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A multipurpose antenna system that can handle a broad area of frequencies is crucial in the effort to build up widespread 5G Internet-of-Things (IoT) networks. For fifth-generation Internet-of-things applications, this research introduces a new multi-band antenna that can operate in the sub-6 GHz band (2–7 GHz), Ku-band (13–17.5 GHz), and millimeter wave band (25–39 GHz). The antenna achieves a remarkable three-band operational bandwidth through cleverly integrated slots and parasitic components. Maximum realized gain of 4.3 dBi in the sub-6 GHz band, 5.5 dBi in the Ku-band, and 9.9 dBi in the millimeter wave (mm-wave) band for 3D MIMO setup is ensured. In addition, the machine learning prediction is used to verify the single element realized gain, and the results demonstrate that it performs admirably with an accuracy of more than 89% using the random forest regression model throughout the entire frequency spectrum. A 6-port, one-of-a-kind MIMO design with strong diversity performance is built from the single-element configuration. This 6-port MIMO system uses a new codesign technique to achieve 360-degree coverage in the elevation and azimuth planes, exceptional isolation (21 dB at sub-6 GHz band, 25 dB at the Ku-band, and 30 dB at mm-wave band), and pattern diversity. This MIMO antenna module is a shining example of the future, with the potential to completely alter the state of affairs in terms of 5G IoT connectivity in settings such as smart homes, offices, cities, vehicle-to-everything communications, and broadcast satellite service (BSS). [ABSTRACT FROM AUTHOR]

ABSTRACT This article proposes an eight‐port octagonal‐shaped multiple‐input multiple‐output (MIMO) wideband 3D antenna system for terahertz (THz) applications. The 3D configuration of the proposed THz‐MIMO antenna is placed on a 55‐μm‐thick polyimide substrate. A modified butterfly‐shaped radiating patch and full ground plane make up the single antenna element. Every antenna element spans a wide impedance bandwidth for THz spectrums from 0.9‐ to 1.68‐THz frequency band, a frequency operating range with the highest radiation efficiency of 98% and is printed in a compact size of 130 × 110 μm2 (0.00004 λo$$ {\lambda}_o $$ × 0.00005 λo$$ {\lambda}_o $$, with respect to the lowest operating frequency). The THz‐MIMO antenna system with eight ports is composed of both symmetric and nonsymmetric array arrangements. For configurations that are symmetric or nonsymmetric, the estimated MIMO performance parameters, envelope correlation coefficient (ECC) < 0.01 within allowable bounds, diversity gain (DG) exceeding 9.99 dB, total active reflection coefficient (TARC) < −10 dB, and channel capacity loss (CCL) below 0.2 bits/s/Hz, and the exhibited gain is above 7.5 dBi. Furthermore, another approach, such as supervised regression machine learning (ML), is used to forecast antenna gain. The variance score, mean square error (MSE), root mean square error (RMSE), R square, mean squared logarithmic error (MSLE), mean absolute error (MAE), and so forth are used to gauge how well ML models perform. The accuracy of ridge regression gain prediction is approximately 98%, with errors of less than unity, which is better than the other ML models. The suggested THz‐MIMO antenna system is appropriate for the wireless communication networks operating in the sixth generation. [ABSTRACT FROM AUTHOR]

This work presents a novel RF MEMS-based pattern reconfigurable antenna capable of steering beam in three different directions. The proposed H-shaped microstrip antenna is based on the basic structure of a dipole antenna and forms an 'H' shape by combining two dipoles in reverse fashion. The proposed antenna provides pattern reconfigurability at a single resonant frequency of 1.8 GHz, that lies in L-band. The optimized simple structure of the proposed antenna allows easy incorporation of single pole single throw (SPST-RSMW101) RF MEMS switches. The antenna is simulated using electromagnetic (EM) simulators (HFSS and IE3D). The proposed antenna is fabricated on RT Duroid substrate with 2.2 dielectric constant, and 1.75 mm thickness. The ON and OFF state of RF MEMS switches enables three different scenarios of operation with peak gains of 6.25 dBi, 6.28 dBi, and 4.01 dBi respectively. For validation of pattern reconfigurability the antenna is tested using time domain antenna measurement system and found to have a good agreement with the simulated results. [ABSTRACT FROM AUTHOR]

ABSTRACT An antenna array operating at 60 GHz is proposed. The proposed array covers impedance bandwidth of 5 GHz (57.5-62.5 GHz) with maximum gain of 16.25 dBi at 61. 5 GHz. With the proposed array 15 distinct radiation patterns in azimuth plane can be achieved, each having 3-dB beamwidth of 24° and 3-dB cross over. The beam scanning capability can be achieved by activating each array element one by one. Each array element consists of a conventional microstrip patch antenna (MPA) integrated with extended hemispherical Teflon lens. The Teflon lens is utilized to enhance the gain of conventional MPA as well as to achieve the desired elementary radiation pattern of array to cover full azimuth plane. A very good agreement between the measured and simulated results is observed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:116-120, 2017 [ABSTRACT FROM AUTHOR]