Noor Asmawati Samsuri
Universiti Teknologi Malaysia

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Specific Absorption Rate Assessment of Multiple Microstrip Patch Antenna Array Nur Ilham Aliyaa Ishak; Norhudah Seman; Noor Asmawati Samsuri
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 4: August 2018
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v16i4.9041

Abstract

Interaction between electromagnetic field (EMF) radiated from multiple antennas and human body is crucial to be explored as multiple antennas are the essential implemented devices to achieve the requirements of the future evolved fifth generation (5G) technology. Thus, this article presents a significant study of the radiated EMF effect from a single, and multiple antennas towards human through the assessment of specific absorption rate (SAR). The single antenna, 1 x 2, 1 x 3 and 1 x 4 arrays of microstrip patch antennas are designed to cover mobile operating frequencies of 0.8, 0.85, 0.9, 1.8, 2.1 and 2.6 GHz. Two types of human head phantoms are implemented in this study, which are specific anthropomorphic mannequin (SAM) and Voxel head model that placed close to single antenna or antenna array to investigate the penetration of EMF towards the human tissue. The single antenna or antenna array is placed with fixed distance of 10 mm from the phantom, which excited by maximum allowable power of 19 dBm in CST Microwave Studio 2016. The effect of the radiated EMF that quantified by SAR parameter, which depicts satisfying results against the established standard limits at averaged 1g and 10g mass of tissues for all designated frequencies that utilized for single and multiple antennas.
Multiple element of miniaturized printed log-periodic second series koch dipole array antenna for wideband chipless RFID tag reader Mohd Ezwan Bin Jalil; Mohamad Kamal A. Rahim; Noor Asmawati Samsuri; Sunti Tuntrakool
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 2: November 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i2.pp887-893

Abstract

This paper aims to produce a low profile, wideband, and high gain antenna for chipless RFID tag readers. A miniaturized and wideband printed Log-periodic second series koch dipole array (LPSSKDA) with eleven elements operating over 0.8 GHz-3.2 GHz is designed using the FR4 board. The single LPSSKDA antenna, which acts as the chipless RFID reader antenna having gain between 5.2 and 6.1 dBi and frequency range from 1-3 GHz. A double element of the LPSSKDA antenna is proposed for improving the antenna gain to 6.9-7.9 dBi over the frequency range. The antenna is fabricated to validate the simulation and measurement results in terms of reflection coefficient, radiation pattern, and surface current distribution.
Size miniaturization of chipless RFID tag using metamaterial structure Mohd Ezwan B. Jalil; Mohamad Kamal A. Rahim; Osman B. Ayop; Noor Asmawati Samsuri
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 2: August 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i2.pp723-732

Abstract

A Chipless RFID based Modified Complementary Split Ring Resonator (MCSRR) with Different Width (DW) which is metamaterial structure is designed using PET substrate (  =3, loss tangent = 0.025 at 2 GHz) to miniaturize effective length size of conventional split ring resonator. The MCSRR structure with DW provides less size about 17% compared with the conventional MCSRR structure. The single MCSRR resonator with different width only requires a frequency range of 12 % of Complementary Split Ring Resonator (CSRR) resonator. The slotted MCSRR resonator is located underneath substrate and within substrate is connected with transmission lines. The insertion loss value of MCSRR resonator is used to encode ID information of chipless RFID with maximizing ID information using Frequency Position technique. The best swapping parameter for encoding ID number information is split gap of both ring compare with other parameter such as spacing between ring and width of ring.