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Terahertzová anténní pole pro komunikaci

Terahertz Antenna Arrays for Communications

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Author
Warmowska, Dominika
Advisor
Raida, Zbyněk
Referee
Joler, Miroslav
Pokorný, Michal
Grade
P
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Abstract
The thesis is focused on the research of THz antenna arrays to be used for communications. Attention is turned to modeling metallic surfaces at THz frequencies, a proper characterization of gold conductivity, its relation to Drude model and corresponding measurements. Moreover, the best methods for modeling thin metallic layers (depending on the skin depth related to the metal thickness) are presented. An optimized element of a THz 2×2 antenna array designed for the application of communications is developed in a way that enables an expansion to a larger array. The expansion ability is demonstrated on a 4×4 antenna array which is presented in the thesis too. The designed antennas achieve parameters better than the state-of-art antennas. The presented antennas radiate circularly polarized wave at THz frequencies, operate in a wide bandwidth, have a high gain and are of a compact size. In the thesis, an 8×8 antenna array with a beam steering capability is presented. The main beam of the antenna array can be controlled in two dimensions. A high gain of the radiated circularly-polarized wave can be achieved that way. Different approaches to modeling antennas with thin metallic layers are compared and the best methods are recommended from the viewpoint of different requirements. The designed 2×2 and 4×4 antenna arrays are manufactured using a microfabrication technology. Each step of the fabrication is described in detail and discussed. The reflection coefficient at the input of antennas is measured and compared with simulations. Discrepancies in results are associated with surface roughness which is analyzed by a scanning probe microscope and a scanning electron microscope. By down-scaling the developed THz antenna, a low-profile high-gain antenna for Ka-band space applications is designed. The presented antenna achieves better results than state-of-art CubeSat antennas. The antenna performance is verified by a prototype to be operated at 9 GHz, and the radiation characteristics are experimentally confirmed.
 
The thesis is focused on the research of THz antenna arrays to be used for communications. Attention is turned to modeling metallic surfaces at THz frequencies, a proper characterization of gold conductivity, its relation to Drude model and corresponding measurements. Moreover, the best methods for modeling thin metallic layers (depending on the skin depth related to the metal thickness) are presented. An optimized element of a THz 2×2 antenna array designed for the application of communications is developed in a way that enables an expansion to a larger array. The expansion ability is demonstrated on a 4×4 antenna array which is presented in the thesis too. The designed antennas achieve parameters better than the state-of-art antennas. The presented antennas radiate circularly polarized wave at THz frequencies, operate in a wide bandwidth, have a high gain and are of a compact size. In the thesis, an 8×8 antenna array with a beam steering capability is presented. The main beam of the antenna array can be controlled in two dimensions. A high gain of the radiated circularly-polarized wave can be achieved that way. Different approaches to modeling antennas with thin metallic layers are compared and the best methods are recommended from the viewpoint of different requirements. The designed 2×2 and 4×4 antenna arrays are manufactured using a microfabrication technology. Each step of the fabrication is described in detail and discussed. The reflection coefficient at the input of antennas is measured and compared with simulations. Discrepancies in results are associated with surface roughness which is analyzed by a scanning probe microscope and a scanning electron microscope. By down-scaling the developed THz antenna, a low-profile high-gain antenna for Ka-band space applications is designed. The presented antenna achieves better results than state-of-art CubeSat antennas. The antenna performance is verified by a prototype to be operated at 9 GHz, and the radiation characteristics are experimentally confirmed.
 
Keywords
THz antenna arrays, microfabrication, micromachining, corporate-feed arrays, beam steering, high-gain antennas, circularly polarized antennas, antennas for space applications, thin metal modeling, THz antenna modeling, thin gold modeling., THz antenna arrays, microfabrication, micromachining, corporate-feed arrays, beam steering, high-gain antennas, circularly polarized antennas, antennas for space applications, thin metal modeling, THz antenna modeling, thin gold modeling.
Language
angličtina (English)
Study brunch
Elektronika a sdělovací technika
Composition of Committee
prof. Ing. Aleš Prokeš, Ph.D. (předseda) doc. Ing. Libor Dražan, CSc. (člen) doc. Ing. David Vrba, Ph.D. (člen) doc. Ing. Václav Kotlan, Ph.D. (člen) doc. Ing. Jaroslav Láčík, Ph.D. (člen) prof. Miroslav Joler - oponent (člen) Ing. Michal Pokorný, Ph.D. - oponent (člen)
Date of defence
2020-09-01
Process of defence
Práce Ing. Dominiky Warmovské se zabývá vývojem antén pro komunikaci v terahertzových pásmech, porovnáním přístupů pro modelování metalických povrchů a zobecněním návrhových metod pro mikrovlnná pásma. Dizertační práce splňuje v důležitých aspektech stanovené cíle, přináší nové poznatky a metody v oblasti návrhu anténních polí . Doktorandka spojila ve své práci teoretické znalosti s technicko-inženýrskými schopnostmi a potvrdil tak svoji schopnost samostatné vědecké práce na velmi dobré úrovni. Komise se jednomyslně usnesla na závěru, že Ing. Dominika Warmovská splnila cíle dizertační práce a dosaženými výsledky a publikační činností splnila podmínky k udělení akademického titulu doktor.
Result of the defence
práce byla úspěšně obhájena
Persistent identifier
http://hdl.handle.net/11012/195109
Source
WARMOWSKA, D. Terahertzová anténní pole pro komunikaci [online]. Brno: Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. 2020.
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  • 2020 [27]
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