Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed
Dissertation (MEng (Electronic Engineering))--University of Pretoria,2025.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2026
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1869484088174313472 |
|---|---|
| access_status_str | Open Access |
| author2 | Joubert, Johan |
| author_browse | Joubert, Johan |
| author_facet | Joubert, Johan |
| collection | Thesis |
| dc_rights_str_mv | © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng (Electronic Engineering))--University of Pretoria,2025. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/107422 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-07-01T04:09:19.821Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/107422 A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed Joubert, Johan u04666705@tuks.co.za Odendaal, J.W. (Johann Wilhelm) Mattheus, Elmien UCTD Sustainable Development Goals (SDGs) Magneto-electric dipole antenna array Sequential phase feed Circular polarized Wide bandwidth Simple geometry antenna Dissertation (MEng (Electronic Engineering))--University of Pretoria,2025. Wideband, circularly polarized (CP) antennas are key components in communication systems due to their ability to reduce signal loss of transmitted and received electromagnetic waves, leading to enhanced data transfer over various distances. Over the years, different wideband CP antennas such as magneto-electric (ME) dipole antennas, crossed dipole antennas, spiral antennas and slot antennas have been developed. From literature, it is evident that ME dipole antennas are great CP antenna candidates to realise reliable communication systems due to their excellent radiation performance of wide impedance bandwidth (IBW), wide axial ratio bandwidth (ARBW) or high gain while maintaining a simple structure that can be manufactured with ease. However, a limitation exists to realise CP ME dipole antennas that simultaneously obtain wide usable bandwidth and high, stable gain without implementing complex structures, dual-feeding networks, large arrays, parasitic elements and/or additional cavities. Following a comprehensive investigation into wideband, CP antennas, the design process consisted of an antenna synthesis approach to design a printed, CP ME dipole radiator by combining elements of a previously designed CP ME dipole antenna and a printed, LP ME dipole antenna, integrating them into a new antenna structure and applying different modifications to the antenna structure to form a single CP ME dipole radiator. Simulations were executed to determine the radiation performance of the initial single CP ME dipole radiator. Furthermore, a parametric study was used to determine which dimensions affected the radiation performance and optimisation was conducted using these results to find the optimal dimensions of the single CP ME dipole radiator that led to good radiation performance of wide bandwidth and high gain. An sequential phase (SP)-feed was designed and optimised to obtain wide bandwidth with low magnitude and phase differences at each adjacent port. Afterwards, the SP-feed was combined with four of the CP ME dipole radiators to form a CP ME dipole antenna array. Simulations were executed to determine the radiation performance of the initial CP ME dipole antenna array. Another parametric study was used to determine which dimensions affected the radiation performance and the results were used to perform optimisation of the dimensions to find the final CP ME dipole antenna array. To confirm ease of manufacturing, a sensitivity analysis was conducted to determine the effect of the critical build parameter on the radiation performance. A prototype of the final CP ME dipole antenna array was built, assembled and measured in the compact range at the University of Pretoria. The final CP ME dipole antenna array showcased an IBW of 74.6%, a 3 dB ARBW of 68%, and a gain variation of 10.1 ± 2.1 dBic over the usable bandwidth with stable radiation patterns, well-formed main beams and low cross-polarization levels. A final size of 1.33λ 0 × 1.33λ 0 × 0.24λ 0 was achieved with a simple geometry and no additional cavities or parasitic elements. The designed CP ME dipole antenna array has good gain, wide bandwidth and outperforms other single-fed CP antennas available in literature i.t.o structure simplicity, wide radiation performance and improved gain. Electrical, Electronic and Computer Engineering MEng (Electronic Engineering) Unrestricted Faculty of Engineering, Built Environment and Information Technology None 2026-01-20T08:16:04Z 2026-01-20T08:16:04Z 2026-04 2025 Dissertation * A2026 http://hdl.handle.net/2263/107422 10.25403/UPresearchdata.30913439 en © 2024 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Sustainable Development Goals (SDGs) Magneto-electric dipole antenna array Sequential phase feed Circular polarized Wide bandwidth Simple geometry antenna A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed |
| title | A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed |
| title_full | A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed |
| title_fullStr | A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed |
| title_full_unstemmed | A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed |
| title_short | A wideband high gain circularly polarized antenna with magneto-electric dipoles and a sequential phase feed |
| title_sort | wideband high gain circularly polarized antenna with magneto electric dipoles and a sequential phase feed |
| topic | UCTD Sustainable Development Goals (SDGs) Magneto-electric dipole antenna array Sequential phase feed Circular polarized Wide bandwidth Simple geometry antenna |
| url | http://hdl.handle.net/2263/107422 |