Design Of New Inverted Suspended Circular Polarized Antenna With Metasurface

Abu Bakar, Hamizan (2019) Design Of New Inverted Suspended Circular Polarized Antenna With Metasurface. Masters thesis, Universiti Teknikal Malaysia Melaka.

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Nowadays, with the fast development in wireless devices, a wireless communication system such as Wireless Local Area Network (WLAN) application has been widely developed to pave the way for the so-called anywhere, anytime communication. In recent years, an antenna with a small size and large bandwidth has received much attention. As mobile devices are using ever-bigger portions of available bandwidth; wireless providers are in search of new and better ways to boost capacity on their system. Thus, a circularly polarized antenna with small size and wide bandwidth that can operate at WLAN application operating frequency was demanded. Circularly polarized antennas can reduce the unavoided multipath interference, provide better mobility, weather penetration and flexibility in orientation angle. However, the conventional circularly polarized microstrip antenna has narrowband characteristics and more significant in size. Due to this deficiency, L-probe technique and integration of metasurface structure technique was introduced to provide miniaturization requirement and enhancement in antenna parameter performance such as bandwidth and gain. Therefore, the objective of this project was to design, simulate, fabricate and measure the design of new inverted suspended circular polarized antenna with metasurface for WLAN application at 2.4 GHz. In this project, the antennas were designed by using an inverted suspended L-probe technique with separation of air gap layer. Modified L-probe fed was used for the antenna design where the feed line was printed either at the upper or at the bottom side of the FR4 substrate. First, circular polarized rectangular patch antenna Design A (90 x 90 mm) was designed. Then, the circular polarized circular patch antenna (Design B1, B2, B3, and B4) with miniaturization up to 20.91 % (80 x 80 mm) by comparing to Design A were designed. Lastly, the most suitable of optimized metasurface structure design (Design C1) was chosen to be combined with antenna Design B4. The optimized metasurface antenna (Design BC1d) provides miniaturization, better reflection coefficient, larger bandwidth and maintaining a circular polarization property. The fabrication process is carried out using a low-cost 4.4 permittivity FR-4 substrate. Based on the simulation and measurement result, the designed metasurface antenna Design BC1d covered a frequency of 2.4 GHz with more than 450 MHz bandwidth. Other than that, the proposed metasurface antenna has the advantages of reduction in patch size up to 45.24 % and miniaturization of the antenna substrate up to 23.44 % (70 x 70 mm). Moreover, the axial ratio bandwidth (ARBW) of the metasurface antenna is up to 18.6 %. Overall, another antenna parameter such as total efficiency, directivity and realized gain of the metasurface antenna also showed good responses. Therefore, this miniaturized metasurface antenna is capable of performing circular polarization and offer wide bandwidth which is a suitable candidate to be applied for WLAN application.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Wireless LANs, Wireless communication systems, Polarized Antenna, Metasurface
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Library > Tesis > FKEKK
Depositing User: F Haslinda Harun
Date Deposited: 22 Oct 2020 14:42
Last Modified: 22 Oct 2020 14:42
Statistic Details: View Download Statistic

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