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In this article, A novel 64-element high-gain circularly polarized patch antenna array in the a-band is presented. Sequential rotation technique is employed here and the patches are excited by a new series-parallel feed power distribution network with microstrip transmission lines to improve the antenna performance. The results achieved show that the microstip antenna array provides a minimum peak gain of 24.4 dBi at the center frequency 29 GHz. The input return loss less than -10 dB bandwidth of the array is about 12.2, and the 3 dB axial ratio bandwidth is achieved as 5.9. The proposed a-band circularly polarized antenna array has the advantages of low-cost, less weight, compact construction and easy to be integrated with F/microwave active circuits, and allows a good prospect of application in the phased array radar and satellite communication systems.