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All Journal International Journal of Electrical and Computer Engineering TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
H. A. Majid
Universiti Tun Hussein Onn Malaysia
Computer Science & IT Electrical & Electronics Engineering

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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

 1 
Switchable Wideband Metamaterial Absorber and AMC reflector for X-band Applications and Operations M. M. Gajibo; M. K. A. Rahim; N. A. Murad; O. Ayop; H. A. Majid
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.v16i4.9065

Abstract

A single layered metamaterial structure with capabilities of switching from a wideband metamaterial absorber to an AMC reflector and vice versa is presented in this paper. A flame retardant 4 substrate with physical thickness of 1.60mm was used. The absorption rate, reflection rate, reflection phase and surface current distribution were studied and discussed. The operational incidental wave angles were varied from 0o to 65o. A peak reflection of about 90% was achieved at 11.20 GHz with a usable bandwidth (-90 to +90) of 3.01 GHz by the AMC reflector. The metamaterial absorber demonstrated a wideband performance (from 8.10 GHz to 14.30 GHz). It achieved 100% absorption at 11.20 GHz and not less than 65
Fractal Yagi-Uda antenna for WLAN applications Amerrul Zabri; M. K. A. Rahim; F. Zubir; N. M. Nadzir; H. A. Majid
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 5: October 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i5.12797

Abstract

This paper describes the development of a Fractal printed Yagi-Uda antenna for Wireless Local Area Network (WLAN) applications operating at 2.4 GHz frequency. In miniaturizing the dimensions of an antenna, fractal method is applied where the 1st iteration and 2nd iteration is implemented. The Computer Simulation Technology (CST) software is used as the platform to design and simulate the antenna. The substrate material used is the FR-4 board which has a dielectric constant of 5.4, the thickness of 1.6mm and tangent loss of 0.019. The antenna performance interm of the reflection coefficient, radiation pattern and gain are compared and analyzed. For the 1st iteration, 22.81% of reduction size has been achieved and 30.81% reduction of the antenna size for 2nd iteration has been achieved.
Mutual Coupling Reduction in Antenna Using EBG on Double Substrate Raimi Dewan; M. K.A. Rahim; M. R. Hamid; M. E. Jalil; H. A. Majid
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 2: June 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i2.6123

Abstract

In this paper, a mutual coupling studies is conducted between two-element array antenna on dual substrate. A single patch antenna is firstly designed on dual substrate layer to testify appropriate performance at 2.45 GHz. Subsequently, an array of two element patches on dual substrate are constructed with one of them is incorporated with three EBG unit cell on the bottom substrate. The radiating patch is on the top substrate, while the EBG unit cells is on the bottom substrate. With EBGs in separate layers from the antenna array, the antenna elements are closely separated by a distance of 22 mm with a significant reduced mutual coupling of -26.61 dB. This correspond to a distance reduction of 34.68%. The proposed structure implemented only three EBG unit cells. Apart from that, the study of overlapped case of EBG with the antenna is also presented.
Meander bowtie Antenna for Wearable Application N. Othman; N. A. Samsuri; M. K. A. Rahim; K. Kamardin; H. A. Majid
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.v16i4.9061

Abstract

This paper proposes a flexible compact bowtie antenna for medical application that operates at 2.45 GHz. The proposed antennas are miniaturized using meander technique. Both substrates and conducting material of the antenna are made of flexible material semi-transparent film as the substrate and shieldit fabric as the conducting material which suitable for wearable and on body application. The results show that the total length of the antenna is significantly reduced by up to 38%. However, the gain of the antenna is slightly decreased when the size of the antenna become smaller. The results of this research could provide guidance and has significant implication for future development of wearable electronics especially in medical monitoring application.
Co-Authors A. A. Rosman A. Ashyap A. Ponniran A. S. Ab Ghafar A. Y. Ashyap Amerrul Zabri B. A. F. Esmail B. D. Bala C. Macwright F. A. Saparudin F. C. Seman F. Hassan F. Zubir F. Zubir K. Kamardin M. A. Abdullah M. A. Z. A. Rashid M. E. Jalil M. F. Ismail M. F. M. Yusoff M. Jusoh M. K. A. Rahim M. K.A. Rahim M. M. Gajibo M. M. Zahar M. Mohamad M. N. A. H. Shaabani M. R. Hamid M. S. Mohd N. A. Murad N. A. Samsuri N. Katiran N. M. Nadzir N. Othman N. S. M. Yaziz N. S. Nadzir Najib Al-Fadhali Norsaidah Muhamad Nadzir O. Ayop R. Dewan Raimi Dewan S. A. Hamzah S. H. Dahlan S. M. Shah S. Mohamad Shaharil Mohd Shah T. C. Chee Z. Z. Abidin