M.F. Ain

M.F. Ain
Universiti Sains Malaysia | USM · School of Electrical and Electronic Engineering

BEng(Electronic Comm), MSc(Microwave Eng), PhD

About

255
Publications
76,211
Reads
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1,958
Citations
Citations since 2017
80 Research Items
1298 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250

Publications

Publications (255)
Article
Full-text available
This paper presents soil mass movement monitoring for landslides detection using low-cost MEMS accelerometer as inclinometer. Commercial inclinometers for geotechnical ground observations are quite expensive. This research aims to study and develop low-cost inclinometer as an alternative using accelerometer. The output of the low-cost accelerometer...
Article
Full-text available
The deployment of the millimeter (mmWave) frequency spectrum by fifth-generation (5G) device-to-device (D2D) wireless networks is anticipated to meet the growing demands for increased capacity. The antenna is regarded of as an important determinant that guarantees the maximum performance of wireless communication. This paper presents a low-profile...
Article
This letter presents a dual-element multiple-input–multiple-output antenna for applications in the very high frequency band. A compact geometry of microstrip line-fed radiators engaging 0.04 $ \times $ 0.04 ${{\boldsymbol{\lambda }}}^2$ footprint at 150 MHz was fabricated on an FR-4 substrate and tested in the anechoic chamber. Good circularly...
Chapter
In this paper, a multiple-input multiple-output (MIMO) antenna for 36 GHz mmWave communications is presented. The antenna configuration includes two radiators having the similar profiles. These radiators are positioned diagonally on opposite sides of the antenna assembly to generate circular polarization. Furthermore, each radiator is loaded with a...
Chapter
In the preparation of a microstrip patch antenna, the selection of the conductive radiating material, substrate material, and their thicknesses are extremely crucial. Therefore, a designer should possess a good understanding of the antenna output effect upon varying the conductive radiating and substrate materials, as well as their thicknesses. The...
Chapter
Full-text available
There is a rising prospect for producing more efficient, widely affordable and eco-friendly microwave absorbers. Much research has demonstrated the efficacy of low-cost absorbers, particularly those made of sustainable carbonaceous and rubber-based materials structured into a hollow pyramidal shape. Natural rubber possesses outstanding resilience,...
Article
Full-text available
The use of microstrip patch configuration in the 5th generation (5G) wireless network is expected to fulfill the demands of smartphone users by significantly increasing the capacity of communication technology. The main objective of this paper is to report the development of a mathematical model on the effects of conductor thickness on the center f...
Article
Full-text available
The revolutionary microstrip technology for wireless communication suffers from relatively large size and low radiation efficiency when modeled for the current challenging hardware. An efficient solution to this subject is the quasi-lumped element (LE) approach. Therefore, this manuscript is a tutorial on the progress in quasi-LE resonator antennas...
Article
Full-text available
A simple arrangement of wheel-shaped copper microstrip antenna is presented for operation in the 24 GHz frequency band. In this structure, a coaxial feed probe was utilized to generate vertical polarization, and a wheel-shaped microstrip with four coupling arms was used to produce horizontal polarization. An antenna comprising of two copper sheets...
Conference Paper
Full-text available
This paper presents a circular-shaped copper (Cu)-based antenna for 28 GHz mmWave applications. The proposed design employs air as a substrate to substantially reduce the manufacturing cost. The coaxial probe feed technique was utilized to excite the system. Experimental results confirm that, by integrating a pair of rectangular slots at one of the...
Article
Partial discharge (PD) is a phenomenon that may lead to dielectric breakdown and can provide important information for condition monitoring on electrical power equipment, in particular transformer. One of the methods is the detection of the electromagnetic (EM) wave signal emitted by PD. Although the frequency spectrum in EM is very wide, this pape...
Article
Full-text available
The increasing applications for nomadic computing have experienced enormous development over the preceding decade. This has eventually caused the lack of bandwidth. Therefore, to accomplish the need of consumers, compact antennas shall be designed for mmWave wireless communications. Consequently, this paper presents a novel negative meander line ba...
