Rosemizi Abd Rahim
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Preferred name
Rosemizi Abd Rahim
Official Name
Rosemizi, Abd Rahim
Alternative Name
Rahim, Rosemizi Abd
Rahim, R. A.
Abd Rahim, Rosemizi Bin
Abd Rahim, Rozemizi Bin
Rahim, Rosemizi Bin Abd
Abd Rahim, Rosemizi
Rahim, Robbi
Main Affiliation
Scopus Author ID
26633306100
Researcher ID
CBN-9890-2022

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  • Publication
    Self-harmonics suppression rectenna for wireless power harvesting
    ( 2014)
    Rosemizi Abd Rahim
    The development and analysis of several designs of self-harmonic suppression rectenna for the wireless power harvesting system are presented. The purpose of self-harmonic suppression rectenna is to eliminate the using of a harmonic filter circuit in filtering the harmonic radiation and electromagnetic interference (EMI) in rectenna system. The motivation for this work has been inspired by the need for compact size, low cost, high efficient rectenna system and also very important is the design structure is simple in order to reduce the error during the fabrication process. In the response to these challenging demands, four designs of self-harmonic suppression microstrip patch antenna have been simulated, fabricated, measured and analysed. Two designs can be classified in linear polarization while the other two designs exhibit the circular polarization properties. The technique to suppress the harmonics which have been introduced are the slits, slot and notch at the patch structure and an open stub at the microstrip feeding line. Also, a defected ground structure technique is applied to reduce the size of the patch antenna. The perturbation technique has been introduced to the basic rectangular and circular shapes microstrip patch antenna to produce circular polarization property. As a result, the rectangular shape becomes a nearly-square shape, while the circular shape becomes an elliptical-shape. Subsequently, a dual polarization of circularly polarized property is also proposed. To obtain high output voltage, a self-harmonic suppression microstrip patch array antenna is developed. For conversion of RF-to-DC signal, a few designs of rectifier circuits are proposed. The proposed rectifier matching networks are capable to provide a good impedance matching with a wide range of incident power. All the simulation has been done by using CST Microwave Simulator and Advanced Design System (ADS). To validate the theory and simulation, the prototypes of all designs have been fabricated and measured. For the comparison, the prototype of the conventional linear polarization (LP) rectangular and circular microstrip patch antenna are also have been designed and fabricated. The measurements show an excellent result and is in line with the simulated result. The measured of the return loss of the antennas show it resonate at the fundamental frequency, while at the harmonic frequencies, the magnitude of the return loss were suppressed successfully. In the wireless power harvesting system experimental work, it is seen that a significant improvement of the output power is achieved compared to the reference antenna without harmonic suppression. All design has been realized by using a standard PCB process. Therefore, the fabrication technique is very simple with a very cheap cost, thus it can be conveniently mass-produced.
  • Publication
    Piezoelectric Array Configuration Technique into Enhance Power Catchment for Sound Energy Harvester System
    ( 2020-11-18)
    Liew Hui Fang
    ;
    Rosemizi Abd Rahim
    ;
    Muhammad Izuan Fahmi Romli
    ;
    Mohamad Zhafran Zakariya
    ;
    Junaidah Ali Mohd Jobran
    ;
    Norhanisa Kimpol
    The objective of this study is to explore the harvest maximum output changes occurs in piezoelectric transducer when connected in different configuration to produce highest electricity consumption and generate sound energy harvesting system. Acoustic energy is a type of environmental energy source that can be extracted and converted into electrical energy for small-scale energy applications. In this study, the corresponding load resistance for single piezoelectric transducer is 4.5 k$\Omega$, together with a constant vibration source at a frequency of 68 Hz and a 1-g acceleration. The performance of output voltage and power of piezoelectric are evaluated and the optimum output is measured by depending on the connection of the piezoelectric transducer arrangement into series, parallel and series, and parallel which stimulated using Proteus software. The experiment result presented that, when have single piezo, 5 piezo connected in series, and 5 piezo connected in parallel, the output powers are 1.664 mW, 1.671mW and 7.676 mW, respectively. During the combination series and parallel connections, the output power of 3S1P piezo increases to 5.05mW. In a parallel configuration, the output voltage that produced is much higher than a piezoelectric transducer arrangement connected in series connection. The piezoelectric transducer that connected in parallel configurations increases its voltage output from 2.83 V to 13.05 V with the same polarity. The arrangement of piezoelectric transducer in parallel configuration is affordable, with its higher production of a higher power output compared to the arrangement of piezoelectric transducer in series connection. Whereas in terms of power output, the maximum power remains constant in the range of 1.665 to 1.671 mW when three transducers are in series configuration connection with the same polarity. In conclusion, the proper implementation of the piezoelectric array configuration is needed in order to operate the minimum energy for low load devices and promise to accomplish generated optimum power output in harvester system.
  • Publication
    Review Article of Radio Frequency and Microwave Heating Treatment to Disinfest Kutu Beras in Malaysian Rice
    ( 2017-12-11)
    Siti Zulaika Abdul Nyzam
    ;
    Rosemizi Abd Rahim
    ;
    Hasliza A Rahim @ Samsuddin
    This article presents the basic principle of radio frequency (RF) and microwave heating and its application in agricultural sector specifically to control rice insects for storage purpose. Experiment findings of the past few years are highlighted according to the heating mechanism which influence the response of rice and insect exposed to the microwave field.
