UHF RF Identification of People in Indoor and Open Areas

Abstract

The performance of an ultra-high-frequency RF identification (ID) system operating at 869 MHz, intended for the ID of persons in both indoor and open areas, has been validated using the propagation models, as well as the series of practical measurements. A two-ray propagation model and the 3-D ray-tracing model were used for calculations of all important system parameters in open and indoor areas, respectively. For the application mentioned above, a novel (electrically small and, at the same time, low-profile) wearable TAG antenna was designed. It was used in order to carry out the necessary tests as well. The antenna in question is based on an artificial-like surface. The latter provides an important screening effect and avoids detuning. Another virtue of the surface used is represented by the fact that it ensures the minimum loss of the antenna efficiency (resulting from the presence of a nearby human body). The simulations and measurements show that the optimized system can guarantee a reliable ID at distances up to 9 m in open areas and up to 16 m in corridors.Index Terms-Artificial surface, electrically small antenna, identification (ID) of people, loop antenna, RF identification (RFID) system, TAG antenna.

Feasibility of Body-Centric Systems Using Passive Textile RFID Tags

“…To improve polarization matching, the PIFA was oriented so that its polarization vector was always parallel to that of the tags in all the experiments. During the measurements, the volunteer took twenty different "static" (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) and "moving" (15-16) pos tures, illustrated in Figure 9. The last four positions corre sponded to the subject lying on the ground and could be repre sentative of particularly dangerous situations, such as fainting or accidents.…”

“…In some applications, the tag device -comprising an antenna integrated with a microchip transponder, and eventually with additional sensors or actuators -needs to be worn on the human body [7][8][9][10][11][12][13]. Tags integrated into clothes could work as a body-centric passive RFID system, able to track people's position and/or to monitor life parameters, all the time and everywhere.…”

“…First experimental results may be found in [10,11] concerning the identifi cation of runners in an outdoor area, also taking into account the shadowing effects in the case of formations or grouping. In [24], the power required to establish an RFID link with a human body during sleep movements of the limbs was investigated.…”

Feasibility of backscatter RFID systems on the human body

“…These characteristics are investigated in this contribution which studies the feasibility of four different backscatter RFID systems in a WBAN. http://jes.eurasipjournals.com/content/2013/1/2 Previous studies on UHF RFID-based WBANs have focused on in-body [7][8][9] and off-body [10][11][12] communication systems. So far, the investigation of backscatter communication systems on the human body has received less attention in the literature.…”

Application of Monte Carlo Method for Determining the Interrogation Zone in Anticollision Radio Frequency Identification Systems

“…Current problems that occur in the field of anticollision Radio Frequency IDentification (RFID) prototype systems are solved in experimental way (De Blasi et al, 2010;Lehto et al, 2009;Polivka et al, 2009;Brown, 2007;Clarke et al, 2006;Penttilä et al, 2006;Jones & Chung, 2007). The low efficiency coefficient of identification for the multiple objects localized in the space Ω ID doesn't allow to realize practical projects, such as, the identification of Fast Moving Consumer Goods (FMCG) - Fig.…”