Conference Paper
Full-text available
In this paper, a 28-GHz dual 2 × 2 U-slot air substrate patch antenna array for 5G application is proposed. The idea of the U-slot antenna was applied in the patch antenna design which intended to decrease the antenna size. The structure of the U-slot patch antenna comprises a patch, two slots of U-shape, a ground plane, and coaxial feed lines. The...
Article
Full-text available
A wideband hybrid dielectric resonator antenna (DRA) consisting of a rectangular slot patch and a perforated stacked cylindrical dielectric resonator (DR) is proposed. A rectangular slot was etched on the grounding side of a microwave laminate (ϵs =3.38) to excite the hybrid resonator at a high frequency. The stacked DR used consists of three diffe...
Article
Full-text available
The use of microstrip patch configuration in the 5th generation (5G) wireless network is expected to fulfill the demands of smartphone users by significantly increasing the capacity of the communication technology. The main aim of this paper is to disclose the development of a mathematical model on the effects of conductive material and substrate t...
Article
Full-text available
Over the decade, extensive applications of portable electronic devices have progressed enormously. This has ultimately influenced the shortage of bandwidth supply. Therefore, in satisfying the demands of consumers, low-cost antennas are required to be designed specifically for the fifth-generation frequency spectrum (5G) devices. The main goal of t...
Article
Full-text available
Carbon black-TiO2 composite counter electrode was synthesized via solid state method and subsequently annealed at different annealing temperatures (450–550 °C). The composite was investigated as a counter electrode, acting as an alternative to platinum in a dye-sensitized solar cell. The aim is to obtain a higher conversion efficiency of solar ener...
Article
In this study, DRAs produced using CaCu3Ti4O12 (CCTO) as a high dielectric material (εr) was added with BaO‐SrO‐Nb2O5‐B2O3‐SiO2 (BSNBS) glass for possible tunability in a wideband frequency range. BSNBS glass (0.01‐1 wt.%) was mixed with CCTO powders (calcined) and compacted at 250 MPa into mixed‐powder pellets. All the green body samples were then...
Conference Paper
In multiuser millimeter wave (mmWave) multiple input multiple output (MIMO) systems, obtaining accurate information/knowledge regarding the channel state is crucial to achieving multiuser interference cancellation and reliable beamforming (BF)−to compensate for severe path loss. This knowledge is nonetheless very challenging to acquire in practice...
Article
Formulated, processed, and dried Aloe polysaccharides thin film sandwiched between ITO as bottom electrode and Au as top electrode has been adopted as an artificial synapse to emulate behavior of neuromorphic computing. The synaptic plasticity or weight has been modulated with this simple metal-insulator-metal structure by applying voltage sweep an...
Conference Paper
Full-text available
In telecommunication, the revolutionary multiple input multiple output (MIMO) antenna technology plays a vital role in multiplying the radio link capacity. Therefore, the MIMO systems are considered as essential components for various wireless standards. Taking into account the increasing demand of consumers, devices employing miniature printed ant...
Article
Full-text available
The extending applications for mobile computing have experienced immense progress over the previous decade. However, this has ultimately influenced the shortage of bandwidth. Therefore, to fulfill the consumers' demand, inexpensive antennas need to be uniquely designed for the next/fifth generation (5G) frequency spectrum. Consequently, this paper...
Conference Paper
Full-text available
The increasing applications for nomadic computing have experienced enormous development over the preceding period. This has eventually prejudiced to the lack of bandwidth. Accordingly, to fulfill the consumers' necessity, economical radiating elements needs to be constructed for the next generation wireless network. As a result, this paper presents...
Article
Full-text available
Millimeter wave (mmWave) multiple-input-multiple-output (MIMO) systems will almost certainly use hybrid precoding to realize beamforming with few numbers of RF chains to reduce energy consumption, but require low complexity technique to improve spectral efficiency. While energy-efficient hybrid analog/digital precoders and combiners designs can sub...
