Hybrid Microstrip Device for Hydrogen Detection at Microwave Frequencies
This article describes the analysis, design, and construction of a microstrip device capable of detecting hydrogen at microwave frequencies. The proposed structure is a hybrid microstrip line, 10-cm-long, having part of the copper (Cu) line replaced by a strip of palladium (Pd) film 10-nm-thick. A s...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) |
| Repositorio: | r-CTTC. Repositorio Institucional Producción Científica del Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) |
| OAI Identifier: | oai:cttc.fundanetsuite.com:p7896 |
| Acceso en línea: | https://cttc.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=7896 |
| Access Level: | acceso abierto |
| Palabra clave: | Hydrogen Palladium Sensors Conductivity Microstrip Skin Attenuation Hydrogen detection microstrip palladium (Pd) sensor |
| Sumario: | This article describes the analysis, design, and construction of a microstrip device capable of detecting hydrogen at microwave frequencies. The proposed structure is a hybrid microstrip line, 10-cm-long, having part of the copper (Cu) line replaced by a strip of palladium (Pd) film 10-nm-thick. A simple formulation has been developed to estimate the device's insertion loss, as well as the spectral dependence of the S-21 parameter. For a device having a 2-cm-long Pd section, exposed to 1.6% hydrogen at a 0.4-bar pressure in nitrogen gas, detection was accomplished by measuring the changes produced on one of the resonances of the scattering parameter S-21 in the frequency region around 3.2 GHz. The experimental results, corroborated by the theoretical modeling of the device's response, indicated that, if on one hand, a Pd thickness much smaller than the skin depth, yields a negligible change in attenuation due to hydrogen absorption, on the other, it favors the phase of the S-21 parameter to become a highly sensitive function of Pd conductivity, in turn facilitating hydrogen detection. This finding opens the possibility of constructing simple hydrogen sensors by incorporating ultrathin Pd films into planar microwave circuits. |
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