Time-Switched Array Analysis of Phase-Switched Screens

In this correspondence, an analysis of phase-switched screens (PSS) based on time-switched array theory is presented. Unlike conventional transmission line analysis, the time-switched array approach allows finite-sized PSS to be analyzed. New modulation schemes for finite-sized PSS based on selective antiphase switching are introduced and analyzed. Modulation sequences in which 50% of the PSS is switched in antiphase are shown to operate differently to conventionally modulated PSS and produce zero backscattered energy at harmonic frequencies. Measurements from an experimental PSS operating at an incident frequency of 10 GHz and time-switched at 5 MHz are presented.