Match optimization of a two-port phased array antenna element

A systematic method for designing a phased array element that is matched over a wide scan region is presented. Measured coupling coefficients from a small array of trial elements, combined with computer simulation, yield the design parameters of an individual element matching obstacle. These obstacles will optimize the match versus scan characteristics when properly inserted within the element channels. The method presented has been used to optimize the match versus scan characteristic of a circularly polarized coaxial horn type of element over a 15 percent bandwidth. A close agreement between the predicted and measured returned powers has been observed over the frequency band for a broad scan region.