedance bandwidth (BW) and much better gain. The fabricated antenna array hasdimension of 190×130 mm2.The simulated and measured