Multiband antennas for GPS/GSM1800/Bluetooth/Wi-Fi smart watch applications

Author(s):  
Hong-Sheng Huang ◽  
Hsin-Lung Su ◽  
Sung-Lung Chen
Author(s):  
Ryuichi IMAI ◽  
Daisuke KAMIYA ◽  
Haruka INOUE ◽  
Shigenori TANAKA ◽  
Jun SAKURAI ◽  
...  

Author(s):  
Ruchi ◽  
Amalendu Patnaik ◽  
M. V. Kartikeyan

Abstract Designing miniaturized multiband antennas to cover both the 5G new radio frequencies (FR1 and FR2) simultaneously is a challenge for wireless communication researchers. This paper presents two antenna designs : a dual-band printed antenna of size 18 × 16 × 0.285 mm3 operating at FR1–5.8 GHz and FR2–28 GHz and a triple-band printed antenna with dimensions 30 × 25 × 0.543 mm3 operating at FR1–3.5 GHz and 5.8 GHz (sub-6 GHz microwave frequency bands) and FR2–28 GHz (mm-wave frequency band). The final projected triple-band antenna has a compact size with an impedance bandwidth of 12.71%, 11.32%, and 18.3% at 3.5 GHz, 5.8 GHz, and 28 GHz, respectively with the corresponding gain of 1.86 dB, 2.55 dB, and 4.41 dB. The measured radiation characteristics of the fabricated prototypes show that the proposed designs are suitable for trendy 5G-RFID and mobile Internet of things (IoT) applications.


2021 ◽  
Vol 77 (18) ◽  
pp. 2043
Author(s):  
Osama Tariq Niazi ◽  
Issa Ismail, BS ◽  
Nachiket Patel ◽  
Jaskanwal Bisla ◽  
Mohammad Hojjati

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
M. van Doorn ◽  
A. Popma ◽  
T. van Amelsvoort ◽  
C. McEnery ◽  
J. F. Gleeson ◽  
...  

Abstract Background The onset of mental disorders typically occurs between the ages of 12 and 25, and the burden of mental health problems is the most consequential for this group. Indicated prevention interventions to target individuals with subclinical symptoms to prevent the transition to clinical levels of disorders, even leading to suicide, have shown to be effective. However, the threshold to seek help appears to be high. Digital interventions could offer a solution, especially during the Covid-19 pandemic. This implementation study will investigate the digital indicated prevention intervention ENgage YOung people Early (ENYOY), the Dutch version of the original Moderated Online Social Therapy Platform (MOST+) from Australia. In addition, the relationship between stress biomarkers, symptoms and outcome measures of youth using the platform will be investigated in this study. Methods The MOST+ platform will be adapted, translated and developed for the situation in the Netherlands in collaboration with a Youth Panel. A prospective cohort of 125 young people (16–25 years) with beginning mental health complaints will be on the platform and followed for a year, of which 10 participants will have an additional smart watch and 10 participants will be asked to provide feedback about the platform. Data will be collected at baseline and after 3, 6 and 12 months. Outcome measures are Psychological Distress assessed with the Kessler Psychological Distress Scale (K10), Social and occupational functioning (measures by the SOFAS), positive mental health indicators measured by the Positive Health Instrument, stress biomarkers with a smart-watch, website journeys of visitors, and feedback of youth about the platform. It will be a mixed-method study design, containing qualitative and quantitative measures. Discussion This trial will specifically address young people with emerging mental health complaints, and offers a new approach for treatment in the Netherlands. Considering the waiting lists in (child and adolescent)-psychiatry and the increase in suicides among youth, early low-threshold and non-stigmatizing help to support young people with emerging psychiatric symptoms is of crucial importance. Moreover, this project aims to bridge the gap between child and adolescent and adult psychiatry. Trial registration Netherlands Trial Register ID NL8966, retrospectively registered on the 19th of October 2020.


Author(s):  
Ashwini Kotrashetti ◽  
B. K Lande ◽  
Ajay Poddar

Abstract Conventional multiband antennas suffer from strong interactions among different operating frequencies, complex configurations, low bandwidth, and reduced efficiencies. A design concept for a multibeam multiband antenna in wireless devices is proposed in this paper. The design concept provides a promising approach to augment transmission and reception. The principle of design involves a primary radiating element embedded in a triplate conformation which excites a passive array of multiple frequency secondary radiators, forming a frequency selective structure in triplate (FSST). The higher order mode behavior of the parent antenna characterizes the design of FSST placed in its nearfield. The mathematical modeling and analysis of the design methodology is also presented. As proof of concept, the proposed design methodology is validated with simulations and experiments at four unlicensed communication bands and the results are compared.


2017 ◽  
Vol 383 ◽  
pp. 166-168 ◽  
Author(s):  
Gloria Dalla-Costa ◽  
Marta Radaelli ◽  
Simona Maida ◽  
Francesca Sangalli ◽  
Bruno Colombo ◽  
...  

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