Compact Hexagonal MIMO Antenna with Enhanced Bandwidth and Isolation for Adaptive 5G/6G Applications

M.Lakshmi thirupathamma M.Tech
Assistant Professor , Department of Electronics and Communication Engineering Seshadri Rao Gudlavalleru Engineering
College Gudlavalleru, Andhra Pradesh, India
M.Y.N.Neelima Sai , M.Harshitha Sai Sri , M.K.N.V.Raghuram , P.Charith Sai Final Year Students, Department of
Electronics and Communication Engineering
Seshadri Rao Gudlavalleru Engineering College Gudlavalleru, Andhra Pradesh, India

ABSTRACT:This paper presents a compact microstrip antenna array with enhanced isolation achieved using a hexagonal complementary split-ring resonator (CSRR)
metamaterial structure. Mutual coupling between closely spaced antenna elements degrades radiation performance and limits MIMO system efficiency. To address this critical issue, a hexagonal CSRR is introduced between two identical rectangular patch antennas to suppress surface current propagation. The proposed structure
creates a stopband effect at the operating frequency, effectively reducing electromagnetic interaction between the antenna elements. Simulation results using ANSYS
HFSS demonstrate a significant improvement in isolation without increasing array size or degrading impedance matching. Surface current distribution analysis confirms that the CSRR efficiently blocks coupled currents between adjacent patches. The antenna achieves a return loss of approximately -28 dB and excellent isolation characteristics, while maintaining stable radiation patterns and satisfactory gain