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This paper presents a reconfigurable beam direction folded dipole antenna with Artificial Magnetic Conductor (AMC). A coaxial probe placed in the middle of the proposed antenna as the medium to feed the current and then distributed to the radiating element. This research has the capability to steer the beam direction by implementing the radio frequency (RF) switch mechanism on the antenna. With a...
This paper presents an analysis of Dominant Path Model on perpendicular and angular transmitter that was operated at 5.8GHz. The simulation uses win Prop software and the measurement was done at UniCITI Alam campus, Perlis. Comparison of the path loss and signal strength was done when different transmitter position and different receiver height were considered. Angular transmitter positioning shows...
This paper presents an analysis of Dominant Path Model for different angles of transmitter position that was operated at 5.8GHz. The environment of UniCITI Alam Campus of Universiti Malaysia Perlis (UniMAP) was modeled in the simulation software. Different angles of the transmitter are st to 0degree, 5degree, 10degree and 20degree down tilt in reference to the ground were considered and compared to...
Inverter air-conditioning system equip with adjustable-speed outdoor fan as additional input control to maximize efficiency and energy saving. The adjustable-speed outdoor fan implements Brushless DC motor (BLDC) with sinusoidal drive. However, the BLDC motor is high voltage rated to efficiently operate with sinusoidal drive can cause to high switching losses. To enhance the efficiency and energy...
The identification of faults in voltage source inverter is highly required to ensure the reliability of the inverter. Early detection of the faults can greatly assist in maintenance of the system by avoiding possibly harmful damage borne out. This paper presents the analysis of short-circuit switches fault of voltage source inverter (VSI) using time frequency distribution (TFD). The TFD which is spectrogram...
Since Grover’s seminal work which provides a way to speed up combinatorial search, quantum search has been studied in great detail. We propose a new method for designing quantum search algorithms for finding a marked element in the state space of a graph. The algorithm is based on a local adiabatic evolution of the Hamiltonian associated with the graph. The main new idea is to apply some techniques...
This paper proposes the application of Differential Evolution (DE) algorithm to the selective harmonics elimination pulse-width modulation (SHE-PWM) scheme. The aim is to solve for the set of transcendental equations that determine the switching angles of the SHE-PWM waveform. The objective function of DE is designed to minimize the selected harmonics to near zero. Furthermore the fundamental component...
This paper presents an efficient Differential Evolution (DE) based solution for harmonic elimination pulse-width modulation (HEPWM). The aim is to solve for the set of transcendental equations that determine the switching angles of the HEPWM waveform. The objective function of the DE is designed to minimize (to near zero) the selected harmonics and at the same time allows for the fundamental component...
The pH-sensing properties of tantalum pentoxide (Ta2O5) film deposited by RF magnetron reactive sputtering method is demonstrated. The tantalum pentoxide film on silicon wafer samples were characterized by capacitance-voltage (C-V) measurements. The samples were annealed in ambient condition at 400°C for several hours. High frequency C-V measurements were performed on the wafer samples at pH levels...
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