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In recent times, the Gas District Cooling (GDC) plant in Universiti Teknologi PETRONAS (UTP) has suffered faults throughout the power system network due to many reasons. It was reported that third harmonic component exists in its fault current. Synchronous generator is one of the triplen harmonic sources and third harmonic is the major component. Therefore, this paper intends to study the contribution...
Modern communication systems are required to be compact in size; hence devices building up the system face the challenge to be miniaturized. An iterative designed Bowtie shaped two pole planar bandpass filters utilizing triangular substrate integrated waveguide (SIW) resonators are presented. The triangular cavity design structure is presented; and the coupling of two cavities forms the first iteration...
This paper presents the design, modeling, and simulation of a multiple resonant MEMS vibration energy harvester (VEH) suitable for wireless sensor network (WSN) applications. Since ambient vibration has a frequency of 100 Hz and below, a multiple resonant harvester will be an advantage to increase the vibration frequency and hence the output voltage produced by the device. The high frequency harvester...
This paper proposes a development of a Multi-input DC-DC Converter (MIDC) for Hybrid Renewable Energy Generation System (HREGS). The aim is to reduce the number of power converter and cost. The proposed MIDC consists of a DC-DC converter and a single phase full bridge DC-AC inverter. The renewable energy (RE) sources such as photovoltaic (PV) array, wind turbine (WT), hydrogen fuel cell (HFC) and...
This paper highlights input variable selection for neural network of the electrical system to predict the load demand in 168 hours ahead. Autocorrelation (ACF), partial autocorrelation (PACF) and cross correlation (CCF) analysis are used to identify the correlated input for the forecast model. The combination of time, time indicator, lagged load and respective weather variables are considered as forecast...
An end-coupled line bandpass filter (BPF) is proposed and designed by placing defected ground structure (DGS) in the ground plane. DGS is used for its property of miniaturizing the size of microwave filter and also improving the mutual coupling between the resonators. The proposed dumbbell shaped DGS is used to tune the bandpass filter to 2.4 GHz with dimension of 44 mm × 18 mm. A wide tuning range...
A single element circular slot aperture coupled Cylindrical Dielectric Resonator Antenna (CDRA) with a parabolic reflector is simulated and presented. The measured bandwidth of the single element CDRA is about 1.8 % (5.32 – 5.52) while the simulated bandwidth is 1.11% (5.32 – 5.44 GHz). A comprehensive parametric study has been conducted to realize the effects of reflector parameters to increase the...
The paper is to propose a multi-input power converter (MIPC) for hybrid photovoltaic (PV) array, wind turbine (WT), fuel cell (FC) and battery storage (BT) connected AC grid network. The aim is to simplify the power system and reduce the cost. The proposed MIPC consists of a dc-dc converter and a dc-ac inverter. The output power characteristics of the PV array, WT and FC are introduced. The perturbation...
A stepped impedance resonator bandpass filter (SIR BPF) is proposed and designed by placing defected ground structure (DGS) in the ground plane. DGS is used for its property of miniaturizing the size of microwave filter and also improving the mutual coupling between the resonators. The proposed dumbbell shaped DGS is used to tune the bandpass filter to 2.4 GHz with dimension of 28 mm × 30 mm. A wide...
In this paper, theoretical and experimental study on cylindrical dielectric resonator antenna (CDRA) made of CCTO material is reported. The CDRA with high dielectric constant (εΓ = 55) is fed with aperture coupled 50 ς microstrip transmission line. The TE011+S mode of CDRA is excited to operate at 5.15–5.35 GHz for wireless local area network (WLAN) application. The electrical model of the aperture...
In this paper, electrical models of single element cylindrical dielectric resonator antenna (CDRA) and two element CDRA array made of Calcium Copper Titanium Oxide (CCTO) material are presented. The 50 δ microstrip transmission line is used to excite the CDRAs through coupling slots etched on the ground plane. The electric models of single element CDRA and two element CDRA array are designed by using...
A planar bandpass filter based on a technique that utilizes quarter mode of substrate integrated waveguide (SIW) is presented. This concept reduces the circuit foot print of SIW to a quarter of its size, along with miniaturization good performance and high quality factor is maintained by the structure. The design concept for single-pole resonator structure is presented; and by coupling the resonators...
A single element circular slot aperture coupled Cylindrical Dielectric Resonator Antenna (CDRA) with a box shaped reflector is designed and presented. The simulated bandwidth achieved for the designed antenna is about 1.11% (5.32 GHz–5.44 GHz) while the measured bandwidth is about 1.8% (5.32 GHz–5.52 GHz). This method enhances the directivity of the CDRA upto 53% i.e from 5 dBi to 7.5 dBi. The analysis...
With the fast development in the ubiquitous computing and wireless sensing technologies, a new era of smart cities is evolving. Future smart cities will gather sensory data, needed for effective management of the city, using wireless sensor networks. Exhaustive power sources such as batteries need periodic replacement and hence increase the cost of ownership of wireless sensor network. On the other...
Artificial neural networks (ANN) are receiving a lot of attention because of their nonlinear mapping ability in the field of short term load forecast (STLF). ANN based STLF model commonly use back propagation algorithm, that may not converge properly, that affects the forecast accuracy. A hybrid approach, based on artificial neural network (ANN) and genetic algorithm (GA) that combines the advantages...
This paper reports on an electromagnetic vibration energy harvester that utilizes a novel method of energy pumping based frequency up-conversion to effectively harvest energy from a broad range of low frequency (<18Hz) ambient vibrations. Energy from low frequency vibrations is absorbed by a low frequency bounded resonator and subsequently pumped, in the form of pulses, to a high frequency resonator...
A 1 × 3 element linear array of cylindrical dielectric resonator antenna (CDRA) is designed and presented for 802.11a WLAN system applications. The two elements of CDRA array are excited by rectangular shaped aperture slots placed on the ground plane, while the slots themselves are excited through the microstrip line. The third element (i.e., central CDRA) is excited through the mutual coupling of...
In this paper, the tuning technique of 3-elements cylindrical dielectric resonator antenna (CDRA) array for wireless LAN 802.11 a/b/g standard applications is studied experimentally. The rectangular shaped aperture slots are used to excite the first and last radiating element. The aperture slots etched on the ground plane are excited by using the 50Ω microstrip transmission line. The electromagnetic...
A single element circular slot aperture coupled Cylindrical Dielectric Resonator Antenna (CDRA) with a flat reflector is designed and presented. The measured bandwidth of the antenna is about 1.8 % (5.32 – 5.52) while the simulated bandwidth is 1.11% (5.32 – 5.44 GHz). A comprehensive parametric study has been conducted to realize the effects of slot size, slot position and reflector parameters to...
The concept of Substrate integrated waveguide (SIW) has emerged to be a good replacement of rectangular waveguides in low-cost and high-volume microwave and millimeter wave band applications. A number of bandpass filters have been developed since the advent of the SIW technology. However, its various forms have also been introduced in order to bring about further reduction in the footprint of these...
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