McLaughlin, Paul
(2014)
Computational Modelling and Experimental
Verifcation of Quasioptical Components at
Millimetre Wavelengths.
Masters thesis, National University of Ireland Maynooth.
Abstract
This thesis describes various analysis techniques used in the optical characterisation
of millimetre wave radiation. The results presented relate to
both computational simulation and experimental measurements carried out
at NUI Maynooth. The majority of the analysis is centred around a frequency
of 100 GHz, or a corresponding wavelength of 3 mm. Experimental
measurements were performed on diffractive optical elements known as axicons,
and the results were presented and compared with simulations. An
introduction to KID devices was given, along with their potential uses and a
potential analysis method using CST was outlined. These techniques using
plane wave illumination in CST were compared and verifed with Gaussian
Beam Mode Analysis. A method of analysing the form of standing waves
present in a system involving metallic rings was described. A method previously
used for the analysis of standing waves between feedhorns was adapted
to examine the form of the modes present in the resonant Fabry-Perot cavity.
Detailed analysis was performed using CST, a full electromagnetic modelling
package on resonant metallic cavities related to describing a waveguide coupled
bolometer for the SAFARI instrument on the proposed SPICA space
telescope mission. A cavity geometry was optimsed manually for optimum
cavity size and absorber size and location by performing a large number of
simulations. SCATTER, an in-house mode matching software was used to
verify the results from CST in a simple case. Various other cavity geometries
were also investigated briefy. A simplifed cavity model which could potentially
be manufactured to perform measurements at NUI maynooth was
outlined, as well as a potential detector method known as a patch antenna.
Patch antennas were designed for use at 100 GHz and briefy examined in
operation within a cavity using CST.
| Item Type: |
Thesis
(Masters)
|
| Keywords: |
Computational Modelling; Experimental Verifcation; Quasioptical Components; Millimetre Wavelengths; |
| Academic Unit: |
Faculty of Science and Engineering > Experimental Physics |
| Item ID: |
5376 |
| Depositing User: |
IR eTheses
|
| Date Deposited: |
08 Sep 2014 16:10 |
| URI: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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