Apertured EBG-Based Microwave Patch Antenna for Characterization of Corrosion in Steel Rebar of Civil Structures
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This paper presents the design and fabrication of a prototype microwave patch antenna system for non-destructive corrosion monitoring of embedded steel rebar in civil structures. A planar rectangular patch for 2.4 GHz resonant frequency is modeled and loaded with electromagnetic bandgap (EBG) structure having an aperture slot of 2 × 10 cm2 in the center. The EBG plane provides confined radiation from its aperture and suppresses any destructive interference in the sensing area. The proposed patch sensor is fabrication using RO4450B substrate and tested on autoclaved aerated concrete and concrete block. The EBG superstrated patch is mounted on the test specimen and magnitude of reflection coefficient (S11) is measured at the near-field distance. A change in the intensity of scattered fields because of the oxide layer formed over the rebar by corrosion process is observed and measured. Analysis of weight loss of rebar due to corrosion is correlated with scattering parameter and equivalent DC voltage signaling. The measured results show that the proposed sensing technique is useful in corrosion detection of rebar inside the civil structures.
KeywordsCorrosion monitoring Microwave patch Reflection coefficient Signal detection circuit
This Publication is an outcome of the R&D work undertaken in the Project under the Visvesvaraya Ph.D. Scheme of Ministry of Electronics & Information Technology, Government of India, being implemented by Digital India Corporation (formerly Media Lab Asia). The authors also thank Electronics Engineering Department, SVNIT, for providing the fabrication and testing facility.
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