Sökning: "Quasi-optical."
Visar resultat 1 - 5 av 11 avhandlingar innehållade ordet Quasi-optical..
1. NbN Hot Electron Bolometric Mixers for a Quasi--Optical THz Receiver
Sammanfattning : Experimental work on the development of a quasi-optical heterodyne receiver for the THz frequency range is reported. The mixing device is a superconducting hot electron bolometer (HEB) made from ultrathin, d = 3 - 5 nm, niobium nitride (NbN) films. LÄS MER
2. Millimetre wave waveguide enclosed grid frequency multipliers and imaging
Sammanfattning : The utilisation of the THz spectrum ( 0.3-10 THz ) is hampered by fundamental difficulties in generating power at these frequencies. LÄS MER
3. Two components for an imaging receiver
Sammanfattning : .... LÄS MER
4. Design and Performance of Some Components for a Millimeter Wave Imaging Receiver
Sammanfattning : This thesis deals with the design and performance of some novel devices for an imaging receiver, operating in the frequency band centered at 100 GHz, to be used in radio astronomy research. The emphasis is given on simple, small and reliable devices in order to reduce the complexity of an already complex receiver. LÄS MER
5. Planar Heterostructure Barrier Varactor Diodes for Millimetre Wave Applications
Sammanfattning : This thesis deals with fabrication, characterisation and modelling of the Heterostructure Barrier Varactor (HBV) diode and its use in frequency multiplier applications. Different aspects of material structures and frequency multipliers are described. LÄS MER