Citation

Abasir, Radhiatul Mardhiah and Zainuddin, Norsiha and Yamada, Yoshihide and Md Jizat, Noorlindawaty and Muhsin, M. (2025) Electrical Performance of a Helical Antenna in Proximity to a Metal Plate for RFID Applications. In: 2025 22nd International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 20-23 May 2025, Bangkok, Thailand.

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Abstract

RFID tag antenna is widely used in manufacturing industries, logistic, aerospace and automotive, where metal surfaces are prevalent. A dipole tag antenna is a common type used in RFID systems due to compact size for practical application; however, the transmission has deficiency when it is placed near metal. This is due to significant interference, polarization distortion, ohmic loss due to changes in antenna's impedance at resonant frequency and reduced electric current source. As one of the preferences, helical antennas are proposed to be used in proximity to metal and are tailored to ensure the RFID tag antenna performances. Whereas a dipole antenna has only an electric current source, a helical antenna simultaneously has a magnetic and electric current source. A helical antenna can therefore function appropriately when it is positioned in proximity to a metal plate because helical antenna uses magnetic field as a radiation source rather than an electric field. The helical antenna is less sensitive to the metal effect since, they are designed to couple with the magnetic properties of the metal rather than the electric properties. Dipole antennas, however, reduce their electric current source when placed in proximity to the metal plate. In this paper, the self-resonant equation of helical antenna is determined by using capacitive and inductive reactance equations. The design of a self-resonant helical antenna is achieved at 921 MHz using the electromagnetic (EM) FEKO simulator. From the design, an analysis of electrical performance of the helical antenna due to the metal plate is performed in terms of the antenna input impedances, self resonance condition and radiation characteristics. To illustrate the difference between the dipole and helical antennas performance, the designs are simulated accordingly. An important aspect of the study is the fundamental concept of helical antennas, which ensure the electrical performance when the antenna is placed in proximity to the metal for RFID applications. Keywords—helical antenna, metal plate, self-resonance, impedance matching, electrical performance, RFID

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Helical antenna, metal plate, self-resonance, impedance matching, electrical performance, RFID
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics > TK7871 Electronics--Materials
Divisions:	Faculty of Artificial Intelligence & Engineering (FAIE)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	30 Sep 2025 03:23
Last Modified:	04 Oct 2025 08:38
URII:	http://shdl.mmu.edu.my/id/eprint/14554

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