Abstract: Wideband wide-angle domain stealth is one of the key features of the next generation stealth aircraft platform.The development of ultra wideband low-profile and high stealth sensors has become the inevitable trend for such aircraft platform. In this paper, a low-profile wideband wide-angle phased array is designed to meet the requirements of ultra wideband, extreme thinness and high stealth. Based on the tightly coupling mechanism, the working frequency band of antenna array is designed to cover the whole X band, and the thickness of the antenna array is dramatically decreased. Furthermore, wide angle scanning is realized by adding an impedance matching layer. The mode scattering and structural scattering is reduced by wideband impedance matching and array error controlling technology. The simulation and experimental results show that the antenna array also has excellent wideband wide-angle radiation characteristics and low scattering characteristics, basically meet the requirements of the next generation stealth aircraft platform for low RCS array antenna. The works in this paper provide project application values on the future stealthy aircrafts antenna design.