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Development of a local hot-cold antenna measurement system
Thesis (MEng)--Stellenbosch University, 2021.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2021
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| _version_ | 1867613950654283776 |
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| access_status_str | Open Access |
| author | Manas, Sean |
| author2 | Gilmore, Jacki |
| author_browse | Gilmore, Jacki Manas, Sean |
| author_facet | Gilmore, Jacki Manas, Sean |
| author_sort | Manas, Sean |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2021. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/123705 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:17.380Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/123705 Development of a local hot-cold antenna measurement system Manas, Sean Gilmore, Jacki Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. UCTD Antenna arrays Antennas, Radio Radio astronomy Temperature measuring instruments Thesis (MEng)--Stellenbosch University, 2021. ENGLISH ABSTRACT: Active antennas and antenna arrays are of great interest for high-sensitivity receiver systems, as used in radio astronomy. Several topologies for such receiver systems have low noise amplifiers closely integrated into the antenna, complicating noise measurements of sub-systems to determine the system noise temperature. This thesis presents a measurement system that can determine the system noise temperature of active antennas and antenna arrays. The developed measurement system, named Stellenbosch University Temperature Hot And COld (SU-THACO) measurement system, is deployed on the roof of the Electric and Electronic Engineering building of Stellenbosch University and operates from 1 GHz to 2 GHz. SU-THACO utilizes a graphical user interface to perform an outdoor Y-factor measurement, with the sky as the cold load and absorber material as the hot load. Radio-frequency interference is suppressed by 43.39 dBm inside the closed measurement facility, and the level of suppression is 15.19 dBm when the roof of the facility is opened. This allows for accurate noise temperature measurements in the band of interest. A successful system noise temperature measurement is completed on a com- mercially available active antenna, and there is reasonable agreement with the noise figure stated on the data sheet. AFRIKAANSE OPSOMMING: Aktiewe antennas en antenna samestellings is van groot belang vir ontvangers- telsels met hoë sensitiwiteit, wat gebruik word in toepassing soos sterrekunde. Verskeie topologieë vir sulke ontvangerstelsels het laeruis versterkers wat geïn- tegreer is met die antenna. Hierdie hoogs geïntegreerde stelsels maak dit on- moontlik om die ruistemperatuur van individuele komponente apart te meet en die stelsel-ruistemperatuur moet dus as 'n geheel bepaal word. Hierdie tesis bied 'n meetstelsel aan wat die stelsel-ruistemperatuur van aktiewe an- tennas en antenna samestellings kan bepaal. Die metingstelsel, SU-THACO, is op die dak van die Elektriese en Elektroniese Ingenieurswese-gebou van die Universiteit van Stellenbosch vervaardig en opereer vanaf 1 GHz tot 2 GHz. SU-THACO word gebruik saam met 'n grafiese gebruikerskoppelvlak om buite- muurse Y-faktor metings uit te voer. Hierdie Y-faktor meting gebruik die lug as die koue-las en absorberende materiaal as die warm-las. Metings binne die geslote meetstelsel toon dat eksterne ruisbronne met 43.39 dBm onder- druk word, en as die dak van die meetstelsel afgehaal word, word die eksterne bronne met 15.19 dBm onderdruk. Dit laat metings toe met redelike sekerheid in die frekwensie gebied van die meetstelsel. Die stelsel-ruistemperatuur van 'n kommersiële beskikbare aktiewe antenna is suksesvol gemeet en daar is re- delike ooreenstemming met die ruistemperatuur wat in die datablad aangehaal word. Masters 2021-10-12T08:11:40Z 2021-12-22T14:16:53Z 2021-10-12T08:11:40Z 2021-12-22T14:16:53Z 2021-12 Thesis http://hdl.handle.net/10019.1/123705 en_ZA Stellenbosch University 83 pages application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | UCTD Antenna arrays Antennas, Radio Radio astronomy Temperature measuring instruments Manas, Sean Development of a local hot-cold antenna measurement system |
| title | Development of a local hot-cold antenna measurement system |
| title_full | Development of a local hot-cold antenna measurement system |
| title_fullStr | Development of a local hot-cold antenna measurement system |
| title_full_unstemmed | Development of a local hot-cold antenna measurement system |
| title_short | Development of a local hot-cold antenna measurement system |
| title_sort | development of a local hot cold antenna measurement system |
| topic | UCTD Antenna arrays Antennas, Radio Radio astronomy Temperature measuring instruments |
| url | http://hdl.handle.net/10019.1/123705 |
| work_keys_str_mv | AT manassean developmentofalocalhotcoldantennameasurementsystem |