Characterization of compact extremely wideband MIMO antenna for isolation enhancement and additional notch bands

Abstract

This thesis delves into the innovative design and optimization of compact ExtremelyWideband newline(EWB) Multiple-Input Multiple-Output (MIMO) antennas, focusing on enhancing isolation newlineand introducing additional notch bands to address the pressing constraints in contemporary newlinediversity antenna systems. MIMO antennas are critical for modern wireless communication, newlinebut their performance is often hampered by mutual coupling, low gain, and the need for newlinecompactness without sacrificing efficiency. This research systematically tackles these challenges newlinethrough the development of five novel MIMO antenna designs, each incorporating newlineadvanced techniques for improving isolation, gain, and bandwidth while maintaining a lowcomplexity newlinestructure. newlineThe first design features a compact L-slotted EWB MIMO antenna that achieves selfisolation newlineacross a broad frequency range, including effective notch-band performance, without newlinerequiring extra structures for decoupling. The second antenna layout introduces a novel SES newlineEWB-MIMO antenna with triple notch characteristics, effectively filtering out interference newlineacross the X, Ku, and Ka bands while maintaining high gain and isolation. The third design newlinepresents a pentagonal patch antenna with loop-based hexagonal rings, achieving triple notch newlinebands and extensive impedance bandwidth, making it ideal for space-constrained applications. newlineThe fourth design focuses on a miniaturized Co-CSRR loaded Tri-Quadrant Circular EWB newlineMIMO antenna, which offers a remarkable bandwidth of 85.8 GHz and four distinct notch newlinebands, with isolation levels reaching 31.5 dB. The final design integrates a slotted hexagonal newlinepatch with a metasurface, achieving exceptional gain and isolation across multiple frequency newlinebands, positioning it as highly suitable for 5G and satellite communications. newlineEach of these designs was meticulously simulated and validated through fabrication, with newlinekey performance indicators such as reflection coefficients (S11), gain, Envelope Correlation newlineCoefficient (ECC), Total Active Reflection Coefficient (TARC),