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A proximity sensor is designed as an antenna-based sensor, operating at 2.4 GHz. The operating principle relies on the fact that when an object approaches an antenna, it affects its radiation properties and its input impedance. A diode power detector is used to sense the antenna input impedance variation as a reflected wave at the input terminals of the antenna. The detector output analog dc voltage...
This paper presents the guidelines for the development and optimization of wireless sensors based on the modulated scattering technique (MST). In particular, this paper is focused on the design and optimization of different MST tag prototypes with different modulation techniques. In addition, it is shown how to obtain the best performance of such sensors in terms of communication range and load efficiency...
Wireless sensing constitutes a broad investigation area for many relevant applications. This paper reviews and compares different approaches under a methodology viewpoint. A unified analytical formulation allows to address sensitivity issues and to provide some guidelines in view of further numerical-based optimization. Whilst RFID technology represents an attractive solution, reflectometer techniques,...
The paper presents the design, realization and measurement of micro magnetic antennas for the construction of wireless sensors and active RFID components. Small magnetic antennas are suitable for applications requiring the transmission through a dissipative medium. Furthermore, they exhibit a good omnidirectional radiation diagram and, especially for sensing applications, small antennas are necessary...
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