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Design and characterisation of broadband microstrip reflectarray antennas

Microstrip reflectarray antennas have the advantages of having a low profile, low loss, and low production cost, making them suitable for high gain and wide bandwidth operation for long-distance communication. However, utilizing the conventional microstrip reflectarray elements such as the rectang...

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Main Author: Phua, Yeong Nan
Format: Final Year Project / Dissertation / Thesis
Published: 2023
Subjects:
T Technology (General)
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://eprints.utar.edu.my/6236/1/PHUA_YEONG_NAN.pdf
http://eprints.utar.edu.my/6236/
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spelling my-utar-eprints.62362024-03-11T14:13:50Z Design and characterisation of broadband microstrip reflectarray antennas Phua, Yeong Nan T Technology (General) TK Electrical engineering. Electronics Nuclear engineering Microstrip reflectarray antennas have the advantages of having a low profile, low loss, and low production cost, making them suitable for high gain and wide bandwidth operation for long-distance communication. However, utilizing the conventional microstrip reflectarray elements such as the rectangular or circular patch elements is difficult to achieve the desired performances. The inherent narrow bandwidth and limited turning ability in such elements have made it difficult to achieve a smooth phase range and broadband reflectarray performance. In this dissertation, three improved designs have been formulated to overcome the mentioned limitations. The first method comprises the usage of a dumbbell-shaped square ring, combined with the Vivaldi tapered slot antenna, which is used to design a broadband reflectarray for the first time. The use of the travelling-wave radiator has enabled the proposed reflectarray element to achieve a full phase range of 371 and a low phase sensitivity of 64.6/mm simultaneously. A 1313 linearly polarized reflectarray is designed and fabricated. Measurement results show an antenna gain of 24.1 dBi with a -1-dB gain bandwidth of 10.6%, and its corresponding aperture efficiency of 40.4% is achievable at the centre frequency of 6.5 GHz. Next, a single-layer circular patch loaded with two unequal slots is designed to enhance the phase tuning ability and achieved a smooth phase range of 458. A low profile 1313 linearly polarized reflectarray is designed and fabricated. Measurement results show that an antenna gain of 23.4 dBi is realizable at the centre frequency of 9.3 GHz with an aperture efficiency of 42%.The -1-dB gain bandwidth of 11.8% has shown much improvement compared to the first design. The third design is a double-layer reflectarray element built using two closely coupled inter-layer ring-patches to improve the phase tuning ability and enhance the broad bandwidth performance. Due to the tight coupling between the inter-layer patches, the coupling between the adjacent reflectarray elements can be significantly minimised. A linear and broad phase range of 527 is achievable, and a 13×13 linearly polarized reflectarray is designed and fabricated. Measurement results show an antenna gain of 23.6 dBi at the centre frequency of 9.3 GHz with an aperture efficiency of 43.8%. The reflectarray features a broad -1-dB gain bandwidth of 33.2%. In conclusion, three unique designs have been demonstrated to overcome the narrow bandwidth of the reflectarray element by improving both the range and linearity of the reflection phase as well as the phase tuning ability. These designs can be employed to design full-fledged reflectarrays and enable wide bandwidth performance. 2023 Final Year Project / Dissertation / Thesis NonPeerReviewed application/pdf http://eprints.utar.edu.my/6236/1/PHUA_YEONG_NAN.pdf Phua, Yeong Nan (2023) Design and characterisation of broadband microstrip reflectarray antennas. PhD thesis, UTAR. http://eprints.utar.edu.my/6236/
institution Universiti Tunku Abdul Rahman
building UTAR Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tunku Abdul Rahman
content_source UTAR Institutional Repository
url_provider http://eprints.utar.edu.my
topic T Technology (General)
TK Electrical engineering. Electronics Nuclear engineering
spellingShingle T Technology (General)
TK Electrical engineering. Electronics Nuclear engineering
Phua, Yeong Nan
Design and characterisation of broadband microstrip reflectarray antennas
description Microstrip reflectarray antennas have the advantages of having a low profile, low loss, and low production cost, making them suitable for high gain and wide bandwidth operation for long-distance communication. However, utilizing the conventional microstrip reflectarray elements such as the rectangular or circular patch elements is difficult to achieve the desired performances. The inherent narrow bandwidth and limited turning ability in such elements have made it difficult to achieve a smooth phase range and broadband reflectarray performance. In this dissertation, three improved designs have been formulated to overcome the mentioned limitations. The first method comprises the usage of a dumbbell-shaped square ring, combined with the Vivaldi tapered slot antenna, which is used to design a broadband reflectarray for the first time. The use of the travelling-wave radiator has enabled the proposed reflectarray element to achieve a full phase range of 371 and a low phase sensitivity of 64.6/mm simultaneously. A 1313 linearly polarized reflectarray is designed and fabricated. Measurement results show an antenna gain of 24.1 dBi with a -1-dB gain bandwidth of 10.6%, and its corresponding aperture efficiency of 40.4% is achievable at the centre frequency of 6.5 GHz. Next, a single-layer circular patch loaded with two unequal slots is designed to enhance the phase tuning ability and achieved a smooth phase range of 458. A low profile 1313 linearly polarized reflectarray is designed and fabricated. Measurement results show that an antenna gain of 23.4 dBi is realizable at the centre frequency of 9.3 GHz with an aperture efficiency of 42%.The -1-dB gain bandwidth of 11.8% has shown much improvement compared to the first design. The third design is a double-layer reflectarray element built using two closely coupled inter-layer ring-patches to improve the phase tuning ability and enhance the broad bandwidth performance. Due to the tight coupling between the inter-layer patches, the coupling between the adjacent reflectarray elements can be significantly minimised. A linear and broad phase range of 527 is achievable, and a 13×13 linearly polarized reflectarray is designed and fabricated. Measurement results show an antenna gain of 23.6 dBi at the centre frequency of 9.3 GHz with an aperture efficiency of 43.8%. The reflectarray features a broad -1-dB gain bandwidth of 33.2%. In conclusion, three unique designs have been demonstrated to overcome the narrow bandwidth of the reflectarray element by improving both the range and linearity of the reflection phase as well as the phase tuning ability. These designs can be employed to design full-fledged reflectarrays and enable wide bandwidth performance.
format Final Year Project / Dissertation / Thesis
author Phua, Yeong Nan
author_facet Phua, Yeong Nan
author_sort Phua, Yeong Nan
title Design and characterisation of broadband microstrip reflectarray antennas
title_short Design and characterisation of broadband microstrip reflectarray antennas
title_full Design and characterisation of broadband microstrip reflectarray antennas
title_fullStr Design and characterisation of broadband microstrip reflectarray antennas
title_full_unstemmed Design and characterisation of broadband microstrip reflectarray antennas
title_sort design and characterisation of broadband microstrip reflectarray antennas
publishDate 2023
url http://eprints.utar.edu.my/6236/1/PHUA_YEONG_NAN.pdf
http://eprints.utar.edu.my/6236/
_version_ 1794644943978889216
score 13.211869

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