Articles
<![CDATA[Dual Band to Wideband Pentagon-shaped Patch Antenna with Frequency Reconfigurability using EBGs ]]>
<![CDATA[Raimi Dewan]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[M. R. Hamid]]>;
<![CDATA[M. F. M. Yusoff]]>;
<![CDATA[H. A. Majid]]>;
<![CDATA[B. A. F. Esmail]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 4: August 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v8i4.pp2557-2563
<![CDATA[A dual band to wideband reconfigurable pentagon-shaped antenna with EBG unit cell is proposed. A minimal number of two EBG unit cell is deployed to realize frequency reconfigurable mechanism. By varying the state of the EBG the antenna is capable to change its dual band operation to wideband alternately. There are three cases that have been analysed, first case is the EBG incorporated antenna with ideal and second is with the active EBG. Subsequently, the third cases is the fabricated ideal EBG incorporated antenna. The dual band operation is at 1.8 GHz and 5.2 GHz while the wide band from 1.6 GHz to 2.37 GHz (770 MHz). The proposed reconfigurable antenna is suitable to be implemented for LTE (1.6 GHz), Wi-Fi (5.2 GHz), WiMAX (2.3 GHz) and cognitive radio application.]]>
<![CDATA[Diagnosis of Faulty Elements in Array Antenna using Nature Inspired Cuckoo Search Algorithm ]]>
<![CDATA[Shafqat Ullah Khan]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[Murtala Aminu-Baba]]>;
<![CDATA[Atif Ellahi Khan Khalil]]>;
<![CDATA[Sardar Ali]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 3: June 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v8i3.pp1870-1874
<![CDATA[Detection and correction of faulty elements in a linear array have great importance in radar, sonar, mobile communications and satellite. Due to single element failure, the whole radiation pattern damage in terms of side lobes level and nulls. Once we have detect the position of defective element, then correction method is applied to achieve the desired pattern. In this work, we introduce a nature inspired meta-heuristic cuckoo search algorithm to diagnose the position of defective elements in a linear array. The nature inspired cuckoo search algorithm is new to the optimization family and is used first time for fault detection in an array antenna. Cuckoo search algorithm is a global search optimization technique. The cost function is used as a fitness function which defines an error between the degraded far field power pattern and the estimated one. The proposed technique is used effectively for the diagnosis of complete, as well as, for partial faulty elements position. Different simulation results are evaluated for 40 elements Taylor pattern to validate and check the performance of the proposed technique.]]>
<![CDATA[Diagnosis of Faulty Sensors in Antenna Array using Hybrid Differential Evolution based Compressed Sensing Technique ]]>
<![CDATA[Shafqat Ullah Khan]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[I. M. Qureshi]]>;
<![CDATA[N. A. Murad]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 7, No 2: April 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v7i2.pp961-966
<![CDATA[In this work, differential evolution based compressive sensing technique for detection of faulty sensors in linear arrays has been presented. This algorithm starts from taking the linear measurements of the power pattern generated by the array under test. The difference between the collected compressive measurements and measured healthy array field pattern is minimized using a hybrid differential evolution (DE). In the proposed method, the slow convergence of DE based compressed sensing technique is accelerated with the help of parallel coordinate decent algorithm (PCD). The combination of DE with PCD makes the minimization faster and precise. Simulation results validate the performance to detect faulty sensors from a small number of measurements.]]>
<![CDATA[The Improvement of first Iteration Log Periodic Fractal Koch Antenna with Slot Implementation ]]>
<![CDATA[N. S. M. Yaziz]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[F. Zubir]]>;
<![CDATA[N. S. Nadzir]]>;
<![CDATA[R. Dewan]]>;
<![CDATA[H. A. Majid]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 4: August 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v8i4.pp2564-2570
<![CDATA[In this paper, a slotted is introduced at each of the radiating elements on the 1st iteration log periodic fractal Koch antenna (LPFKA). The antenna is designed to testify the appropriate performance at UHF Digital television which operates from 4.0 GHz to 1.0 GHz. The dimension of the conventional 0th iteration LPKFA is successfully reduced by 17% with the implementation of slotted. The results show a good agreement with a stable radiation pattern across the operating bandwidth, stable gain more than 5 dBi and reflection coefficient of below -10 dB over the desired frequency range.]]>
