New Correlation Between Array Excitation and Beam Shift for Circular MIMO Antenna with C-Shaped Parasitic Element

• Published in: 2023 IEEE International Symposium on Antennas and Propagation, ISAP 2023
• Main Author: Yon H.; Rahman N.H.A.; Aris M.A.; Jamaluddin M.H.; Yamada Y.
• Format: Conference paper
• Language: English
• Published: Institute of Electrical and Electronics Engineers Inc. 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85184822658&doi=10.1109%2fISAP57493.2023.10388978&partnerID=40&md5=84204c674808d6d7aa177c34aecd56d4

This paper presents an analysis of integrated antennas with parasitic elements (IAPE) for MIMO application. Parasitic structures are known for improving bandwidth and enhancing MIMO antenna isolation. Due to the integration of the structure to the fundamental-mode conventional patch antenna design, the theoretical relationship between array excitation coefficients (β) and beam radiation angles (θ) in the modified structure shall be validated. To illustrate this concept, an equally-spaced linear array of circular patches with C-shaped parasitic elements is used. The verification process involves analyzing simulation and measurement data and comparing it to the established equation for a traditional array. The relative phases between adjacent elements were set between 00 to 900 while maintaining equal amplitudes across all elements. As a result, a new correlation has been established by normalizing the beam shift to the half-power beam width, which is applicable for the proposed design. Additionally, the effectiveness of the IAPE was confirmed through MIMO diversity performance, including low mutual coupling, 75% radiation efficiency and a gain exceeding 14dBi. © 2023 IEEE.