36 research outputs found
Twin Grid-array as 3.6 GHz Epidermal Antenna for Potential Backscattering 5G Communication
Emerging 5G infrastructures can boost innovative paradigms for future wearable and epidermal devices exploiting low-power (even passive) wireless backscattering-based communication. To compensate high body- and path-losses, and to extend the read range, array configurations are required. This work proposes a flexible monolithic epidermal layout, based on Krauss array concept, that operates at 3.6 GHz and it is suitable to be directly attached to the human body. The antenna involves a dual grid configuration with a main radiating grid backed by a grid reflector placed in touch with the skin. Overall, the amount of conductor an dielectric substrate are minimized with benefit to breathability. The antenna is suitable to surface feeding and produces a broadside radiation. Parametric analysis are performed and an optimal configuration of four-cells grid is derived and experimentally demonstrated to provide a maximum
gain of more than 6 dBi
Multi-chip RFID Tags integrating Shape-memory Alloys for Temperature Sensing
This paper proposes a dual-chip UHF tag embedding
Shape Memory Alloys (SMA) able to tranform the variation
of the tagged item’s temperature into a permanent change of
antenna radiation features. This event-driven antenna is hence
able to selectively activate the embedded microchips according
to the temperature above or below a given threshold. A general
design methodology for the resulting two-ports tag antenna is
here introduced and then applied to prototypes able to work at
low (around 0â—¦C) and high (80â—¦C) temperatures. The devices
has clear applications in supply chain management as well as
general safety assessment
NIGHT-Care: A Passive RFID System for Remote Monitoring and Control of Overnight Living Environment
AbstractAn Ambient Intelligence platform, NIGHTCare, for remote monitoring and control of overnight living environment is here proposed. The platform, entirely based on RFID passive technology is able to recognize nocturnal behaviors and activities, generates automatic alarms in case of anomalous or pathological events and support diagnostics. The results of a complete test in real scenario are presented, together with a numerical assessment of electromagnetic safety issues
Optimization of multichip RFID tag antenna with genetic algorithm and method of moments
A specific procedure is implemented for the optimization of passive part of multichip RFID tag antenna, based on the performance parameter in terms of newly developed concepts. Examples are given and significant improvements have been observed comparing with previous results, which verifies the approach