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A simple method to simultaneously increase the gain and bandwidth of wearable antennas for application in medical/communications systems

Published online by Cambridge University Press:  13 August 2020

Farzad Khajeh-Khalili Open the ORCID record for Farzad Khajeh-Khalili [Opens in a new window] ,
Ali Shahriari  and
Fatemeh Haghshenas
Farzad Khajeh-Khalili*
Affiliation:
Electrical Department, Kian Institute of Higher Education, Shahin Shahr, Isfahan, Iran
Ali Shahriari
Affiliation:
Electrical Department, Kian Institute of Higher Education, Shahin Shahr, Isfahan, Iran
Fatemeh Haghshenas
Affiliation:
Electrical Department, Kian Institute of Higher Education, Shahin Shahr, Isfahan, Iran
*
Author for correspondence: Farzad Khajeh-Khalili, E-mail: Khalili.farzad@gmail.com
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Abstract

In this paper, a simple and efficient method to increase the gain and bandwidth of the wearable antennas used in several medical/communications systems is presented. To increase the gain and bandwidth simultaneously, the triple transmission lines (TTLs) method has been used. With this method, the frequency ranges of 1.7–2.5 and 5.4–5.95 GHz are covered with dual-band responses. Also, the simulated maximum gain at 2 and 5.8 GHz is equal to 8.26 and 9.86 dB, respectively. Using the TTLs method, the second frequency band (5.4–5.95 GHz) is achieved. Also, the gain improvement in operating frequencies is more than 4 dB compared to the conventional antenna. The dimensions of the proposed wearable high-gain antenna are 80 × 92 × 2 mm3 or 0.57 × 0.67 × 0.01 λg3 at 2 GHz. Finally, a dual-band sample antenna for use in medical systems was fabricated with a flexible felt substrate and its characteristics were measured. There is a good fit between the measurement and simulation results.

Keywords

Antennafelthigh-gainTTLswearable
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 4 , May 2021 , pp. 374 - 380
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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