Design of circular polarized antenna with metasurface

• المؤلف الرئيسي: Abu Salim, Siti Aishah
• التنسيق: أطروحة
• اللغة: الإنجليزية; الإنجليزية
• منشور في: 2021
• الموضوعات: T Technology (General); TK Electrical engineering. Electronics Nuclear engineering
• الوصول للمادة أونلاين: http://eprints.utem.edu.my/id/eprint/25984/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=121195

Wireless communication such as Wireless Local Area Network (WLAN) has become the fastest-growing segment with the demand for higher data rates and long-range antenna in order to obtain fast information at any time and anywhere. Therefore, smaller antenna size with high performance and low cost has received a lot of attention. In this case, circular polarized (CP) antennas were very promising when a transmitter and a receiver were deployed without causing polarization mismatch effect. Despite that conventional circular polarized microstrip patch antenna usually has narrow bandwidth and low gain. Thus, slot or aperture was introduced to enhance the antenna bandwidth and metasurface was integrated to the antenna for high gain characteristics at the same time provide simple and miniaturize size. Therefore, this research focusing on designing a circularly polarized antenna with metasurface. The antennas were designed, simulate, and fabricate based on the single feed aperture technique. Then, the integration of metasurface was studied. The project begins with the design of the basic structure of the aperture circular polarization antenna (Design A) and continues the process of refinement by implementing the stripline feeding method (Design B). By using the stripline method, the antenna gain enhance about 2 dB and broaden the axial ratio bandwidth (ARBW) more than 2 GHz from Design A. Then, the optimum designed antenna was combined with a simple truncate square metasurface structure (Design D1 and Design D2) and the performance was analyzed. Design and simulation of the antenna were performed using Computer Simulation Technology (CST) software. The antennas were designed, simulated, and fabricated by using the FR-4 substrate. Overall, Design B, Design D1, and Design D2 cover 5.5 GHz frequency with circular polarized (CP) operating bandwidth more than 1000 MHz. In addition, all the designs have more than 5 dB gain with miniature size up to 50%. Other antenna parameters such as return loss, directivity, and efficiency showed a good acceptable performance throughout the operating bandwidth. Therefore, a circularly polarized antenna with metasurface provides wide bandwidth and high gain which is an appropriate candidate for WLAN application.