Effects of environmental media on the transmission of an inductive link in wireless microsystems

doi:10.1007/s11465-017-0450-1

Front. Mech. Eng.

2017, Vol. 12

Issue (4) : 554-556 https://doi.org/10.1007/s11465-017-0450-1

SHORT COMMUNICATION

Effects of environmental media on the transmission of an inductive link in wireless microsystems

Lei DONG, Li-Feng WANG, Qing-An HUANG(

)

Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China

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Abstract

An inductive link between two magnetically coupled coils in wireless microsystems is modeled by considering an additional parasitic capacitive link to describe the effect of environmental media. With a system of inductor-capacitor passive wireless sensors, the effects of environmental media are studied theoretically and experimentally for the first time. Results suggest that the capacitive link is non-negligible when the distance between the two coupled coils is comparable with the coupling area, particularly when the environmental medium has a large dielectric constant.

Keywords capacitive link monitoring correction passive wireless sensor

Corresponding Author(s): Qing-An HUANG

Just Accepted Date: 07 June 2017 Online First Date: 19 July 2017 Issue Date: 31 October 2017

Cite this article:

Lei DONG,Li-Feng WANG,Qing-An HUANG. Effects of environmental media on the transmission of an inductive link in wireless microsystems[J]. Front. Mech. Eng., 2017, 12(4): 554-556.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-017-0450-1
https://academic.hep.com.cn/fme/EN/Y2017/V12/I4/554

Fig.1 Schematic of LC passive wireless telemetry: (a) Typical LC sensing system; (b) lumped-circuit model of LC sensor telemetry in consideration of the capacitive link

Fig.2 Measurement setup. Different chemical media are sealed in a plastic bag (~50 μm thick) to change the dielectric constant in the capacitive link

Tab.1 Relative dielectric constants of different media

Fig.3 Experimental results: (a) Resonant frequency of the LC sensor with different media; (b) comparisons of measurement results with those of the models with and without the capacitive link

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