The Design of Compact Planar Antenna for Microwave Tomography System

Nurul Syuhada, Binti Hasim (2019) The Design of Compact Planar Antenna for Microwave Tomography System. Masters thesis, Universiti Malaysia Sarawak (UNIMAS).

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Abstract

This thesis presents the development of antenna design for microwave tomography (MWT) application such as for breast imaging for tumour detection. Thus, to achieve the goals of such application, the antenna with improved return loss, gain, directivity and radiation pattern is required in this thesis. Two types of Antipodal Vivaldi antenna (APVA) are implemented to be operated within 3.1- 10 GHz frequency. The parametric study of the parameter is carried out on the offset edge (D), wing edge (A) and ground structure (W) in order to obtain the optimized value of the performance of the antenna. Then, the prototype of the antenna is fabricated by using FR4 material and tested experimentally with the average results are recorded in term of gain with 4-6 dBi and directivity 4-7 dB within the range of frequency told. Thus, a modification of the conventional APVA is carried out by adding the slot onto the edge of the antenna. Similarly, the size of the antenna remains the same with 42.75 mm x 57.25 mm (width x length). The slotted APVA has improved the peak value of the gain and directivity by up to 73.65% with the results of 7.64 dBi and 8.92 dB, respectively. The addition of the slot directing the current flow density towards the flare, improving the concentration of the energy toward the flare and increasing the bandwidth of the antenna resulting a directional radiation pattern suitable for MWT applications. Besides that, a SAR test of conventional APVA on breast model are carried out in this research work by varying the locations, distances and power input of the contact area by implementing the IEEE C95.3 averaging method. The simulation results show that the exposure radiate by the antenna design obey the IEEE and ICNRP standard for safety levels with respect to human exposure to radio frequency EM fields.

Item Type: Thesis (Masters)
Additional Information: Thesis (Ms. of Eng.) - Universiti Malaysia Sarawak , 2019.
Uncontrolled Keywords: Ultra-wideband (UWB), Antipodal Vivaldi Antenna (APVA), Slotted APVA, Microwave Tomography (MWT), breast imaging, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, Postgraduate, research, Universiti Malaysia Sarawak.
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Academic Faculties, Institutes and Centres > Faculty of Engineering
Depositing User: NURUL SYUHADA BINTI HASIM
Date Deposited: 05 Sep 2019 00:07
Last Modified: 05 Jun 2020 03:23
URI: http://ir.unimas.my/id/eprint/26757

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