778 research outputs found
A pocket-integrated miniature, dual-band, and high gain textile MIMO antenna for 5G and WiFi wearable applications
Full text linkThis paper reports a miniature low-profile denim textile 2-port MIMO (multiple-input-multiple-output) antenna for dual-bands: 5G sub-6 3.5 GHz and Wi-Fi 5.2 GHz wearable applications. This MIMO antenna has impedance bandwidths and peak gain of 310 MHz and 8.3 dBi and 950 MHz 13.0 dBi at 3.5 and 5.2 GHz, respectively. This MIMO antenna has a compact area of 0.078 λ02, with both antenna elements of the MIMO being a modified elliptical patch, L-shaped stubs for impedance matching, and a circular decoupling ring to achieve > 25 dB port isolation. The designed antenna is very tiny and integrated into the shirt's pocket. It is tested in two positions, i.e., hidden (integrated inside the pocket, for example, military applications) and visible (when integrated on the pocket surface for conventional communication). Moreover, the antenna's working is analyzed in these positions (hidden and visible), and it was found that it functions well in both 5G sub-6 GHz and Wi-Fi frequency bands with nearly close gain values and communication range. This MIMO antenna has a very small ECC (envelope correlation coefficient) of 0.006/0.002 in both frequency bands, which shows high channel isolation. The 1 gm/10 gm SAR (specific absorption rate) values at 3.5 and 5.2 GHz are 0.034/0.057 and 0.026/0.0132 W/Kg, respectively, substantially lesser than the recommended values of FCC/ICNIRP
A Compact Wearable Textile Antenna for NB-IoT and ISM Band Patient Tracking Applications
Full text linkThis paper proposes a novel multi-band textile monopole antenna for patient tracking applications. The designed antenna has compact footprints (0.13 lambda 02) and works in the narrow band-internet of things (NB-IoT) 1.8 GHz, radio frequency identification (RFID), and industrial, scientific, and medical (ISM) 2.45 GHz and 5.8 GHz bands. The impedance bandwidths and gain of the antenna at 1.8 GHz, 2.45 GHz, and 5.8 GHz are 310 MHz, 960 MHz, and 1140 MHz; 3.7 dBi, 5.3 dBi, and 9.6 dBi, respectively. Also, the antenna's behavior is checked on different body parts of the human body in various bending scenarios. As per the evaluated link budget, the designed antenna can easily communicate up to 100 m of distance. The specific absorption rate values of the designed antenna are also within acceptable limits as per the (FCC/ICNIRP) standards at the reported frequency bands. Unlike traditional rigid antennas, the proposed textile antenna is non-intrusive, enhancing user safety and comfort. The denim material makes it comfortable for extended wear, reducing the risk of skin irritation. It can also withstand regular wear and tear, including stretching and bending. The presented denim-based antenna can be seamlessly integrated into clothing and accessories, making it less obtrusive and more aesthetically pleasing
sj-pdf-1-ijq-10.1177_16094069221093139 – Supplemental Material for Protocol of Process Evaluation of Secondary Prevention by Structured Semi-Interactive Stroke Prevention Package in India (SPRINT INDIA)Trial
No full textSupplemental Material, sj-pdf-1-ijq-10.1177_16094069221093139 for Protocol of Process Evaluation of Secondary Prevention by Structured Semi-Interactive Stroke Prevention Package in India (SPRINT INDIA)Trial by Shweta J. Verma, Puja Gulati, Himani Khatter, Deepti Arora, Aneesh Dhasan, Meenakshi Sharma, P. N. Sylaja and Jeyaraj D. Pandian in International Journal of Qualitative Methods</p
Food Security in South Asia : Issues and Opportunities
