Superconductoronlinear-dielectric bilayers for tunable andadaptive microwave devices

摘要

Microwave devices using coplanar waveguide (CPW) structures which incorporate bilayers of superconducting YBa2Cu3O 7-x and nonlinear dielectric SrTiO3 on 1 cm×1 cm×0.5 mm LaAlO3 substrates. The microwave devices include voltage-tunable phase shifters and delay lines, voltage-tunable mixers, and voltage-tunable and adaptive bandpass filters. Under dc voltage bias, these compact CPW devices exhibit more than 360° relative phase shift at 2 GHz, more than 30 dB tunability in mixed microwave power between 0.7 GHz and 5.9 GHz, and fine-tunable symmetric filter profile at around 2.5 GHz with less than 2% bandwidth and more than 15% adaptive range