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• W2556642279 abstract "Carrying out astronomical observations at far-infrared wavelengths is critical inenabling further progress in the fields of cosmology and astrophysics. Such observations willallow additional insight into the birth and evolution of the Universe. To allow progress in theseareas, it is necessary to improve the sensitivity and resolution of the instrumentation that is usedto carry out these observations.At the high frequencies in question (terahertz), the instruments typically make use of hornantenna fed detector systems. To achieve the required performance, the horn designs must behighly optimised. Full electromagnetic solvers (CST, HFSS, COMSOL etc.) struggle to predictthe performance of horn antennas at such high frequencies in a timely manner due to the largeelectrical size of the structures. It is therefore very challenging to perform the optimisation usingsuch solvers particularly for multi-mode systems where each mode would have to be consideredindividually.In this paper we outline an alternative technique for modelling multi-mode (partially coherent)horn antennas based on the mode-matching technique, which allows electrically large structuresto be modelled in a highly efficient manner. This technique returns a set of scattering matriceswhich gives a full vector definition of the transmission and re ection characteristics of the resultingdesign at a given frequency. We demonstrate how this can be used to extract field patterns andother figures of merit that are important for evaluating the electromagnetic performance of ahorn design.An efficient genetic algorithm based optimisation technique (using mode-matching) is also presented. The optimisation process is based on a piecewise conical profile horn design and producesa geometry that is optimised with respect to some figure of merit that is of critical importancefor the application in question. This allows the instrument to realise the high levels of opticalperformance that are required for astronomical applications." @default.
• W2556642279 created "2016-11-30" @default.
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• W2556642279 date "2015-01-01" @default.
• W2556642279 modified "2023-09-28" @default.
• W2556642279 title "The Optimisation and Analysis of Multi-moded Feed HornStructures at Terahertz Frequencies" @default.
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