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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 Bulletin of Electrical Engineering and Informatics Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Mohd Haizal Jamaluddin
Universiti Teknologi Malaysia
Computer Science & IT Electrical & Electronics Engineering Engineering

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Higher-order Mode Rectangular Dielectric Resonator Antenna for 5G Applications Nor Hidayu Shahadan; Muhammad Ramlee Kamarudin; Mohd Haizal Jamaluddin; Yoshihide Yamada
Indonesian Journal of Electrical Engineering and Computer Science Vol 5, No 3: March 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v5.i3.pp584-592

Abstract

The excitation of the higher-order mode, in rectangular dielectric resonator designed was explored to enhance the antenna gain and detailed elaboration is presented in this paper. The antenna was fed by a 50Ω microstrip line through an aperture cut in the ground plane. Besides avoiding spurious radiation, this feeding technique gives flexibility in controlling the amount of coupling in order to reduce the Q-factor in the higher-order mode RDRA. A design was developed and subsequently simulated using Ansoft HFSS ver 16.0 by utilizing Duroid 5880 dielectric substrate with a thickness (ts) of 0.254 mm, a permittivity (εs) of 2.2 and a loss tangent (δ) of 0.001 at 15 GHz. The higher-order mode, RDRA achieved the measured gain at 9.76 dBi and the measured impedance bandwidth as much 2.5 GHz which is 4.7% more compared to the fundamental mode. The result should be considered suitable for 5G applications.
A 5G graphene antenna produced by screen printing method Siti Nor Hafizah Sa’don; Mohd Haizal Jamaluddin; Muhammad Ramlee Kamarudin; Fauzan Ahmad; Samsul Haimi Dahlan
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.pp950-955

Abstract

The save and fast manufacturing are required in order to achieve 5G technology. However, there are many kinds of manufacturing antenna which are depending on material applied in the antenna itself. Each type of manufacturing also has its own advantages and drawback. In this article, a graphene antenna for 5G applications is manufactured using screen printing method. A fine mesh resolution of 120 µm is used to print the antenna accurately. This kind of printing has capability to produce antenna in less than 5 minutes. The antenna made by conductive graphene ink has size of 11.8 x 12.2 x 0.076 mm3 and produced within a small amount of graphene ink. The measured antenna resonates at 15.04 GHz with reflection coefficient magnitude of -12.05 dB and percentage of impedance bandwidth is 30 % which is in the range of 13.3 to 18.0 GHz. The radiation pattern at E-plane and H-plane of the graphene antenna are simulated and measured where the result obtained are comparable.
Co-Authors Abinash Gaya Abinash Gaya Fauzan Ahmad Irfan Ali Irfan Ali M. H. Dahri M. R. Kamarudin Muhammad Hashim Dahri Muhammad Ramlee Kamarudin Muhammad Ramlee Kamarudin Muhammad Ramlee Kamarudin Nor Hidayu Shahadan Nur Fazreen Sallehuddin Nuramirah Mohd Nor R. Selvaraju Samsul Haimi Dahlan Siti Nor Hafizah Sa’don Siti Umairah Tajol Anuar Siti Zareen Naqiyah Zool Ambia Yoshihide Yamada