High-Temperature Superconductor Materials and Devices for Microwave Applications

High-Temperature Superconductor Materials and Devices for Microwave Applications Evgeniy Kolodeznyy Saint Petersburg Electrotechnical University "LETI"

Outline Applications grouped by markets Properties of HTS materials Microwave applications Conclusion

Viable Electronic Applications for HTS: Grouped by Markets Radar/Military RF • Front-end preselection • Low-phase-noise generator • Antenna matching networks 2. Communications • Low-loss, small-size filters • Multiplexers • High data-rate switching 1. 3. Computing • Cross-bar switches • Cryo-CMOS interconnections 4. Instrumentation • Voltage and current standards • Spectrum analyzer • Sampling oscilloscope

Low-Surface Resistance: Improved Performance of Microwave Devices Fig. 1 Collection of measured surface resistance data at 77 K for thin films of YBa 2 Cu 3 O 7–δ (YBCO)

Transmission Properties Fig. 2 Measured transmission response at 77 K of a four-pole-Chebyshev 1% bandwidth YBCO microstrip filter.

Two-Fluid Model of a SC Relates DC and MW properties

High-Tc Superconductor Reduce Refregiration Requirement

Materials Base for a First Generation of Devices

Comparison of Different MW Filter Types • Superconductor filters uniquely provide low loss and small volume

Measured Response of the 22 Polefilter

Photos of HTS Thin Film Filters

Filters for Cellular and PCS Base Stations

Superconductor microstrip phasedarray antenna geometry

A Comparison between a conventional transceiver (left) and an HTS transciever

Conclusion Analog HTS electronics are based on low RF surface resistance Microwave HTS filters are useful for the commercial wireless market Performance has been demonstrated for a range of devices Cost and reliability of cryocoolers is a major barrier to wider applications