Non-dispersive tunable reflection phase shifter based on non-Foster circuits

A new non-dispersive tunable reflection phase shifter is introduced based on the artificial magnetic conductor (AMC) loaded with non-Foster circuits (NFCs). An AMC structure circuit model is extracted and the possibility of mitigating its intrinsic strong dispersion is discussed by loading it with both negative capacitance and negative inductance. The NFC is designed to produce the negative capacitance and inductance based on highly accurate, scalable measurement-based models, and co-simulated with a realistic model of the AMC. The numerical results are in good agreement with the analysis and show a nearly flat reflection phase from 450 to 600 MHz. This flat reflection phase can further be tuned by tuning the loaded inductance from 30 to 50 nH. This investigation paves the way towards a dispersion-less reflection phase shifter design.