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All Journal International Journal of Electrical and Computer Engineering TELKOMNIKA (Telecommunication Computing Electronics and Control) Proceeding of the Electrical Engineering Computer Science and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Razali Ngah
Universiti Teknologi Malaysia
Computer Science & IT Electrical & Electronics Engineering

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Journal : International Journal of Electrical and Computer Engineering

 1 
Impedance Mathing Improvement of Half-Cut Broadband Printed Monopole Antenna with Microstrip Feeding Teguh Prakoso; Mochammad Facta; Razali Ngah; Tharek A. Rahman
International Journal of Electrical and Computer Engineering (IJECE) Vol 3, No 5: October 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (313.557 KB)

Abstract

The requirement of wireless access networks and user equipments to support coexistence of many communication standards and frequency bands poses challenge on antenna to be broadband and small. The application of half-cut technique to broadband printed monopole with microstrip feeding worsens the resulted antenna’s impedance. To improve the half-cut antenna impedance mathing, two methods were investigated in this paper: (1) monopole and ground extension, (2) the application of microstrip line transformer and ground extension. The first approach only produces limited improvement, whereas method #2 can enhance the return loss significantly. The application of the second approach potentially produces antenna pair that has low mutual coupling, good return loss, and small size. Considering its radiation pattern, the antenna is suitable for diversity and MIMO. Its application in broadband microwave-photonic access point need special arrangement due to radiation null at 5 GHz band at right side.DOI:http://dx.doi.org/10.11591/ijece.v3i5.3376
High gain 5G MIMO antenna for mobile base station Yusnita Rahayu; Indah Permata Sari; Dara Incam Ramadhan; Razali Ngah
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 1: February 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1901.203 KB) | DOI: 10.11591/ijece.v9i1.pp468-476

Abstract

This article presented a millimeter wave antenna which operated at 38 GHz for 5G mobile base station. The MIMO (Multiple Input Multiple Output) antenna consisted of 1x10 linear array configurations. The proposed antenna’s size was 88 x 98 mm^2  and printed on 1.575 mm-thick Rogers Duroid 5880 subsrate with dielectric constant of ε_r= 2.2 and loss tangent (tanδ) of 0.0009. The antenna array covered along the azimuth plane to provide the coverage to the users in omnidirection. The simulated results showed that the single element antenna had the reflection coefficient (S11) of -59 dB, less than -10 dB in the frequency range of 35.5 - 39.6 GHz. More than 4.1 GHz of impedance bandwidth was obtained. The gain of the antenna linear array was 17.8 dBi while the suppression of the side lobes was -2.7 dB.  It showed a high array gain throughout the impedance bandwidth with overall of VSWR were below 1.0646. It designed using CST microwave studio.
Co-Authors Ahmad Ismat Abdul Rahim Azmi Ibrahim Dara Incam Ramadhan E. H. Hadyan Hashim Hashim Haziq Hazman Hizamel M. Hizan Indah Permata Sari Kamilia Kamardin M. A. Riyadi Marwan Hadri Azmi Mochammad Facta Mohd Zulfadli M. Yusoff N Shazwani M. Noor Reza Firsandaya Malik Siti Harliza Mohd Razali Siti Zaiton Mohd Sock Theng Ooi Teguh Prakoso Tharek A. Rahman Tharek Abdul Rahman Yoshihide Yamada Yusnita Rahayu Zulkifli Ambak