The design of an eight-element H-shaped dual-band multiple-input multiple-output (MIMO) antenna system for sub-6 GHz fifth-generation (5G) smartphone applications is presented in this work. The radiating elements are designed on the side edge frame of the smartphone, placed on both sides of the main printed circuit board (PCB). Each side edge consists of four radiating elements, which ensures low mutual coupling between antenna elements. The total size of the main PCB is $150\times 75$ mm ² , while the size of the side edge frame is $150\times 7$ mm ² . A single antenna consists of an H-shaped radiating element fed using a $50\Omega $ microstrip feeding line designed on the main board of the smartphone. The results show that, according to −6 dB impedance bandwidth criteria, the designed MIMO antenna radiates at two different frequency ranges within the allocated 5G spectrums, i.e., 3.1–3.78 GHz and 5.43–6.21 GHz with 680 MHz and 780 MHz bandwidths, respectively. It is also observed that the antenna elements are able to provide pattern diversity for both the frequency bands. Furthermore, an isolation of >12 dB is observed between any two given radiating elements. Numerous MIMO critical performance characteristics are assessed, including diversity gain (DG), envelope correlation coefficient (ECC), and channel capacity (CC). A prototype is built, measured, and it is observed that the measured and simulated data correspond well. On the basis of performance characteristics, it can be claimed that the suggested MIMO system may be used in 5G communication networks.

The performance of multiphase pumps has a remarkable influence on the related industrial application. In order to understand the flow field and gas-liquid phase interaction characteristics of a multiphase rotodynamic pump, detailed numerical analysis of the pump with a medium of air-water combination was carried out for the whole flow passage by means of a structured mesh using ICEM_CFD and TurboGrid. The results for 21% inlet gas void fraction (IGVF = 21%) condition showed that the magnitude ratio of non-drag forces to drag in impeller and guide vane passages was generally less than 1, whereas it was always less than 0.2 for the magnitude ratio of turbulent dispersion force to drag. When the IGVF was increased, the variation range of interphase forces in the impeller was greater than that in the guide vane. In addition, the gas in the impeller mainly accumulated near the suction surface in the outlet region. Further, with increased IGVF, the degree of aggregation increased as well as the gas inhomogeneity, and consequently the interphase forces in the impeller increased. Due to the divergent structure of the guide vane, obvious vortexes emerged at the hub and gradually moved toward the blade pressure surface along the streamwise direction.

The demand for low-cost healthcare solutions has been increasing and the use of Internet of Things (IoT) devices is becoming more common. IoT devices have the potential to monitor vital health parameters of patients remotely, providing early detection of health problems and reducing medical costs. Chipless RFID sensors, combined with IoT technology, offer cost-effective solutions for healthcare applications. These sensors have significance for remote data collection, object tracking, authentication, and security. In recent years, there has been a growing attention on the design and development of chipless sensors for monitoring health. This paper provides an extensive review of chipless RFID sensors, including their functioning, fabrication techniques, and classifications. The paper further addresses the various smart sensing materials used in chipless RFID sensors, along with challenges and future trends. The IoT-based health monitoring system permits patients to be tracked 24/7 and provides rapid health consultations from doctors in distant places. The technology also allows guardians or family members to remotely monitor patients, which is regarded as one of the most significant benefits of saving human lives. Overall, this review article provides a comprehensive investigation of the potential advantages of chipless RFID sensors and IoT-based systems for healthcare monitoring, paving the way for cost-effective, easily accessible, and reliable healthcare solutions.

This paper establishes a novel holistic T-shape roundabout coordination system (TCS) that addresses the connected and automated vehicles (CAVs) flow at a typically isolated T-shape roundabout. The TCS optimizes the states of each approaching vehicle to the roundabout in a receding horizon control framework that aims to minimize the total delay time, and ensures the smooth crossing. The optimized states are broadcasted immediately by TCS, enabling the CAVs to form a cluster and tune their speed to transit the roundabout with negligible stop-delay. We evaluate the effectiveness of the proposed TCS method under the various traffic flow demand. From the executed simulation, it is observed that the optimization process usually improves the vehicle’s average speed and reduces both the traffic density and idling. As a consequence, the fuel consumption of each vehicle around the roundabout is also reduced. Finally, these outputs are compared with the traditional method, showing that the roundabout performance significantly improves in the case of the proposed scheme, and vehicles have rapid optimization for a smooth crossing.

— This paper presents an essential technique for acquiring multi-GNSS signals using FFT. The fundamental approach of multi-GNSS satellite navigation is that the navigation information...