Edge Deep Learning and Computer Vision-Based Physical Distance and Face Mask Detection System Using Jetson Xavior NX

This paper proposes a fully automated vision-based system for real-time COVID-19 personal protective equipment detection and monitoring. Through this paper, we aim to enhance the capability of on-edge real-time face mask detection as well as improve social distancing monitoring from real-live digital videos. Using deep neural networks, researchers have developed a state-of-the-art object detector called "You Only Look Once Version Five" (YOLO5). On real images of people wearing COVID19 masks collected from Google Dataset Search, YOLOv5s, the smallest variant of the object detection model, is trained and implemented. It was found that the Yolov5s model is capable of extracting rich features from images and detecting the face mask with a high precision of better than 0.88 mAP_0.5. This model is combined with the Density-Based Spatial Clustering of Applications with Noise method in order to detect patterns in the data to monitor social distances between people. The system is programmed in Python and implemented on the NVIDIA Jetson Xavier board. It achieved a speed of more than 12 frames per second. Doi: 10.28991/ESJ-2023-SPER-05 Full Text: PD

Ten antenna array using a small footprint capacitive-coupled-shorted loop antenna for 3.5 GHz 5G smartphone applications

ABSTRACT: A self-isolated 10-element antenna array operating in the long-term evolution 42 (LTE42) frequency band is proposed for 5G massive MIMO smartphone applications. The proposed antenna elements are placed in a 2D array configuration; they are placed symmetrically along the two long edges of the mobile chassis. The proposed antenna structure is a shorted loop antenna resonating at half-wavelength mode, which is rarely deployed by researchers due to its large size compared to other quarter wavelength antenna structures. It is a printed, shorted, and compact loop antenna of a total footprint area of 6 × 6.5 mm2 (λ/14.3 ×λ/13.2, where λ is the free space wavelength at 3.5 GHz). A small capacitive coupling flag-shaped strip is used to excite the proposed loop antenna. The compactness is achieved using an inward meandering that forms an internal loop in the element. The position and the dimensions of this loop are used to tune the resonant frequency and matching level at 3.5 GHz. The results (theoretical, simulated, and measured) show that the 3.5 GHz band (3.4-3.6 GHz) is achieved with impedance matching better than −10 dB, and total efficiency higher than 65%. A 10 × 10 MIMO system is formed and it has an excellent MIMO and diversity performance in-terms of the envelope correlation coefficient (below 0.055), and apparently it has the highest channel capacity (about 54.3 bps/Hz) among other MIMO systems of the same order. Simulation results of the specific absorption rate (SAR) demonstrates that the proposed antenna solution satisfied SAR criterion. Thus, the proposed ten-element MIMO antenna represent an excellent candidate for sub-6 GHz 5G smartphone applications

A low-profile holographic antenna with dual-metasurface and printed Yagi feed

A low-profile microwave holographic antenna comprised of a dual-metasurface and an integrated printed Yagi feed is presented. The proposed design utilizes two metasurfaces with an aperture size of 0.0134 m2, with no ground plane, to produce a single pencil beam normal to the plane of the Yagi feed. The holographic antenna is designed at a centre frequency of 20 GHz and shown to have an excellent performance in the frequency range 19.75–21.25 GHz. The aperture efficiency and 1 dB gain bandwidth achieved are 28% and 7.5%, respectively. This is an improved aperture efficiency/bandwidth combination over that of comparable low-profile holographic antennas. Simulated and measured results demonstrate the advantages of the proposed design

Compact low-profile dual-port single wideband planar inverted-F MIMO antenna

This letter presents a very simple low-profile and compact single-element two-port planar inverted-F antenna (PIFA) with applications in Wireless Local Area Networks (WLAN) and Long Term Evolution (LTE) bands. The two feeding plates are placed perpendicular to each other where polarization diversity is exploited due to the fact that the two ports are cross-polarized. To isolate the two feeding ports, a slot is etched on the ground plane. This single-element PIFA has a height of h=5 mm, which makes it suitable for handheld applications and covers a wide frequency band from around 2.1 to 2.9 GHz for dB, therefore having applications in WLAN (2.45 GHz) and LTE and Worldwide Interoperability for Microwave Access (WiMAX) band (2.5-2.7 GHz), and can be used as a 4G terminal antenna for diversity and multiple-input-multiple-output (MIMO) applications