Room-Coverage Improvements in UHF RFID with Commodity Hardware [Wireless Corner]

Dimitriou, Antonis G.; Bletsas, Aggelos; Sahalos, John N.

doi:10.1109/map.2011.5773609

Cited by 21 publications

(11 citation statements)

References 19 publications

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“…In [41], [42], an analytical ray-tracing model is developed, in order to analyze the fading patterns in typical indoor WPT application-areas. Methods to improve the performance of passive UHF RFID systems are proposed.…”

Section: G Far-field Channel Modeling For Wpt Systemsmentioning

confidence: 99%

Europe and the Future for WPT : European Contributions to Wireless Power Transfer Technology

Team¹

2017

IEEE Microwave

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Section: G Far-field Channel Modeling For Wpt Systemsmentioning

confidence: 99%

Europe and the Future for WPT : European Contributions to Wireless Power Transfer Technology

Team¹

2017

IEEE Microwave

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“…Optimization of the antenna's position and tilt angle in the presence of lossy walls, fl oor/ceiling, and patient beds was carried out using an in-house-developed ray-tracing code [8,10] (see . This took into account the antenna's pattern and polarization, radiated power, multiple refl ections, edge diffraction, etc.…”

Section: System Hardware Designmentioning

confidence: 99%

“…This took into account the antenna's pattern and polarization, radiated power, multiple refl ections, edge diffraction, etc. [10]. Alternative models in the literature can be found in [11][12][13].…”

Section: System Hardware Designmentioning

confidence: 99%

“…This net work of antennas, covering a great portion of the hospital's ward, must be carefully designed, in order to provide adequate coverage and long-range readability [8]. Optimization of the precise position of the antennas within the hospital ward was achieved using effective ray-tracing models and measure ments [9,10]. Of course, there were many other issues involved in the design, such as the physical size and type of the antennas used, electromagnetic interference with other medical electronic devices, the topology of the hospital ward, and recommendations and restrictions set by the medical per sonnel of the hospital.…”

Section: Introductionmentioning

confidence: 99%

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On the Design, Installation, and Evaluation of a Radio-Frequency Identification System for Healthcare Applications [Wireless Corner]

Polycarpou

Dimitriou

Bletsas

et al. 2012

IEEE Antennas Propag. Mag.

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In this paper, we present the design, implementation, and testing of a radio-frequency identifi cation (RFID) system for healthcare applications. The constantly growing passive RFID technology at ultra-high frequencies (UHF), in conjunction with current state-of-the-art information and communication technologies (ICTs), was used for the system design. The end product was installed at an oncology hospital in Cyprus, where it was thoroughly evaluated by medical staff and hospital administrators. This pilot project had three main objectives: a) automatic and error-free patient identifi cation of in-hospital patients using RFID-enabled cards or wristbands; b) Real-time location service (RTLS) for locating and tracking medical assets and high-value equipment in the hospital ward; c) quick and hassle-free drug inventory management through the use of inexpensive smart labels and cost-effective stationary readers. Here, we present a detailed description of the three major subsystems of the pilot project, emphasizing the main features and capabilities of the system, important design and implementation issues, as well as system evaluation and testing. During the design stage of the project, special emphasis was placed on user friendliness, system capabilities, adequate coverage and tag readability, privacy and security of sensitive patient data, system reliability, and the daily practices of medical personnel and hospital administrators.

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“…In addition, harvesting the ambient power depends on the environment. On the other hand, [14][15] employed multi-transmitter or multi-antenna systems to improve the received power of certain sensors with fixed location by phase control on each antenna. Different from these researches, this paper realizes seamless coverage of energy supply field to activate all sensors distributed in the indoor environments by the multi-point wireless energy transmission with carrier shift diversity.…”

mentioning

confidence: 99%

Experiments Validating the Effectiveness of Multi-Point Wireless Energy Transmission with Carrier Shift Diversity

Maehara

Tran

Sakaguchi

et al. 2014

IEICE Trans. Commun.

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SUMMARYThis paper presents a method to seamlessly extend the coverage of energy supply field for wireless sensor networks in order to free sensors from wires and batteries, where the multi-point scheme is employed to overcome path-loss attenuation, while the carrier shift diversity is introduced to mitigate the effect of interference between multiple wave sources. As we focus on the energy transmission part, sensor or communication schemes are out of scope of this paper. To verify the effectiveness of the proposed wireless energy transmission, this paper conducts indoor experiments in which we compare the power distribution and the coverage performance of different energy transmission schemes including conventional single-point, simple multi-point and our proposed multi-point scheme. To easily observe the effect of the standing-wave caused by multipath and interference between multiple wave sources, 3D measurements are performed in an empty room. The results of our experiments together with those of a simulation that assumes a similar antenna setting in free space environment show that the coverage of single-point and multi-point wireless energy transmission without carrier shift diversity are limited by pathloss, standing-wave created by multipath and interference between multiple wave sources. On the other hand, the proposed scheme can overcome power attenuation due to the path-loss as well as the effect of standing-wave created by multipath and interference between multiple wave sources. key words: wireless sensor networks, multi-point wireless energy transmission, carrier shift diversity, indoor environment, experimental validation

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Room-Coverage Improvements in UHF RFID with Commodity Hardware [Wireless Corner]

Cited by 21 publications

References 19 publications

Europe and the Future for WPT : European Contributions to Wireless Power Transfer Technology

Europe and the Future for WPT : European Contributions to Wireless Power Transfer Technology

On the Design, Installation, and Evaluation of a Radio-Frequency Identification System for Healthcare Applications [Wireless Corner]

Experiments Validating the Effectiveness of Multi-Point Wireless Energy Transmission with Carrier Shift Diversity

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