Thesis Type: Doctorate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2023
Thesis Language: Turkish
Student: Kutay CÜNERAY
Principal Supervisor (For Co-Supervisor Theses): Nursel Akçam
Co-Supervisor: Tayfun Okan
Abstract:
In this study, a 4-element dual-band Multiple-Input Multiple-Output (MIMO) antenna is proposed to be used in Fifth Generation (5G) applications, which is a new generation communication system. The proposed antenna is designed using Rogers RT5880 laminate with dimensions of 60 x 60 x 0.508 mm3 (5.6λ0 x 5.6λ0 x 0.047λ0, λ0 is the highest wavelength) MIMO antenna performance is increased by using slots, inset fed, protrusion and Defected Ground Structure (DGS) methods. The proposed MIMO antenna communicates in the 27.54 - 30.54 GHz and 37.73 - 38.93 GHz frequency band 5G communication ranges and has a 3 GHz bandwidth for the 28 GHz frequency band and 1.2 GHz for the 38 GHz frequency band. The proposed 4 - element MIMO Antenna offers an efficiency of 99.5% at 28 GHz and 71% at 38 GHz, with greater than 30 dB isolation between antennas. Also, the maximum gains of this antenna at 28 GHz, 33 GHz and 38 GHz are presented as 8.38 dB, 7.03 dB and 8.69 dB, respectively. The antenna is also evaluated for Diversity Gain (DG), Envelope Correlation Coefficient (ECC), Total Active Reflection Coefficient (TARC), Average Effective Gain (MEG), and Channel Capacity Loss (CCL), which are important MIMO parameters. It has been determined that the MIMO antenna has suitable standards especially for 5G applications, DG greater than 9.982, ECC less than 0.0035, TARC above -15 dBi, MEG rate less than -3 dB, and CCL values much lower than 0.4 bit/s/Hz.
Key Words : 5G, Multiple Input Multiple Output (MIMO), Antenna, 28/38 GHz