<![CDATA[Dual element MIMO planar inverted-F antenna for 5G millimeter wave application ]]>
<![CDATA[H. M. R. Nurul]]>;
<![CDATA[Z. Mansor]]>;
<![CDATA[M. K. A. Rahim]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 4: August 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i4.12762
<![CDATA[This work presents a 28 GHz Dual Element Multiple Input Multiple Output (MIMO) Planar Inverted-F Antenna for millimeter wave 5G mobile terminal. The antenna design employs PIFA design concept as it is a common antenna type use for mobile phone as it provides wide bandwidth and good performance. The antenna design begins with a characterization of the single element PIFA design and then extended to Dual Element MIMO PIFA design. The single element PIFA design is enhanced to MIMO design by extending the ground plane and locate the second PIFA at the other end. Isolation between the antenna elements of the MIMO PIFA is analyzed by varying the gap distance between the antenna elements. The result for Envelope Correlation Coefficient, Diversity Gain and Multiplexing Efficiency is also presented. The simulation computed using Computer Simulation Technology (CST) Microwave Studio software.]]>
<![CDATA[Switchable Wideband Metamaterial Absorber and AMC reflector for X-band Applications and Operations ]]>
<![CDATA[M. M. Gajibo]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[N. A. Murad]]>;
<![CDATA[O. Ayop]]>;
<![CDATA[H. A. Majid]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 4: August 2018 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v16i4.9065
<![CDATA[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]]>
<![CDATA[Wide to multiband elliptical monopole reconfigurable antenna for multimode systems applications ]]>
<![CDATA[I. H. Idris]]>;
<![CDATA[M. R. Hamid]]>;
<![CDATA[K. Kamardin]]>;
<![CDATA[M. K. A. Rahim]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 4: August 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i4.12764
<![CDATA[Wideband-multiband reconfigurable elliptical monopole antenna is investigated in this paper. By having conventional elliptical monopole antenna, wideband operating frequency is obtained. With the combination of dual pairs of slotted arms and a band-pass filter on the ground plane of the elliptical monopole, multiband is achieved. Dual-band operating frequencies at 1.6 GHz and 2.6 GHz while wideband operates from 3.35 GHz to 9 GHz. Therefore, wide range of wireless communication systems is obtained from the proposed antenna to support the multiband mode (i.e. GPS and LTE) and UWB systems. Frequency reconfigurable is achieved by controlling the switches integrated on the antenna structure. Simulated results of reflection coefficient, radiation patterns and gain performance are presented. The proposed antenna design is suitable candidate for different wireless communication applications.]]>
<![CDATA[Fractal Yagi-Uda antenna for WLAN applications ]]>
<![CDATA[Amerrul Zabri]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[F. Zubir]]>;
<![CDATA[N. M. Nadzir]]>;
<![CDATA[H. A. Majid]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 5: October 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i5.12797
<![CDATA[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.]]>
<![CDATA[Meander bowtie Antenna for Wearable Application ]]>
<![CDATA[N. Othman]]>;
<![CDATA[N. A. Samsuri]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[K. Kamardin]]>;
<![CDATA[H. A. Majid]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 4: August 2018 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v16i4.9061
<![CDATA[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.]]>
<![CDATA[Wideband millimeter-wave substrate integrated waveguide cavity-backed antenna for satellites communications ]]>
<![CDATA[Najib AL-Fadhali]]>;
<![CDATA[Huda A. Majid]]>;
<![CDATA[Rosli Omar]]>;
<![CDATA[M. F. Ismail]]>;
<![CDATA[M. K. A. Rahim]]>;
<![CDATA[Abdul Rashid O. Mumin]]>;
<![CDATA[B. A. F. Esmail]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 9, No 5: October 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v9i5.2238
<![CDATA[This paper presents a new type of wideband waveguide (SIW) cavity-backed patch antenna for millimeter wave (mmW). The antenna proposed applies to applications of 31-36 GHz Ka-band such as satellites communications. The SIW is intended with settings for particular slots. The antenna is constructed on Rogers RT5880 (lossy) with 2.2 dielectric constant, l.27 mm thickness, and 0.0009 loss tangent. It is simulated in the programming of computer simulation technology (CST) Microwave Studio. The simulated results show that the SIW antenna resonates across 31 to 36 GHz bands, which means that this new antenna covers all applications within this range. The reflection coefficients in targeting range are below 10 dB. The antenna achieves good efficiency and gain with 80% and 8.87 dBi respectively.]]>
