Fundamentals and Applications of High-temperature Superconducting Microwave and Millimeter Wave Devices

摘要

This paper discusses the microwave and millimeter wave fundamentals and applications of high-temperature superconductors.First,a high-temperature superconducting filter subsystem for a base station is described as an example of microwave device.In the USA,over 1,000 systems are already working as filter subsystems in 2 G mobile telephone base stations.In Japan,a field trial was carried out for a filter subsystem of an IMT-2000 base station.As the result,the effedctiventess of the superconducting filter subsystem was clarified.Therefore,the demand for superconducting filter subsystems for base stations will increase in the future.A SIS mixer and superconducting calorimeter were described as examples of millimeter and sub-millimeter wave devices.Using a Nb/AlOx/Nb SIS junction and X-ray calorimeter,which utilized micromachine technology,the resolution of such devices was quite high compared to that of conventional devices.