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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

Zahriladha Zakaria

Universiti Teknikal Malaysia Melaka (UTeM)

Author-ID : 2377115

Computer Science & IT Electrical & Electronics Engineering Engineering

Published : 31 Documents Claim Missing Document

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Articles

Title

Miniaturized UWB elliptical patch antenna for skin cancer diagnosis imaging Sameer Alani; Zahriladha Zakaria; A. Ahmad
International Journal of Electrical and Computer Engineering (IJECE) Vol 10, No 2: April 2020
Publisher : Institute of Advanced Engineering and Science

The biomedical imaging shows promising results in many applications such as protein characterization and cancer detection using non-ionizing radiation. Skin cancer is one of the most common types of cancer because it is exposed by sun rays during the day. Many techniques have been offered to detect the tumor in the early stage such as ultrasonic and MW imaging. However, most of these studies showed a large printing area with lower BW so as the low resolution. To overcome these drawbacks, a new low profile UWB elliptical patch antenna with high performance is designed on PTFE as a substrate. Then a layer of Indium Tin Oxide (ITO) applies to improve the antenna radiation characteristics. The proposed antenna has a broad BW from 3.9 GHz to 30 GHz along with a resonance at 2.4 GHz. Furthermore, the antenna presents a maximum gain of 7.3 dB, maximum directivity of 7.78 dBi, the maximum radiation efficiency of 92 %, and consistent, stable radiation pattern throughout the frequency band. Besides, the time-domain characteristics show that the antenna can be a suitable candidate for microwave imaging of skin cancer.

A new energy consumption technique for mobile ad hoc networks S. Alani; Zahriladha Zakaria; Herwansyah Lago
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 5: October 2019
Publisher : Institute of Advanced Engineering and Science

A dynamic temporary network is created through wireless mobile nodes without the need for considerable infrastructure as well as a central manager. In a mobile ad hoc network, routing protocols allow a mobile for transmission and receiving packets. In the last decade, many variants have come up for the AODV. A minimum number of hop counts are chosen for enhancing routing protocols to include additional factors that can have an impact on path selections. As the distance between each node grows, the transmission power also rises accordingly. Hence, this impacts the network’s entire performance and the most important feature is the quality of service. Most of the traditional routing protocols include energy consumption levels of the nodes and various parameters, like residual battery power, consumption of energy per packet and energy needed per transmission. A new technique is proposed in this paper to enhance the routing efficiency by making use of lion optimization algorithm after identifying all possible paths in the network. This technique not only enhances the energy efficiency of each node but also the performance metrics.

Design of Wide-band Power Amplifier based on Power Combiner Technique with Low Intermodulation Distortion Mussa Mabrok; Zahriladha Zakaria; Nasrullah Saifullah
International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 5: October 2018
Publisher : Institute of Advanced Engineering and Science

RF power amplifiers are one of challenging blocks in designing radio frequency transceivers, this is due to non-linearity behavior of power amplifiers that leads to inter-modulation distortion. This paper presents the design of wide-band power amplifier which combined with parallel coupled line band pass filter at the input and output of power amplifier to allow the only required frequency band to pass through the power amplifier. Class-A topology and ATF-511P8 transistor are used in this design. Advanced Design System software used as a simulation tool to simulate the designed wide-band power amplifier. The simulation results showed an input return loss (S11) which less than -10dB, and gain (S21) is higher than 10 dB over the entire frequency band and considers as flat as well. The designed amplifier is stable over the bandwidth (K>1). Inter-modulation distortion is -56.919dBc which is less than -50dBc with 10dBm input power. The designed amplifier can be used for the microwave applications which include weather radar, satellite communication, wireless networking, mobile, and TV.

Performance analysis of Ultra-wideband RF switch using discrete PIN diode in SC-79 package for medical application of microwave imaging Noor Azwan Shairi; Nursyahirah Mohd Sanusi; Adib Othman; Zahriladha Zakaria; Imran Mohd Ibrahim
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 6: December 2019
Publisher : Institute of Advanced Engineering and Science

Microwave imaging is an emerging technology in the medical application which have similar functions as X-ray, Magnetic Resonance Imaging (MRI), and Computed Tomography scan (CT scan). In designing a microwave imaging system for medical application, it can use a monostatic radar approach by transmitting a Gaussian pulse (with an ultra-wideband (UWB) frequency). In this system, eight antennas are required with the support of RF switches. Thus, it is important to get the best performance of UWB RF switch in this application. Therefore, this paper presents the performance analysis of four different RF switch topologies (Design 1, 2, 3 and 4) using discrete PIN diode in SC-79 package. The design was based on single pole double throw (SPDT) switch. As result, Design 2 is the best topology after considering the tradeoff between isolation and return loss performances. Based on the three cascaded SPDT switches of Design 2, the insertion loss was less than -2 dB and return loss was more than -10 dB. Meanwhile, the isolation bandwidth (at the minimum isolation of -20 dB) was from 0.5 to 3.7 GHz (with 3.2 GHz bandwidth), hence, it could be used in the UWB frequency for medical application of microwave imaging.

Co-Authors A. A. Md Isa A. Ahmad A. R. Othman Abdullah M. Zobilah Adib Othman Adib Othman Ahmed Ismail Abu-Khadrah Ahmed M. Dinar Amirul Aizat Zolkefli Ammar Alhegazi Anwar Faizd Osman Ariffuddin Joret Azahari Salleh Badrul Hisham Ahmad Faza Syahirah Mohd Noor Herwansyah Lago Herwansyah Lago Huda A. Majid Huda A. Majid Imran Mohd Ibrahim Ismail Bin Mohd M . K. Abdulhameed M. K. Abdulhameed Maizatul Alice Meor Said Mohamad Harris Misran Mohamad Zoinol Abidin Abd Aziz Mohd Fareq Abdul Malek Mohd Haizal Jamaluddin Mohd Khairy Ismail Mohd Mawardy Abdullah Mohd Nor Husain Mothana L. Attiah Mowafak K. Mohsen Muhajir Mustapa Muhammad Faiz Liew Abdullah Muhammad Suhaimi Sulong Mussa Mabrok Naim Che Pee Nasrullah Saifullah Noor Azwan Shairi Nornikman Hassan Norshidah Katiran Nur Ishmah Sabirah Shaari Nurhasniza Edward Nursyahirah Mohd Sanusi Rammah A. Alahnomi Rammah A. Alahnomi S. Alani Sajjad Ahmed Sam Weng Yik Sameer Alani Sharif Ahmed Siti Nadzirah Salleh Tole Sutikno Yosza Dasril Yully Erwanti Masrukin Yully Masrukin

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Journal : International Journal of Electrical and Computer Engineering