Microwave Ferroelectric Superconducting Phase Shifter

This study provides the possibility of developing tunable microwave components based on the dielectric substrate nonlinearity, with the conducting surfaces made of a superconductor. It is shown that with a ferroelectric film thickness of 140 nm, phase shifts in the order of tens of degrees per cm can be obtained with bias voltages of tens of millivolts at 4 K for a frequency of 10 GHz.