New variable phase shifter array using resonator with graded reflectivity mirror for single-control steerable phased array antenna

We propose a novel, prism-like optical device using a Gires-Tournois resonator (GTR) whose front surface mirror is coated with a pre-defined reflectivity profile. It can function as variable linearly increasing phase shift array (LIPSA) for single-control microwave phased array antenna (PAA) using heterodyne configuration. One important feature of this device is that it requires only one parameter to automatically adjust the respective phase shift of the rest of the elements in the array. This feature can drastically reduce the number of components in PAA system. Numerical results showing the coating profile and phase response are discussed. The associated set-up for microwave phase array transmitter is also presented.