Article
Doubly selective (DS) channel estimation for the downlink massive multiple-input-multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems is a challenging problem, due to the requirements on high pilots overhead and prohibitive complexity. In this paper, by exploiting the highly correlated spatial structure of the obtained arr...
Article
Full-text available
The rapid progress in electronic applications for moveable devices requires the conductive matrix to be not only flexible but also stretchable. A simple microstrip patch antenna was fabricated based on silver ink polysiloxane composite with stretchable polysiloxane substrate at resonance frequency of 2.50 GHz. It is designed at post-percolation thr...
Article
The switching behaviors of polysaccharides-based resistive random access memories change substantially depending on the electrical inputs. Here, the switching dynamics of the device are presented by varying the applied current compliance ( ${I}_{\text {CC}}$ ) and voltage sweeping rate ( $\nu $ ). The results show that the device resistance in th...
Article
Calcium copper titanate (CCTO) thin films were deposited on indium tin oxide (ITO) substrates using radio frequency (RF) magnetron sputtering, at selected Ar:N2 flow rates (1:1, 1:2, 1:4, and 1:6 sccm) at ambient temperature. The effect of Ar:N2 flow rate on the morphology, optical and electrical properties of the CCTO thin films were investigated...
Article
Full-text available
CaCu 3 Ti 4 O 12-xWO 3 (CCTO-xWO 3) (x = 5, 10, 15, 20 wt%) ceramic composites were synthesized using conventional mixed oxide method. The effect of various amounts of WO 3 loading on its microstructure, electrical and dielectric properties of CCTO ceramic composites were studied using XRD, FESEM-EDAX, Hall effect and dielectric measurement. XRD an...
Article
In this study, the relationship between dielectric properties and sintered sample thickness (d)(0.41–2.74 mm)of CaCu 3 Ti 4 O 12 (CCTO)ceramics prepared at 1000–1100 °C in air was investigated. Compacted green ceramic bodies in varying weights and sintered at different temperatures were prepared to obtain ceramics with varying thicknesses. The samp...
Conference Paper
The effect of SrO-B2O3-SiO2 (SBS) glass addition into CaCu3Ti4O12 (CCTO) on the dielectric properties and wideband frequency of CCTO-glass composites was studied. CCTO ceramics and SBS glass were prepared via solid state mixing method. The raw materials of CCTO were wet mixed for 24 hours and dried overnight in an oven. CCTO mixtures were calcined...
Conference Paper
Full-text available
The influence of La2O3 addition (x = 1,3,5 and 7 wt.%) on phases formation, microstructural and electrical properties of ZTA ceramic prepared via conventional solid-state method was studied by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Hall Effect measurement, respectively. The XRD peaks show the presence of three differe...
Conference Paper
Synthesis of CaCu3Ti4O12(CCTO) through solid state reaction route is a common method used by researchers and industries because this technique offers easier of handlings and only a few parameters involved to obtain single phase of CCTO. More investigations on solid state reaction route can keep optimized this route by considering all synthesis stag...
Conference Paper
Full-text available
This work aims to identify the effect of samarium (Sm) doped in YIG by using conventional solid-state reaction. The investigation was carried based on 2Y3-xSmxFe5O12 (Smx; x = 0.1-1.5). It is found that from X-ray diffraction analysis (XRD) associated with Rietveld refinement, secondary phases such as YIP/SIP, hematite and yttria were detected. The...
Conference Paper
The samples have undergone XRD analysis, morphological, dielectric and tensile tests. XRD analysis confirmed that the silicone rubber/CCTO composites have reacted when blended and the crystal structure changed from its original phase of CCTO and silicone rubber, respectively. SEM tests show that silicone rubber/CCTO has great cohesion of silicone r...
Article
Full-text available
In this study, a modified curve fitting model (CFM) for cylindrical dielectric resonator antenna (DRA) exclusively using YIG resonator with excess Fe2O3 is proposed. The modified CFM is used to accelerate the analysis of YIG resonator antenna (YRA) without having to repeat the characterization process for similar resonator. Modification of CFM is d...
