Microelectronics‐Free, Augmented Telemetry from Body‐Worn Passive Wireless Sensors

2021 ◽  
Vol 6 (4) ◽  
pp. 2001127
Author(s):  
Amirhossein Hajiaghajani ◽  
Peter Tseng
Keyword(s):  
Wireless Sensors ◽  
Passive Wireless Sensors

scholarly journals Implementation of Simultaneous Multi-Parameter Monitoring Based in LC-Type Passive Wireless Sensing with Partial Overlapping and Decoupling Coils

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5183
Author(s):  
Juan Ignacio Sancho ◽  
Noemí Perez ◽  
Joaquin De Nó ◽  
Jaizki Mendizabal
Keyword(s):  
Remote Sensing ◽  
Wireless Sensors ◽  
Mutual Coupling ◽  
The Other ◽  
Wireless Sensing ◽  
Passive Wireless Sensors ◽  
Parameter Monitoring

Inductor–capacitor (LC) passive wireless sensors are widely used for remote sensing. These devices are limited in applications where multiparameter sensing is required, because of the mutual coupling between neighboring sensors. This article presents two effective decoupling techniques for multiparameter sensing, based on partially overlapped sensors and decoupling coils, which, when combined, reduce the mutual coupling between sensors to near zero. A multiparameter LC sensor prototype with these two decoupling mechanisms has been designed, simulated, and measured. This prototype is capable of simultaneously measuring four parameters. The measurements demonstrate that the changes in capacitance in one individual sensor do not affect the measurements of the other sensors. This principle has been applied to simultaneous wear sensing using four identical wear sensors.

Simultaneous Remote Sensing of Temperature and Humidity by LC-Type Passive Wireless Sensors

2015 ◽  
Vol 24 (4) ◽  
pp. 1117-1123 ◽  
Author(s):  
Qing-Ying Ren ◽  
Li-Feng Wang ◽  
Jian-Qiu Huang ◽  
Cong Zhang ◽  
Qing-An Huang
Keyword(s):  
Remote Sensing ◽  
Wireless Sensors ◽  
Temperature And Humidity ◽  
Passive Wireless Sensors

scholarly journals Long Range Passive RADAR Interrogation of Subsurface Acoustic Passive Wireless Sensors Using Terrestrial Television Signals

2020 ◽  
Vol 20 (13) ◽  
pp. 7156-7160
Author(s):  
Melvin Paquit ◽  
Lilia Arapan ◽  
Weike Feng ◽  
Jean-Michel Friedt
Keyword(s):  
Long Range ◽  
Wireless Sensors ◽  
Passive Radar ◽  
Passive Wireless Sensors

An Impedance Matching Method for LC Passive Wireless Sensors

2020 ◽  
Vol 20 (22) ◽  
pp. 13833-13841
Author(s):  
Ming-Zhu Xie ◽  
Li-Feng Wang ◽  
Bin-Bin Zhou ◽  
Qing-An Huang
Keyword(s):  
Wireless Sensors ◽  
Impedance Matching ◽  
Matching Method ◽  
Passive Wireless Sensors

scholarly journals Wireless Readout of Multiple SAW Temperature Sensors

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3077 ◽  
Author(s):  
Gudrun Bruckner ◽  
Jochen Bardong
Keyword(s):  
Gas Sensors ◽  
Wireless Sensors ◽  
Temperature Sensors ◽  
Industrial Applications ◽  
Delay Lines ◽  
Saw Devices ◽  
Temperature And Pressure ◽  
Identification Tags ◽  
Passive Wireless Sensors ◽  
Physical Quantities

It has since long been known that surface acoustic wave (SAW) devices, resonators as well as delay lines, can be used as passive wireless sensors for physical quantities, like temperature and pressure, as well as gas sensors or identification-tags (ID-tags). The sensors are robust, work passively without a battery, can be applied at high temperatures, and provide a high resolution. Nevertheless, if the devices are used wirelessly in an industrial environment, several constraints have to be taken into account, especially when more than one quantity or device needs to be measured at the same time. The paper addresses the challenges that must be tackled when establishing multi-sensor-wireless-readout for industrial applications. Major issues here are the legal regulations for industrial, scientific and medical frequency bands (ISM-bands), as well as sampling time and costs, which impose severe restrictions to any system design. We describe several design approaches and their constraints. We successfully designed sensors based on reflective delay lines that allow the parallel readout of four independent temperature sensors in the 2.45 GHz ISM-band. These devices were fabricated and positively tested, demonstrating the applicability of SAW sensors for industrial applications.

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