Abstract: Based on the standard single layer printed circuit board ( PCB ) process, a 2伊2 longitudinal slot antenna sparse arrays at X band is designed and fabricated. Sparse layout could lead to an easy design and a lower requirement for fabrication accuracy. Moreover, it broadens the bandwidth,and roses the design effectiveness due to the lower internal and external mutual couplings. Simulated and measured results demonstrate the validity and efficiency of proposed scheme in this paper