Articles
<![CDATA[Band-pass Filter with Harmonics Suppression Capability ]]>
<![CDATA[Izni Husna Idris]]>;
<![CDATA[Mohamad Rijal Hamid]]>;
<![CDATA[Kamilia Kamardin]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Farid Zubir]]>;
<![CDATA[Huda 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.pp2512-2520
<![CDATA[This paper presents a Band-pass Filter (BPF) with a very wide suppressions band. The filter design is based on a modified U-shaped slot. Two pair of U-shaped slots is used to ensure that the filter can suppress the unwanted frequencies up to 4th harmonics. In order to achieve sharp skirt, two transmission zeroes are created near the passband area. Additional transmission zeroes are introduced to deepen the stopband area. Therefore, the passband range starts from 1.3 to 3.3 GHz and the stopband range from 3.3 GHz up to 9 GHz are achieved. The filter performances are verified through simulated and measured results.]]>
<![CDATA[A compact triband microstrip antenna utilizing hexagonal CSRR for wireless communication systems ]]>
<![CDATA[Murtala Aminu- Baba]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Farid Zubir]]>;
<![CDATA[Mohd Fairus Mohd Yusoff]]>;
<![CDATA[Adamu Y Iliyasu]]>;
<![CDATA[Mohammed Mustapha Gajibo]]>;
<![CDATA[Huda A. Majid]]>;
<![CDATA[K. I Jahun]]>
<![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.v9i5.2191
<![CDATA[In this paper, a compact triband printed antenna with hexagonal complementary split-ring resonators (CSRRs) for 4G applications is proposed. The proposed multiband antenna is comprised of a rectangular patch antenna on the top plane, while on the ground plane, hexagonal CSRRs are etched for size miniaturization (at the lower bands) and multiband generation. Another effect of the CSRR is the shifting of the initial resonance of the patch antenna from 5.17 GHz to the higher band of 6.18 GHz. The triband of 180 MHz 2.4~2.59, 150 MHz 2.79~2.94 and 420 MHz 6.04~6.46 GHz bands acquired can cover WLAN/Wi-Fi and WiMAX operating bands adequately. This can be achieved by choosing the optimal size and position of the CSRR on the ground plane carefully. The design occupies a total size of 45 x 45 mm2 using the low-cost FR-4 substrate. Good agreements are obtained between the measured results and the simulated, which are discussed and presented.]]>
<![CDATA[High gain antenna at 915 MHz for off grid wireless networks ]]>
<![CDATA[Hussam Hamid Keriee]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Nawres Abbas Nayyef]]>;
<![CDATA[Zahriladha Zakaria]]>;
<![CDATA[Ahmed Jamal Abdullah Al- Gburi]]>;
<![CDATA[Fahad Taha Al-Dhief]]>;
<![CDATA[Mustafa M. Jawad]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 9, No 6: December 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v9i6.2192
<![CDATA[This paper presents a high gain antenna for off-grid wireless networks at 915 MHz. The requirements for compact size and high gain antenna are needed in the industrial, scientific and medical (ISM) band for better performance and coverage. Hence, microstrip planar substrate is proposed to overcome the size challenges. The proposed antenna is designed based on rectangular patch with air gap technique. The proposed antenna is optimized using computer simulation technology software (CST) and fabricated on low profile FR-4 substrate. The measured performance agreed well with the simulated one. The reflection of less than -10 dB is obtained with high gain of 6.928 dB at desired frequency. Overall, this antenna can be a good candidate for the off-grid wireless network applications. ]]>
<![CDATA[Substrate integrate waveguide and microstrip antennas at 28 GHz ]]>
<![CDATA[Yaqdhan Mahmood Hussein]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Noor Asniza Murad]]>;
<![CDATA[Mustafa Mohammed Jawad]]>;
<![CDATA[Hatem O. Hanoosh]]>;
<![CDATA[Huda A. Majid]]>;
<![CDATA[Hussam H. A. Keriee]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 9, No 6: December 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v9i6.2190
<![CDATA[In this paper, two antennas are designed using substrate integrated waveguide (SIW) and microstrip technology at 28 GHz. Parametric study for both antennas is presented to demonstrate the performance at millimeter wave frequency for wireless communication network (5G application). Roger RT5880 substrates with permittivity 2.2 and loss tangent 0.0009 are used to implement the antennas with two thicknesses of 0.508 mm and 0.127 mm respectively. Both antennas have the same size of substrate 12x12 mm with a full ground plane was used. Structures designs have been done by using computer simulation technology (CST). The simulation results showed that the antenna with SIW and roger RT 5880 substrate thickness 0.508 has better performance in term of return loss and radiation pattern than the microstrip patch antenna at 28 GHz. A return loss more than -10 dB and the gain are 6.4 dB obtained with wide bandwidth range of (27.4-28.7) GHz. This proving to increase the realized gain by implementing SIW at millimeter wave band for 5G application network. ]]>
<![CDATA[Video Monitoring Application using Wireless Sensor Node with Various External Antenna ]]>
<![CDATA[Amerrul Zabri]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Farid Zubir]]>;
<![CDATA[Norsaidah Muhamad Nadzir]]>;
<![CDATA[Huda A. Majid]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 6, No 1: April 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v6.i1.pp148-154
