HTS Testing and High Q Filters
HTS Testing and High Q Filters
Routine Testing of HTS Samples
Variety of test solutions covering 35-300K and 5-40GHz
5GHz Sapphire Dielectric Resonator for 50mm diameter samples
24GHz Dielectric Resonator for 1cm2 samples
40GHz Copper Cavity for 1cm and 2cm square samples
3-D Electromagnetic model of a 24GHz Sapphire Resonator[sapphire shown in green]
Result of an electromagnetic simulation showing surface current in the superconducting end plates
High Q Resonators
A wide range of resonant structures for different applications have been fabricated and tested. These include 1 dimensional linear resonators (for oscillators and filters) 2-D resonators for high power applications (disk resonators) and 3-D structures (as above) for very low phase noise oscillators and use as a measurement tool.
Results from a disk resonator fabricated on a 2cm square LaAlO3 substrate. The unloaded Q of this structure was over 20,000 at 60K. The device was cooled in a commercial cryocooler developed as part of a collaboration between Oxford University and The Hymatic Engineering Company.
This 5GHz 3D resonator has an unloaded Q of over 800,000 at 50K. Primary use of this structure is as a measurement tool for the routine Rs measurements of 50mm diameter TBCCO thin films.
