Frequency Agile Materials for Electronics (FAME)

摘要

High performance HTS microwave filters stand to benefit from the capability to electrically tune their frequency of operation. This function may be performed with electric-field tunable dielectric materials such as SrTiO3 (STO). We have optimized the growth of STO thin films for this purpose using the growth techniques of pulsed laser ablation and reactive coevaporation. We have achieved loss tangents on the order of 0.001 at 65 K for these materials, while maintaining acceptable tunability. We have further optimized the design of STO thin-film capacitors, and we have integrated these structures into specially- designed lumped-element YBa2Cu3O7.6 (YBCO) microwave resonators and filters in order to tune their center frequencies. In this report we briefly summarize our materials development efforts as well as the design and performance of frequency agile thin-film HTS resonators and filters. This project culminated in the demonstration of a stand-alone electrically tunable 6- pole HTS filter.