Ultra wideband antenna for microwave imaging using modified fractal structure
Since the Federal Communication Commission release of bandwidth of 7.5 GHz (from 3.1 GHz to 10.6 GHz) for ultra wideband application (UWB), UWB is rapidly advancing as a high data rate wireless technology. Moreover, there are more challenges in designing a UWB antenna than a narrow band antenna. A s...
Disimpan dalam:
| Pengarang Utama: | |
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| Format: | Thesis |
| Diterbitkan: |
2017
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| Subjek-subjek: | |
| Capaian Atas Talian: | http://eprints.uthm.edu.my/9564/ http://eprints.uthm.edu.my/9564/1/HAMID_MOHAMMED_QASEM_RASHEDA.pdf |
| Penanda-penanda: |
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| Ringkasan: | Since the Federal Communication Commission release of bandwidth of 7.5 GHz
(from 3.1 GHz to 10.6 GHz) for ultra wideband application (UWB), UWB is rapidly
advancing as a high data rate wireless technology. Moreover, there are more challenges
in designing a UWB antenna than a narrow band antenna. A suitable UWB antenna
should be capable of operating over an ultra wide bandwidth as allocated by the FCC. In
addition, satisfactory radiation properties over the whole frequency range are necessary
as well. This project presents the design with fractal geometry of an UWB patch
antenna. To achieve UWB characteristic, a planer antenna is considered for the design
purpose. The configuration of designed antenna consisted of a partial ground and the
patch with addition of two stairs in its bottom edge connected with the feed line. The
antenna was designed and optimized using CST Microwave Studio 2014. The proposed
antenna is optimized to achieve a fractal shape by introducing slots in the patch at
various positions with half grounded structure. A compact design has been observed as
a result of optimization. Moreover, the results have been analysed to get the desired
bandwidth, and for the comparison purpose the antenna design has been fabricated
using FR-4 dielectric substrate and measured its scattering parameters using vector
network analyzer (VNA). The obtained results from the measurement have the
bandwidth ranges from 2.2 GHz to 12GHz. The analysis of simulated and measured
results shows a little deviation due to fabrication and coaxial cable losses. |
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