Article
Addition of various glasses has successfully reduced tan δ of CCTO‐based ceramics. Less amounts (0‐1.0 wt.%) of glasses (BaO‐SrO‐Nb2O5‐B2O3‐SiO2 (BSNBS) and SrO‐B2O3‐SiO2 (SBS), respectively) were added into pure CCTO and sintered at 1040 °C for 10 hours. The phase formation and microstructure of each sample were characterized using XRD and SEM, re...
Article
Full-text available
Microbubble floating in liquid dielectric and subjected to an electric field may initiate partial discharge (PD). This paper studies the parameters that affect the initiation through a computer simulation. This study inspects how the type of gas inside the microbubble, the size of the microbubble, distance from an electric field, Eo, source and, th...
Article
Full-text available
The dielectric properties of CCTO ceramics with soda-lime glass addition was investigated. The addition of soda lime glass was varied from 0 - 0.05 wt.% by solid-state reaction. Both XRD patterns of CCTO and CCTO-glass sintered samples showed the formation of CCTO phase with minor peaks of CuO phase, respectively. The phase area analysis of CCTO an...
Article
Full-text available
In the present work CCTO thin film has successfully deposited on FTO substrate in a non-reactive (argon) atmosphere with frequency (RF) magnetron sputtering at 300 W. This work aims to determine the structural, morphological and optical properties of thin film using X-ray diffraction (XRD), atomic force microscopy (AFM) and Ultraviolet–visible spec...
Article
Full-text available
Effect of glass addition on the phase formation and microstructural evolution of CCTO ceramics for energy storage capacitor was studied. CCTO and CCTO-borosilicate glass based ceramics (0-1 wt.%) were prepared by solid state reaction method. The powders were pressed at 250 MPa and were sintered at 1040 °C for 10 hours. XRD analysis illustrates the...
Article
A Ka-band oscillator based on the principle of negative resistance is analyzed and modelled. A novel stable frequency source based on balanced parallel-coupled dielectric resonator feedback system is devised to achieve considerable spectral purity and good power output at the target ka-band resonance. Dual negative conductance feedbacks are configu...
Conference Paper
Full-text available
Partial discharge (PD) is one of the most effective conditions monitoring for electrical equipment such as a transformer. Detecting PD, especially inside the transformer, is made possible through several methods. One of the methods is by detecting UHF signal emitted by PD. Although UHF detection method can be applied on site, a lot of research was...
Article
CaCu3Ti4O12 (CCTO) thin film was deposited on ITO substrate using radio frequency (RF) magnetron sputtering at various deposition times (1–4 h). The significant effects of deposition time on the structural, morphological, optical and electrical properties were systematically investigated using XRD, AFM, FESEM, UV–Vis, and Hall Effect measurements....
Article
In this paper, counter electrodes based on carbon black (CB)-TiO2 composite are proposed as a cost-effective alternative to conventional Pt counter electrodes used in dye-sensitized solar cell (DSSC) applications. CB-TiO2 composite counter electrodes with different weight percentages of CB were prepared using the solid state method and coated onto...
Article
Cite this article as: Mohsen Ahmadipour, Nik Akmar Rejab, Mohd Fariz Ab Rahman, Mohd Fadzil Ain and Zainal Arifin Ahmad, High sensitivity and selectivity of CaCu 3 Ti 4 O 12-ZnO composites towards acetone gas at room t e m p e r a t u r e , Ceramics International, https://doi. Abstract: Detection of low concentration of acetone gas was carried out...
Article
CCTO thin films are of great importance for applications in various electronic devices. CCTO thin films with 200 nm thickness were grown on Al2O3, ITO substrates by radio-frequency (RF) magnetron sputtering at a temperature of 300 °C. The crystallographic properties of the thin films were studied by X-ray diffraction (XRD), and their morphologies w...
Article
Full-text available
Natural dyes extracted from Eleiodoxa conferta and Garcinia atroviridis were used for the first time as photosensitizers in dye-sensitized solar cells (DSSCs). Anthocyanin was identified as the main pigments that sensitize the semiconductor of TiO2 film. Anthocyanin pigment contains hydroxyl and carboxylic groups in the molecule that can attach eff...
