Sökning: "Superconductor-Insulator-Superconductor SIS mixers"
Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Superconductor-Insulator-Superconductor SIS mixers.
1. Design Of Dual Polarisation Sideband Separation Mixer For ALMA Band 5
Sammanfattning : This licentiate is focused on the design and development of Superconductor-Insulator-Superconductor (SIS) junction mixer for ALMA Band 5, one of the ten frequency bands of the Atacama Large Millimeter Array (ALMA) project. ALMA Band 5 is a dual polarisation sideband separation heterodyne receiver covering radio frequencies (RF) from 163 GHz to 211 GHz, with 4-8 GHz intermediate frequency (IF). LÄS MER
2. Antenna Integrated Superconducting Mixers
Sammanfattning : This thesis investigates the prospects of some different superconducting mixers integrated with planar antennas for the millimeter and submillimeter regime. Two kinds of Superconductor/Insulator/Superconductor (SIS) tunnel junctions for use in mixers have been fabricated; Nb/PbBi edge junctions and Nb trilayer junctions. LÄS MER
3. Wideband THz Mixers and Components for the Next Generation of Receivers for Radioastronomy
Sammanfattning : In recent decades, there has been a growing interest in THz research, leading to substantial improvements in technology and the emergence of new applications. In particular, the ever-evolving field of radio astronomy instrumentation has been pushing the limits of millimeter and sub-millimeter technology boundaries, redefining the state-of-the-art for wideband low-noise receivers. LÄS MER
4. Mixer, Multiplier and Passive Components for Low Noise THz Receivers
Sammanfattning : This thesis presents the work done in the field of development of low noise instruments for radio astronomy applications, and addresses some of the key components in the receiver. Part of this thesis describes the design and development of a Superconductor-Insulator-Superconductor (SIS) junction mixer covering RF frequencies from 163 to 211 GHz, reaching the quantum limited noise performance. LÄS MER
5. Characterisation of the Specific Capacitance of Superconducting Tunnel Junctions
Sammanfattning : Superconductor-Insulator-Superconductor (SIS) tunnel junctions are widely used as the mixing component in mm and sub-mm receivers for radio astronomy and environmental science. SIS mixers offer superior noise performance close to the quantum limit for frequencies up to 1 THz. LÄS MER