Analysis of Radiation and Scattering Characteristics of Phased Array Antenna Integrated with Active Radome Using GSM Method

Integrating phased array antenna with functional radome in near field exhibits increasing interests in the practical applications. However, near-field coupling between the array antenna and functional radome, such as frequency selective surface (FSS), wide angle impedance matching (WAIM) structure, directly affects the radiation and scattering characteristics of the phased array system. In this paper, the generalized scattering matrix (GSM) method is applied to analyze the near-field coupling between phased array antenna and electrically tunable FSS as the active radome with Floquet mode theorem, and build up the relationship between the near-field coupling and antenna system performance in terms of radiation and scattering characteristics. Numerical examples demonstrate that the GSM method works for the antenna array integrated with the active radome and offers the total radiation and scattering characteristics for the radiation beam from boresight and steering, it permits to generate transmission mechanism and coupling relationship of the multi-layer electromagnetic structure by post-processing, and systematically optimizes the radome structure for a predesigned antenna array.