A novel antenna array architecture for low-cost and compact SATCOM mobile terminal is presented. Based on equal-amplitude\naperiodic phased array with fewer active chain numbers, it possesses advantages including lower weight, less cost, and higher power\nefficiency compared to conventional periodic phased arrays. It is implemented with printed patch antenna so that it guarantees\ncompactness. The elements position and dimensions are jointly designed, with an effective sparse array synthesis strategy that\ntakes actual patch antenna design constraint into consideration, to obtain a maximum array aperture efficiency. Executable and\npractical approach for variable dimension patch antenna designing, including defect substrate element and small scale array, is\nintroduced and utilized to implement proposed sparse array. Full-wave simulation results demonstrate the advantages of proposed\narray antenna as well as the effectiveness of corresponding design approach.
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