研究目的
To propose a branching inductor for implementing multiple resonances in a single inductor to enable simultaneous monitoring of multiple parameters (e.g., humidity and pressure) using LC sensors, addressing the challenge of mutual coupling in multi-parameter detection.
研究成果
The branching inductor enables multi-parameter detection with passive wireless LC sensors. Experimental validation shows successful simultaneous monitoring of humidity and pressure with specified sensitivities. Decoupling is essential to mitigate mutual coupling effects. The structure is scalable for more parameters but requires careful design to avoid frequency overlap and manage increased coupling complexity.
研究不足
The mutual coupling between branches complicates frequency shifts, requiring decoupling for accurate measurement. The coupling coefficient calculation is simplified and may have errors; theoretical formulas for mutual inductance and capacitance are not fully developed. The readout range is limited (signal loss beyond 6 mm distance), and the method is primarily validated for two parameters; extension to more branches increases complexity.
1：Experimental Design and Method Selection:
The study designs a branching inductor structure to create multiple resonant circuits for multi-parameter sensing. It employs theoretical models for coupling analysis (inductive and capacitive coupling) and uses equivalent circuits to derive resonant frequencies.
2：Sample Selection and Data Sources:
A double branching inductor is fabricated on a PET substrate. Sensitive capacitors for humidity (interdigital capacitor with graphene oxide) and pressure (parallel-plate capacitor with PDMS dielectric) are used.
3：List of Experimental Equipment and Materials:
Materials include PET substrate (PET DDEB2120PMI), graphene oxide (GO), PDMS, silicon wafer for molding, silver paste, BOPP tape. Equipment includes network analyzer (Agilent N5224A PNA), humidity chamber (OMEGA 205), vacuum meter (Tenmars VC 9200), pump for pressure control, and manual winding coil for readout.
4：Experimental Procedures and Operational Workflow:
Fabrication involves anisotropic etching of silicon wafer for PDMS molding, electrodeposition on PET, assembly of capacitors and inductor, packaging, and GO application. Measurement involves wireless interrogation with the network analyzer, controlling humidity and pressure in a sealed chamber, and recording resonant frequencies.
5：Data Analysis Methods:
Data is analyzed using derived equations for resonant frequencies and coupling coefficients, with decoupling performed using software (Wolfram Mathematica) to obtain original frequencies from resultant frequencies.
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