Full text linkFood security is defined as economic access to food along with food production and food availability. Agriculture in the SAR (South Asian Region) is caught in a low equilibrium trap with low productivity of staples, supply shortfalls, high prices, low returns to farmers and area diversification - all these factors can be a threat to food security. South Asia still has the highest number of people (423 millions) living on less than one dollar a day. The region has the highest concentration of undernourished (299 million) and poor people with about 40 per cent of the worlds hungry. Despite an annual 1.7 per cent reduction in the prevalence of undernourishment in the region in the past decade, the failure to reduce the absolute number of the undernourished remains a major cause for concern. Estimates by the Food and Agricultural Organisation (FAO) indicate that by 2010, Asia will still account for about one-half of the worlds undernourished population, of which two-thirds will be from South Asia. Though SAARC countries have established a food bank to meet the needs of food security in the region, it has not been operational even during times of crisis. This is despite the felt need of member nations to evolve mechanisms to make the SAARC Food Security Reserve operational. It is against this background that this study has been undertaken. Conducted in collaboration with think-tanks from South Asian countries, it aims to identify issues relating to food security, the policy initiatives taken to tackle these issues, evaluate these policies and suggest measures to overcome identified constraints in order to improve the food security situation in the region.South Asia, food security, Safety Nets, Food Bank
Structure and Properties of Vortex-Spun Yarns & Fabrics-A Review
No full textDeepti Sharma* & DhirendraSharm
Low-loss MIMO antenna wireless communication system for 5G cardiac pacemakers
Full text linkCardiovascular diseases (CVDs) are one of the leading causes of death globally. The Internet of things (IoT) enabled with industrial, scientific, and medical (ISM) bands (2.45 and 5.8 GHz) facilitates pacemakers to remotely share heart health data to medical professionals. For the first time, communication between a compact dual-band two-port multiple-input-multiple-output (MIMO) antenna (integrated inside the leadless pacemaker) and an outside-body dual-band two-port MIMO antenna in the ISM 2.45 and 5.8 GHz frequency bands is demonstrated in this work. The proposed communication system offers an attractive solution for cardiac pacemakers as it can operate on a 5G IoT platform while also being compatible with existing 4G standards. The experimental verification of the proposed MIMO antenna low-loss communication capability is also presented by comparing it to the existing single-input-single-output communication between the leadless pacemaker and outside body monitoring device
Students
No full textW&L Law students Deepti Sharma, Liz Farrell, and Jessica Girvan enjoying the celebration.https://scholarlycommons.law.wlu.edu/scholarcelebration2013/1012/thumbnail.jp
Design and implementation of compact dual-band conformal antenna for leadless cardiac pacemaker system
Full text linkThe leadless cardiac pacemaker is a pioneering device for heart patients. Its rising success requires the design of compact implantable antennas. In this paper, we describe a circularly polarized Hilbert curve inspired loop antenna. The proposed antenna works in the WMTS (Wireless Medical Telemetry Services) 1.4 GHz and ISM (Industrial, Scientific, and Medical) 2.45 GHz bands. High dielectric constant material Rogers RT/Duroid 6010 LM ([Formula: see text]=10) and fractal geometry helps to design the antenna with a small footprint of 9.1 mm3 (6 mm × 6 mm × 0.254 mm). The designed antenna has a conformal shape that fits inside a leadless pacemaker's capsule is surrounded by IC models and battery, which are tightly packed in the device enclosure. Subsequently, the integrated prototype is simulated deep inside at the center of the multi-layer canonical heart model. To verify experimentally, we have put dummy electronics (IC and battery) inside the 3D printed pacemaker's capsule and surfaced the fabricated conformal antenna around the inner curved body of the TCP (Transcatheter Pacing) capsule. Furthermore, we have tested the TCP capsule by inserting it in a ballistic gel phantom and minced pork. The measured impedance bandwidths at 1.4 GHz and 2.45 GHz are 250 MHz and 430 MHz, whereas measured gains are - 33.2 dBi, and - 28.5 dBi, respectively
Low frequency dielectric dispersion study of PVC-PPy blends in dilute solution of different solvents
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