  • Publication
    Review of Active Circuit and Passive Circuit Techniques to Improve the Performance of Highly Efficient Energy Harvesting Systems
    ( 2023-06-01)
    Liew Hui Fang
    ;
    Rosemizi Abd Rahim
    ;
    Muhammad Izuan Fahmi Romli
    ;
    Junita Mohd Nordin
    ;
    `Aini Syuhada Md Zain
    In piezoelectric energy harvesting systems, energy harvesting circuits are the interface between piezoelectric devices and electrical loads. The conventional view of this interface is based on the concept of impedance matching. In fact, in the power supply circuit can also apply as an electrical boundary conditions, such as voltage and charge, to piezoelectric devices for each energy conversion cycle. The major drawback of piezoelectric power harvesting have low-power relationships in systems within (in the range of μW to mW), then system also have significantly reduced any potential losses in circuits that make up the EH system, whereas other condition into careful selection of circuits and components can enhanced the energy harvesting performance and electricity consumption. In the study of energy harvesting systems, it is an energy harvesting system approach that using active and passive electronic circuit to control voltage and or charge on piezoelectric devices as proposed and review to mechanical inputs for optimized energy conversion. Several factors in the practical limitation of active and passive energy consumption, due to device limitations and the power efficiency of electronic circuits, will be introduced and have played an important role into to enhance optimum and increase efficiency of energy harvesting system.
      1
  • Publication
    Development of Highly Efficient Hybrid Kinetic-Solar Energy Harvesting System
    ( 2023-01-01)
    Liew Hui Fang
    ;
    Rosemizi Abd Rahim
    ;
    Muhammad Izuan Fahmi Romli
    ;
    Junita Mohd Nordin
    ;
    `Aini Syuhada Md Zain
    ;
    Mujahidin N.M.D.Z.
    The development of sustainable and efficient energy harvesting systems has become critical in meeting global energy demands. Hence, the goal is to combine the kinetic energy created via footsteps alongside solar energy to maximize energy conversion and develop a sustainable power source. The research entails designing and optimizing the hybrid system, while selecting appropriate materials, and implementing advanced power management techniques for effective energy utilization. Therefore, in order to improve the efficiency of energy harvesting via the system, further research on voltage input for solar panels and piezo buzzer efficiency arrangements on slabs were conducted. Whereby, the tile cells generate electricity when someone walks across it. However, this energy output needs to be regulated using a voltage multiplier and an alternating current into direct current (AC-DC) converter. To accomplish this, an experiment on the outcomes for output parameter with stand-alone photovoltaic (PV) harvesting system in 6 days, piezoelectric (PZ) harvesting system with students weighing 60kg and 70kg in 14 steps and a power hybrid harvesting system was carried out. Overall, the findings of this study indicate that the proposed method is functional and can be verified by the system, with an average output of 9.46 V and 126.6 mA produced. Also, this study demonstrates the significant potential of hybrid kinetic-solar energy harvesting system in improving energy sustainability and promoting self-sufficient power generation for a variety of applications, including remote sensing, wireless sensor networks, and internet of things (IoT) devices, through experimental evaluations and simulations.
      1
  • Publication
    Modelling and Analysis of Piezoelectric Cantilever for Kinetic Ambient Energy Harvesting
    ( 2024-01-01)
    Izzati Kholid N.F.
    ;
    Junita Mohd Nordin
    ;
    Rosemizi Abd Rahim
    ;
    `Aini Syuhada Md Zain
    ;
    Liew Hui Fang
    ;
    Alif M.H.
    Wide bandwidth of vibration energy harvesters becomes one of most difficulties to their implementation but it is important to have cantilever beam that can tolerate wide variety of input frequency and able to harvest more kinetic energy. In this work, the piezoelectric material i.e. lead-zirconate-titanate (PZT), polyvinylidene fluoride (PVDF) and Aluminum Nitride (AlN) have been chosen to be analyzed. The piezoelectric cantilever beam structure, Unimorph type with dimension length of 40mm, 10mm width and thickness is 0.5mm has been proposed. The Finite Element Method (FEM) in ANSYS which consist of modal analysis, harmonic response analysis and statis structural analysis have been used to analyzed the characteristic of piezoelectric materials. Then, the full-bridge rectifier used to convert A-C to D-C sources using MATLAB Simulink and the experimental setup of the project was designed. The modal analysis result showed that PVDF material can applied greater maximum deformation than AlN and PZT material. The effect of dimension of cantilever beams of PVDF against natural frequency with different mode showed the natural frequency decrease when the dimensions of piezoelectric cantilever beam increase. On static structural analysis showed when the dimensions were increased, then the total deformation was decreased. Based on result of rectifying circuit for piezoelectric energy harvester using MATLAB Simulink, the positive and negative half cycle were conducted as theoretical studied. For the design verification, the experimental study showed the output voltage waveform is well regulated with minimum ripple.
      1