Active Nonlinear Impedance Surfaces for Power Generation

This paper discusses tightly coupled oscillator arrays arranged in an active surface with a period significantly smaller than a free-space wavelength. The oscillating surface is a coherent source with the EIRP proportional to the square of the number of active devices. In steady-state, a circuit model informed by field theory predicts the frequency of oscillation. The single active surface concept is extended to two self-injection locked oscillating surfaces, demonstrated with preliminary experimental results around 2 GHz with GaN HEMTs.