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The present paper analyses and measures the effects that the presence of a metallic surface can induce on the integrated antennae of HF RFID systems operating on a 13.56 MHz frequency. The results of the conducted measurements have been compared with those arrived at by means of the Ansoft HFSS application. Thus, the conducted tests and simulations reveal the fact that the resonant frequency increases...
The most important factors that may influence and affect the performance of HF RFID systems that use passive tags, consists in the effects of the metallic environments in the proximity of the antenna. In order to overcome a part of these issues, both the device antennas and their impedance matching units must be optimized. This paper presents a mathematical model that enables the identification of...
Increasing the efficiency and automation of lighting control systems is an important issue that has been addressed by many research centers. This paper presents the design and implementation of a lighting monitoring and control system that can be employed for street lighting control. The main advantages of this system consist in substantially reducing the costs related to energy consumption and maintenance,...
In order to reach a high performance level in a street lighting control system, two important aspects must be taken into account: the selection of the adequate communication protocol, on the one hand, and the selection of the network topology that supports the architecture, on the other hand. Given these circumstances, the present paper focuses on an assessment of the performance of the mesh and tree...
This paper approaches the issues concerning the coexistence of the Wireless Sensor Networks (WSN) IEEE 802.15.4, the IEEE 802.11g wireless networks and the ad-hoc Bluetooth networks that function within the same 2.4 GHz band. The quality of communication is assessed by analyzing the PER (Packet Error Rate) parameter. The tests are based on the worst case scenario presumption, which entails the occurrence...
Operation of RFID systems is strongly disturbed by metallic environments in the proximity of the antenna. These environments produce a detuning on the antenna, which as a side effect produce a drastic decrease in reading distance. In this paper, the authors show that it's possible to make a radical improvement on HF RFID systems performances by retuning the reader antenna to its system working frequency...
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