Document Type : Original Article
Authors
1 PhD student in Semnan University of Electrical and Electronic Engineering
2 Faculty of Electrical Engineering, University of Research Sciences, Tehran, Iran
3 Assistant Prof., khatam al-anbia (pbuh) University, Tehran, Iran
4 Instructor, khatam al-anbia (pbuh) University, Tehran, Iran
Abstract
Today, there is a growing trend in the public health sector to use smart technologies for monitoring and tracking purposes in military and defense systems. In this article, the construction of a wearable antenna in non-medical bands has been investigated. To study near-body antennas in terms of effects and proper performance, this work uses a multi-layer phantom. The design of the miniature antenna in four frequency bands has been done in the first proposed model and the construction of the single band antenna for the 2.4 GHz ISM band has been done in the second design. Our goal is to design efficient miniaturized antennas through miniaturization techniques, i.e. using orthogonal structure and increasing path length. The user safety check of the antenna shows that the SAR is within the standard range. To achieve the design objective, a linear polarization winding structure is presented. The connection inside, outside and inside the body with linear antenna is the purpose of proposing meandering structures. The prepared antenna works in the frequency range of 2.4 to 2.5 GHz. A comparison of the results shows a good overlap between the measured and simulated results. The fabricated miniature antenna also provides a gain in the range of 0.56 to 2dBi. The efficiency obtained in the design of two antennas is more than 90%.
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