With the trend of multifunctionality, miniaturization and light weight, this paper, based on former researches, presents a new design of planar ultrawideband modular antenna (PUMA) array with lower profile. By replacing the substrate materials and adding metal plate at edges of antenna, the antenna can achieve lower profile and good performance within operating band of 5.5～21.35GHz. The simulation results show that the Active VSWR < 2.0, 3.0, 3.5 while scanning to broadside, 45°, 55°, respectively, and both port isolation and cross polarization can be lower than -15dB. With good performance, lower profile leads to much less cost on engineering application.