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Low-Cost and Lightweight 3D-Printed Split-Ring Resonator for Chemical Sensing Applications
Ahmed Salim1, Saptarshi Ghosh2, Sungjoon Lim3
1School of Electrical and Electronics Engineering, College of Engineering, Chung-Ang University, 221, Heukseok-Dong, Dongjak-Gu, Seoul 156-756, Korea. ahmedsalim789@gmail.com.
Sensors (Basel, Switzerland)
|September 15, 2018
Summary
This study introduces a lightweight, 3D-printed microwave cavity resonator for chemical sensing. The novel design, using polylactic acid, demonstrates a significant frequency shift when detecting deionized water, highlighting its potential for cost-effective sensing applications.
Area of Science:
- Microwave Engineering
- Chemical Sensing
- Materials Science
Background:
- Microwave cavity resonators are crucial for sensing applications.
- Traditional metallic resonators can be heavy and expensive.
- 3D-printing offers potential for novel resonator designs.
Purpose of the Study:
- To present a novel, lightweight, and inexpensive microwave cavity resonator for chemical sensing.
- To utilize 3D-printing technology with polylactic acid (PLA) for resonator fabrication.
- To demonstrate the sensor's capability in detecting deionized water (DIW).
Main Methods:
- Fabrication of a 3D split-ring resonator (SRR) and external cavity using 3D-printing with PLA.
- Silver-coating of the SRR and cavity surfaces.
- Integration of a Teflon tube through the SRR split-gap for sample introduction.
- Measurement of resonance frequency, insertion loss, and quality factor (Q) with and without DIW.
Main Results:
- The 3D-printed resonator achieved a resonance frequency of 2.56 GHz with an insertion loss of 13.6 dB and Q of 75.
- A significant frequency shift of 205 MHz was observed upon injecting DIW into the Teflon tube.
- The estimated weight of the resonator is 22.8 g, significantly lighter than comparable metallic structures.
Conclusions:
- The proposed 3D-printed microwave cavity resonator offers a lightweight and cost-effective solution for chemical sensing.
- The observed frequency shift demonstrates the sensor's sensitivity to changes in the dielectric properties of the sample.
- This technology holds promise for developing portable and affordable sensing devices.
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