Two port CPW‐fed MIMO antenna with wide bandwidth and high isolation for future wireless applications

• Published in: International journal of RF and microwave computer-aided engineering Vol. 31; no. 8
• Main Authors: Kulkarni, Jayshri, Desai, Arpan, Sim, Chow‐Yen‐Desmond
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01.08.2021
• Subjects: Antennas; Banded structure; Bandwidths; CCL; Channel capacity; comb‐shaped; Coplanar waveguides; Correlation coefficients; CPW fed antennas; high isolation; Impedance matching; inverted‐A; MEG; MIMO communication; Performance measurement; Reflectance; Substrates; TARC; y‐shaped
• ISSN: 1096-4290; 1099-047X
• DOI: 10.1002/mmce.22700

A compact size, coplanar waveguide (CPW) fed two‐antenna multiple input multiple output (MIMO) with high isolation and excellent impedance matching operating in n77/n78/n79 5G NR sub‐6 GHz/Wi‐Fi‐5/V2X/DSRC/Wi‐Fi‐6/INSAT‐C is proposed for future wireless applications. Each antenna element is a CPW‐fed antenna type composed of an “inverted‐A,” “y‐shaped,” and “small extended stub” structures. The two‐antennas are deployed in the same orientation at an edge‐to‐edge distance of 0.06λ (λ represents free‐space wavelength at 3.70 GHz) on a shared rectangular substrate having designed footprint of 0.57λ × 0.39λ. To attain high isolation of greater than 20 dB in the desired bands of interest, a novel comb‐shaped isolating structure is deployed between the two antenna elements. From the measured results, the proposed MIMO antenna has exhibited wide 10‐dB impedance bandwidth of 88.57% (3.00‐7.70 GHz), good gain above 3 dBi and efficiency larger than 78% throughout the desired operating bands. Moreover, the MIMO diversity performance metrics including envelope correlation coefficient (ECC), diversity gain (DG), mean effective gain (MEG), total active reflection coefficient (TARC), channel capacity and channel capacity loss (CCL) are also achieved.