Research Article RFIDDouble-LoopTagswithNovelMeanderingLinesDesignfor Health Monitoring Application Ibtissame Bouhassoune , 1 Rachid Saadane, 2 and Khalid Minaoui 1 1 LRIT Laboratory, Faculty of Science, Mohammed V University, Rabat, Morocco 2 SIRC/LaGeS-EHTP, EHTP Km 7 Route El Jadida, Oasis, Morocco Correspondence should be addressed to Ibtissame Bouhassoune; i.bouhassoune@gmail.com Received 24 March 2019; Revised 16 July 2019; Accepted 25 August 2019; Published 1 October 2019 Guest Editor: Sandra Costanzo Copyright©2019IbtissameBouhassouneetal.isisanopenaccessarticledistributedundertheCreativeCommonsAttribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In this paper, we propose a design of two compact and miniaturized RFID epidermal tags in the UHF band for health monitoring applications. e two conceptions of meandered double-loop antennas with T-match configuration, namely, a double-loop antenna with meandered line in the horizontal direction and a double-loop antenna with meandered lines in two directions, are placed at very close distance from the human body. e proposed tags are composed of bio-silicone substrate, to protect the human skin from the electromagnetic waves, and a copper conductor loaded by T-match configuration, to suit the complex impedance of the antenna to that of the chip. We have performed numerical simulations of these conceptions of two tags using the HFSS and CSTsolvers. Our results show two optimal sizes with a high communication performance, good matching features, and a large read range. We placed afterwards these two optimized tags in an elliptical environment to test their flexibility and examine their performance on different parts of the human body. 1.Introduction One of the most striking evolutions of radiofrequency identification (RFID) is manifested in the epidermal RFID family for human health monitoring applications and in- door/outdoor tracking systems. is new RFID technology plays two roles, the first one is to identify different objects, and the second one is to sense physiological parameters of the human body (temperature, pressure, heartbeat, etc.). erefore, the healthcare system can be highly developed and monitored in the long term. e RFID system is composed of remote tags and in- terrogators or readers devices. e former has the poten- tiality to properly collect the energy from the readers and store the data in the microchip, while the latter transmit and receive the radio waves to communicate with tags [1] (see Figure 1). e RFID tags can be passive without an internal power source, collecting energy from the interrogator, or semi- passivewhenabatteryisusedonlytopowerandrunthechip or other electronic components, and can be active when the tag has its own local alimentation system, which directly feeds a tag chip and the transmitting radio channel [2]. e epidermal RFID tags are placed in direct touch with human skin, and fabricated with a very thin, flexible, and biocompatible material, acting as an insulator between the conductor/electronic components and the skin. However, the cohabitation of passive tag elements with the human skin represents a complex challenge due to high losses in human tissues which strongly affect the general properties of the antenna. e electromagnetic waves emitted by the reader are either reflected or absorbed by the human tissue, and therefore, the performance of the wireless communication diminishes [3]. Most of the scientific researchers presented until now have been oriented to integrate the antenna with the lossy body, while maintaining the best characteristics of the antenna. e epidermal RFID technology has been focused first on the near field, at 13.56 MHz (HF RFID), thanks to its insensitivity to the presence of living tissues and its Hindawi International Journal of Antennas and Propagation Volume 2019, Article ID 5076139, 12 pages https://doi.org/10.1155/2019/5076139