Abstract: Wide-angle circularly polarized antenna and its array can be applied extensively to vehicle, aircraft andairborne radar systems. It is used to receive or transmit electromagnetic wave in large space range. This paper presents awide-angle circular polarized microstrip antenna element, and a 1×4 element linear array is designed by the elements. Thearray has some advantages, such as, compact size, light weight and wide-angle scanning with circular polarization radiationcharacteristics.