Hybrid Microstrip Device for Hydrogen Detection at Microwave Frequencies
Por:
dos Santos, KS, Cavalcanti, GO, Azevedo, A, Silva, CPD, de Melo, MT, Llamas-Garro, I, Fontana, E
Publicada:
1 abr 2023
Resumen:
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.
Filiaciones:
dos Santos, KS:
Univ Estacio, Dept Engn Eletr, BR-50720225 Recife, PE, Brazil
Cavalcanti, GO:
Univ Pernambuco, Escola Politecn, BR-50670901 Recife, PE, Brazil
Azevedo, A:
Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE, Brazil
Silva, CPD:
Univ Fed Pernambuco, Dept Eletr & Sistemas, BR-50670901 Recife, PE, Brazil
de Melo, MT:
Univ Fed Pernambuco, Dept Eletr & Sistemas, BR-50670901 Recife, PE, Brazil
Llamas-Garro, I:
Ctr Tecnol Telecomunicac Catalunya, Barcelona 08860, Spain
Fontana, E:
Univ Fed Pernambuco, Dept Eletr & Sistemas, BR-50670901 Recife, PE, Brazil
Open Access
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