Article
Artificial neural networks (ANNs) have been used to model microwave and RF devices over the years. Conventionally, S-parameters of microwave/RF designs are used as the inputs of neural network models to predict the electrical properties of the designs. However, using the S-parameters directly as inputs into the ANN results in a large number of inpu...
Conference Paper
Partial discharge (PD) offers a glimpse into the health of an electrical insulation. The incidence of PD is widely monitored in electrical power system equipment including oil-filled power transformer. Among the technique applied for the monitoring is the detection of ultra-high frequency (UHF) signal from PD incident. This technique has been demon...
Article
This article examines a noval series-fed triangular microstrip ring resonator (TMRR) antenna array. Each radiating element is made up of a wavelength-long microstrip line with the two ends joined together to form an isosceles triangle. The antenna array is fed by an N-shaped microstrip feed line and excited by a coaxial feed probe. The operational...
Article
The intent of this study is to realize efficient wideband DRA using unbiased low permittivity yttrium ion garnet (YIG) with excess Fe2O3. The fabricated YIG resonators with the same dimension but different ɛr are used together to produce wideband stacked YIG resonator antenna (YRA). Three stacked YIG resonators with excess Fe2O3 of 8% (YR8), 14% (Y...
Conference Paper
Full-text available
Solar Powered Street Lights is a project that can be served to School of Electrical & Electronic Engineering (SEEE), Universiti Sains Malaysia in electricity cost savings by implementing the existing solar Photovoltaic (PV) system used for a green technology of energy efficiency. Due to the electricity of the national grid Tenaga Nasional Berhad (T...
Chapter
Full-text available
An approximate LC lumped element equivalent circuit model antenna array for RF harvesting is presented. The array consists of two identical parallels of a resonant circuit that aimed to provide an alternative energy sources for energizing low power devices. The entire structure of spiral inductor array exhibits an aperture size of 14.3 mm × 7.0 mm...
Chapter
This paper reports the passive frequency multiplier designs used to obtain a pre-determined multiplies output frequency of 20 to 26 GHz in modern communication system. The performances between the simulated lumped frequency multiplier modeling design and the Monolithic Microwave Integrated Circuit (MMIC) frequency multiplier design are going to be...
Chapter
This paper reports the architecture design of 26–32 GHz downconverter passive double-balanced mixers used for RF front-end circuit design. The performance of the simulated lumped hybrid-ring coupler double-balanced mixer and the monolithic microwave integrated circuit (MMIC) double-balanced mixer are going to be compared throughout this paper. Both...
Article
Full-text available
CaCu3Ti4O12 (CCTO) thin films with a thickness of 200 nm were deposited on ITO substrates by RF magnetron sputtering using a pure CCTO target. After the deposition, thin films were annealed at 400, 450, 500 and 550 °C, respectively, for 1 h. The effects of annealing temperature on the structural, surface morphology, optical properties and resistivi...
Article
An attempt has been made to investigate the relationship between different composition of CaCu3Ti4O12 (CCTO)/epoxy to the microstructural, dielectric and mechanical properties respectively. CCTO powder had been produced through solid state reaction method using CaCO3, CuO and TiO2 as the raw materials. They were mixed at stoichiometric ratio and ca...
Article
CaCu 3 Ti 4 O 12 (CCTO) is an electroceramic material with complex cubic perovskite-like oxide. It possessed a giant dielectric constant of about 10 ⁵ over a wide temperature range (100-600 K). In this work, CCTO was synthesized through solid state method. The effect of different heating rate during sintering process was studied. The raw materials...
Article
An X-band tunable microwave low-phase noise planar oscillator employing a novel-fed dielectric resonator (DR) with a single transistor has been investigated and realized. A ZrSnTi oxide composite ceramic-based DR with dielectric permittivity of 95 enclosed in a metallic cavity with an unloaded Q factor of 5,000 at 10 GHz is proposed. The resonant f...