ANALYSIS AND DESIGN OF A METAL MOUNTABLE UHF RFID TAG ANTENNA WITH CAPACITIVE SENSOR FOR METAL DEFECT DETECTION

Hartadin, Jerzan (2026) ANALYSIS AND DESIGN OF A METAL MOUNTABLE UHF RFID TAG ANTENNA WITH CAPACITIVE SENSOR FOR METAL DEFECT DETECTION. Bachelor thesis, Institut Teknologi Kalimantan.

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Abstract

Damage to metallic materials, such as cracks and corrosion, can compromise structural integrity and potentially lead to failure in various industrial infrastructures. Conventional Non-Destructive Testing (NDT) methods have limitations, including high costs, the need for skilled operators, and a lack of support for continuous monitoring. This study proposes the design of a metal mountable UHF RFID tag antenna integrated with an Interdigital Capacitor (IDC) to detect metal defects passively and wirelessly. The antenna was designed using a circular patch structure, fabricated on a Rogers RO4003C substrate, and simulated using CST Studio Suite, yielding an impedance of 15 + j326.30 Ω at a frequency of 923 MHz. The IDC sensor has a simulated capacitance of 3.77 pF and a measured capacitance of 3.8 pF, and is integrated with the SL900A RFID chip. Measurements using a Vector Network Analyzer (VNA) show an antenna impedance of 94.80 + j360.02 Ω, with a maximum read range on a metal surface of 2 cm. Testing showed that cracks caused the RSSI to decrease from −36.2 dBm to −44.8 dBm and the capacitance to decrease from 6.3 pF to 5.7 pF. Conversely, corrosion caused the RSSI to decrease to −46.1 dBm and the capacitance to increase to 8.0 pF at a thickness of 0.262 mm. The differences in RSSI and capacitance responses indicate that the system is capable of distinguishing between cracks and corrosion on metal surfaces. The total cost of implementing the system was Rp1,871,000, which is lower than that of conventional NDT equipment, demonstrating the potential of passive RFID as a cost-effective solution for Structural Health Monitoring.

Item Type:	Thesis (Bachelor)
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Jurusan Teknologi Industri dan Proses > Teknik Elektro
Depositing User:	Jerzan Jerzan Hartadin
Date Deposited:	16 Jul 2026 06:05
Last Modified:	16 Jul 2026 06:05
URI:	http://repository.itk.ac.id/id/eprint/26782

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