Analysis of Bending and Human Body Effects on Sleeve-Badge Textile Antenna Performance

2019 ◽  
Author(s):  
Khandker Shafaet-Uz-Zaman ◽  
Mohammad Abdul Matin
Keyword(s):  
Human Body ◽  
Antenna Performance ◽  
Textile Antenna

scholarly journals FRACTAL KOCH MULTIBAND TEXTILE ANTENNA PERFORMANCE WITH BENDING, WET CONDITIONS AND ON THE HUMAN BODY

2013 ◽  
Vol 140 ◽  
pp. 633-652 ◽  
Author(s):  
Mohd Ezwan Bin Jalil ◽  
Mohamad Kamal Abd Rahim ◽  
Noor Asmawati Samsuri ◽  
Noor Asniza Murad ◽  
Huda Abdul Majid ◽  
...  
Keyword(s):  
Human Body ◽  
Antenna Performance ◽  
Textile Antenna

scholarly journals Evaluation of a Textile PIFA for Wearable IoT Application and its Challenges

2021 ◽  
Vol 15 (3) ◽  
pp. 289-302
Author(s):  
Hadi Aliakbarian ◽  
Azadeh Hajiahmadi ◽  
Nordiana Mohamad Saaid ◽  
Ping Jack Soh
Keyword(s):  
Human Body ◽  
Ground Plane ◽  
The Body ◽  
Link Quality ◽  
Test Case ◽  
Antenna Performance ◽  
Textile Antenna ◽  
Close Proximity ◽  
Transceiver Module ◽  
Conductive Textile

The ever increasing use of body-worn systems in the Internet of Things application such as needs better antenna subsystem designs compatible with its requirements. Several challenges limiting the performance of a body-worn system, from materials, and environmental conditions  to the effects of on body application and its hazards are discussed. As a test case, a flexible textile planar inverted-F antenna is presented and discussed. The choice of this topology is due to its simplicity in design and fabrication, relatively broad bandwidth and the presence of a rear ground plane, which minimizes the impacts of the human body on the antenna performance. It is designed on a felt substrate, whereas Aaronia-shield conductive textile is utilized as its  conductive parts (radiator, shorting wall and ground plane). The antenna performance are studied in two cases, first in free space and then in bent conditions in the close proximity to the human body. The influence of the relative humidity on the textile antenna performance is also investigated numerically. Simulated and measured results indicated good agreements. Finally, the proposed antenna is integrated with a transceiver module and evaluated on the body in practice. Its wireless link quality is assessed in an indoor laboratory.

scholarly journals Wireless Body Area Networks: UWB Wearable Textile Antenna for Telemedicine and Mobile Health Systems

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 558 ◽  
Author(s):  
Ashok Yadav ◽  
Vinod Kumar Singh ◽  
Akash Kumar Bhoi ◽  
Gonçalo Marques ◽  
Begonya Garcia-Zapirain ◽  
...  
Keyword(s):  
Health Systems ◽  
Mobile Health ◽  
Human Body ◽  
Radiation Effects ◽  
Analytical Investigation ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Textile Antenna ◽  
Mobile Health Systems ◽  
The Time Domain

A compact textile ultra-wideband (UWB) antenna with an electrical dimension of 0.24λo × 0.24λo × 0.009λo with microstrip line feed at lower edge and a frequency of operation of 2.96 GHz is proposed for UWB application. The analytical investigation using circuit theory concepts and the cavity model of the antenna is presented to validate the design. The main contribution of this paper is to propose a wearable antenna with wide impedance bandwidth of 118.68 % (2.96–11.6 GHz) applicable for UWB range of 3.1 to 10.6 GHz. The results present a maximum gain of 5.47 dBi at 7.3 GHz frequency. Moreover, this antenna exhibits Omni and quasi-Omni radiation patterns at various frequencies (4 GHz, 7 GHz and 10 GHz) for short-distance communication. The cutting notch and slot on the patch, and its effect on the antenna impedance to increase performance through current distribution is also presented. The time-domain characteristic of the proposed antenna is also discussed for the analysis of the pulse distortion phenomena. A constant group delay less than 1 ns is obtained over the entire operating impedance bandwidth (2.96–11.6 GHz) of the textile antenna in both situations, i.e., side by side and front to front. Linear phase consideration is also presented for both situations, as well as configurations of reception and transmission. An assessment of the effects of bending and humidity has been demonstrated by placing the antenna on the human body. The specific absorption rate (SAR) value was tested to show the radiation effect on the human body, and it was found that its impact on the human body SAR value is 1.68 W/kg, which indicates the safer limit to avoid radiation effects. Therefore, the proposed method is promising for telemedicine and mobile health systems.

scholarly journals Design of Cavity-Backed Bow-Tie Antenna with Matching Layer for Human Body Application

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4015 ◽  
Author(s):  
Jeong ◽  
Park ◽  
Lee
Keyword(s):  
Reflection Coefficient ◽  
Human Body ◽  
Electromagnetic Interference ◽  
Impedance Matching ◽  
Human Head ◽  
Impedance Match ◽  
Broadband Antenna ◽  
Matching Layer ◽  
Antenna Performance ◽  
Bow Tie

This paper presents the broadband antenna for the microwave radiometric sensing of internal body temperature. For broadband operation, the bow-tie antenna was designed and backed with a cylindrical cavity, which decreased environmental electromagnetic interference and also improved the directivity of the antenna. The broadband impedance-transforming balun in microstrip form was also designed to feed the bow-tie antenna, and was located inside the cavity. An impedance-matching dielectric layer (IMDL) was introduced on top of the bow-tie antenna, for impedance match with the human body with high permittivity. The fabricated antenna was measured in free space with the IMDL removed, showing an input reflection coefficient lower than −10 dB from 2.64 to > 3.60 GHz with antenna gain over 6.0 dBi and radiation efficiency over 74.7% from 2.7 to 3.5 GHz. The IMDL was re-installed on the cavity-backed bow-tie antenna to measure the antenna performance for the human head with relative permittivity of about 40. The measured reflection coefficient was as low as −28.9 dB at 2.95 GHz and lower than −10 dB from 2.65 to > 3.5 GHz. It was also shown that the designed antenna recovered a good impedance match by adjusting the permittivity and thickness of the IMDL for the different parts of the human body with different permittivities.

scholarly journals Measurement and Performance of Textile Antenna Efficiency on a Human Body in a Reverberation Chamber

2013 ◽  
Vol 61 (2) ◽  
pp. 871-881 ◽  
Author(s):  
Stephen J. Boyes ◽  
Ping Jack Soh ◽  
Yi Huang ◽  
Guy A. E. Vandenbosch ◽  
Neda Khiabani
Keyword(s):  
Human Body ◽  
Reverberation Chamber ◽  
Antenna Efficiency ◽  
Textile Antenna ◽  
And Performance
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