<![CDATA[Surveillance and monitoring has become very important for security reasons these days. The use of wireless sensor node device offers a variety of platform depends on the attached sensor. When an image sensor is attached, the wireless sensor node is capable of monitoring an area wirelessly. Since wireless environment uses antenna to transmit and receive data, antenna is an important component that affects the video monitoring performance. This paper describes a surveillance system using Raspberry Pi with various external antenna. The Raspberry Pi with Pi Camera module and various types of antennas was used for testing and experimentation in line-of-sight (LOS) and non-line-of-sight (NLOS) condition. The results revealed that the Yagi Uda antenna gives the best output in terms of its signal strength and average Receive (Rx) rate.]]>
<![CDATA[Comparative analysis of sokal’s equations versus load-pull implementation of class E low-pass network ]]>
<![CDATA[Boodhoo Kirish]]>;
<![CDATA[Farid Zubir]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Shaharil Mohd Shah]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 3: September 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v19.i3.pp1348-1357
<![CDATA[In this paper, class E power amplifiers (PA) aimed at frequency bandwidth of 3.4 GHz to 3.6 GHz (LTE 42) and 3.6 GHz to 3.8 GHz (LTE 43) respectively are designed with objective of attaining high efficiency. The viability of Sokal’s equations for present communication systems aimed at GHz are analyzed for high efficiency using HEMT (high-electron-mobility transistor) on Nitronex NPTB00004 as opposed to the Bipolar Junction Transistor used by Sokal in 1975. Load-pull configuration techniques aimed at the drain is implemented at the output matching network (OMN) and benchmarked against Sokal’s equation. At the OMN, to suppress harmonics, band-pass filters are employed for the LTE 42 and 43 respectively. Sokal’s equation shows that the drain must be conjugately matched before his equations are applied at the OMN. The efficiency at 3.4 GHz obtained for Sokal’s circuit is at 67 % and gain of 9.3 dB. More than 65% efficiency is obtained from load-pull network at 3.4 GHz to 3.76 GHz before filter implementation while showing gain above 7.8 dB. After filter addition at OMN, the efficiency is above 65% and gain above 8 dB for dual - band having bandwidth of 3.4389 GHz - 3.542GHz and 3.6569GHz - 3.8GHz.]]>
<![CDATA[Multiple element of miniaturized printed log-periodic second series koch dipole array antenna for wideband chipless RFID tag reader ]]>
<![CDATA[Mohd Ezwan Bin Jalil]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Noor Asmawati Samsuri]]>;
<![CDATA[Sunti Tuntrakool]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 2: November 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v20.i2.pp887-893
<![CDATA[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.]]>
<![CDATA[A multiband and wideband frequency reconfigurable slotted bowtie antenna ]]>
<![CDATA[Izni Husna Idris]]>;
<![CDATA[Mohamad Rijal Hamid]]>;
<![CDATA[Kamilia Kamardin]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Huda A. Majid]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 3: September 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v19.i3.pp1399-1406
<![CDATA[A multiband and wideband frequency reconfigurable antenna is presented. A wideband from 3.5 GHz to 9.0 GHz is achieved by introducing one stripline in the middle of a slotted bowtie antenna, whereas multiband is obtained by integrating an additional two slotted arms at the end of bowtie-shaped. As a result, the antenna operated at multiband mode (1.7 GHz and 2.6 GHz) and wideband mode (3.5 GHz to 9.0 GHz) simultaneously. The reconfigurability of the antenna is attained through switches. Five states are achieved with three pairs of switches configurations. All results are presented and discussed, including S11, current distribution, radiation pattern, and gain. The antenna is suitable to be used in multimode communication systems.]]>
<![CDATA[Indoor Channel Capacity Measurement of 2 x 2 MIMO Polarization Diversity Antenna ]]>
<![CDATA[Mohamed Nasrun Osman]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Mohamad Rijal Hamid]]>;
<![CDATA[Mohd Fairus Mohd Yusoff]]>;
<![CDATA[Mohamad Zoinol Abidin A. Aziz]]>;
<![CDATA[Muzammil Jusoh]]>;
<![CDATA[Muhammad Azfar Abdullah]]>;
<![CDATA[Nursaidah Muhamad Nadzir]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 3: June 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v10.i3.pp1196-1202
<![CDATA[This paper presents the channel capacity investigation and the polarization reconfigurable antenna analysis for MIMO system in an indoor scenario. A single and dual-port polarization reconfigurable antenna is used at the receiver end to study the effect of polarization diversity configurations towards the achievable performance of the channel capacity. The polarization reconfigurable antennas are developed through two techniques, which are slits perturbation for single-port and feeding network modification for dual-port. The benefits offered by the designed antennas are investigated when being used as a receiver in both line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios. The results show the proposed antennas are suitable to be adopted and highly potential to improve the channel capacity of the MIMO systems.]]>
<![CDATA[Size miniaturization of chipless RFID tag using metamaterial structure ]]>
<![CDATA[Mohd Ezwan B. Jalil]]>;
<![CDATA[Mohamad Kamal A. Rahim]]>;
<![CDATA[Osman B. Ayop]]>;
<![CDATA[Noor Asmawati Samsuri]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 2: August 2019 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijeecs.v15.i2.pp723-732
<![CDATA[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.]]>
