Design of a compact and wide-band monopole antenna
This dissertation presents two compact wide-band monopole antenna designs for the VHF/UHF frequency band, one is a two-dimensional (2-D) structure, and the other is a three-dimensional (3-D) structure. The 2-D design uses a tapered microstrip line feeding structure to improve the impedance matchin...
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| Формат: | Thesis-Master by Coursework |
| Мова: | English |
| Опубліковано: |
Nanyang Technological University
2023
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| Онлайн доступ: | https://hdl.handle.net/10356/166860 |
| _version_ | 1826122117750456320 |
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| author | Fu, Bangye |
| author2 | Shen Zhongxiang |
| author_facet | Shen Zhongxiang Fu, Bangye |
| author_sort | Fu, Bangye |
| collection | NTU |
| description | This dissertation presents two compact wide-band monopole antenna designs for the VHF/UHF frequency band, one is a two-dimensional (2-D) structure, and the other is a three-dimensional (3-D) structure.
The 2-D design uses a tapered microstrip line feeding structure to improve the impedance matching. The patches of both layers are designed with slots to obtain a longer current path, improve the low-frequency performance, and reduce the antenna size. The bandwidth of this design is 0.21 GHz-0.96 GHz (128.2%) with VSWR less than 2.5, and this design has a compact electrical size of 0.31λmax×0.08λmax, where λmax is the free-space wavelength at the lowest operating frequency.
The 3-D design is similar to a cylinder. A split cone structure is used as the central cone, and a slotted top-loading structure with meander lines is used to reduce the height and extend the current path. And a sleeve structure applied outside of the meander lines further increases the bandwidth. With the above structures, the antenna can achieve an operating bandwidth from 0.20 GHz-0.82 GHz (126.1%) with VSWR less than 2, and the electrical size is 0.08λmax×0.18λmax×0.18λmax. |
| first_indexed | 2024-10-01T05:43:15Z |
| format | Thesis-Master by Coursework |
| id | ntu-10356/166860 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:43:15Z |
| publishDate | 2023 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1668602023-07-04T16:32:37Z Design of a compact and wide-band monopole antenna Fu, Bangye Shen Zhongxiang School of Electrical and Electronic Engineering EZXShen@ntu.edu.sg Engineering::Electrical and electronic engineering This dissertation presents two compact wide-band monopole antenna designs for the VHF/UHF frequency band, one is a two-dimensional (2-D) structure, and the other is a three-dimensional (3-D) structure. The 2-D design uses a tapered microstrip line feeding structure to improve the impedance matching. The patches of both layers are designed with slots to obtain a longer current path, improve the low-frequency performance, and reduce the antenna size. The bandwidth of this design is 0.21 GHz-0.96 GHz (128.2%) with VSWR less than 2.5, and this design has a compact electrical size of 0.31λmax×0.08λmax, where λmax is the free-space wavelength at the lowest operating frequency. The 3-D design is similar to a cylinder. A split cone structure is used as the central cone, and a slotted top-loading structure with meander lines is used to reduce the height and extend the current path. And a sleeve structure applied outside of the meander lines further increases the bandwidth. With the above structures, the antenna can achieve an operating bandwidth from 0.20 GHz-0.82 GHz (126.1%) with VSWR less than 2, and the electrical size is 0.08λmax×0.18λmax×0.18λmax. Master of Science (Communications Engineering) 2023-05-09T06:44:13Z 2023-05-09T06:44:13Z 2023 Thesis-Master by Coursework Fu, B. (2023). Design of a compact and wide-band monopole antenna. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/166860 https://hdl.handle.net/10356/166860 en application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Electrical and electronic engineering Fu, Bangye Design of a compact and wide-band monopole antenna |
| title | Design of a compact and wide-band monopole antenna |
| title_full | Design of a compact and wide-band monopole antenna |
| title_fullStr | Design of a compact and wide-band monopole antenna |
| title_full_unstemmed | Design of a compact and wide-band monopole antenna |
| title_short | Design of a compact and wide-band monopole antenna |
| title_sort | design of a compact and wide band monopole antenna |
| topic | Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/166860 |
| work_keys_str_mv | AT fubangye designofacompactandwidebandmonopoleantenna |