Ali Othman

Ali Othman
Universiti Teknologi MARA | UiTM · Faculty of Electrical Engineering

Doctor of Engineering

About

18
Publications
7,540
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91
Citations
Citations since 2016
0 Research Items
26 Citations
201620172018201920202021202202468
201620172018201920202021202202468
201620172018201920202021202202468
201620172018201920202021202202468

Publications

Publications (18)
Conference Paper
Full-text available
The feasibility design and development methods of silicon microfabricated beam expander are described. Silicon bulk micromachining fabrication technology is used in producing features of the structure. A high-precision complex 3-D shape of the expander can be formed by exploiting the predictable anisotropic wet etching characteristics of single-cry...
Conference Paper
Fault in the transmission line network initiates a number of unpredictable parameters. These parameters influence the Least Square Algorithm (LSA) implemented in digital protective relays for estimating fundamental frequency phasor. The sensitivity analysis method is applied for analyzing the degree of influential parameters since the investigated...
Article
This article presents the design, simulation, and fabrication of hybrid dielectric resonator integrated pyramidal horn antenna (HDRIPHA) operating from frequency range of 10–18 GHz to cover most of the existing Ku-band microwave frequencies. The designed HDRIPHA is analyzed and optimized using power modeling software CST Microwave Studio ®. The des...
Conference Paper
This paper presents the design and simulation of hybrid rectangular printed strip monopole dielectric resonator antenna (HRPSMDRA) for ultra wideband communication systems. The designed HRPSMDRA is analyzed and optimized using power modeling software CST Microwave Studio ®. The designed HRPSMDRA assembly consists of hybridizing an annular hexagon d...
Article
A parasitic cylindrical dielectric resonator excited horn antenna at 38GHz is proposed. This horn antenna is fed by five identical cylindrical parasitic dielectric resonators through a coupling rectangular slot of 50 ohms microstrip feedline. It is designed to parasitic type for high gain and isolation characteristics. Simulated result shows antenn...
Article
This paper presents a new approach of designing a bandpass filter by applying a combination of microstrip and cylindrical dielectric resonators for X-Band application. Three dielectric resonators with a same permittivity and diameter of 60 and 5 mm respectively are applied in the circuit in order to obtain a wideband of more than 1.0 GHz. The combi...
Article
This paper focuses on the analysis to find suitable locations to place dielectric resonators on microstrip transmission line in order to obtain a high coupling effect. A novel design of an X-Band bandpass filter from a combination of a simple transmission line and three cylindrical dielectric resonators are used in this analysis. The three dielectr...
Article
This paper presents a new approach of designing a bandpass filter by applying a combination of microstrip and cylindrical shape of dielectric resonators for X-Band application. Three dielectric resonators with a same permittivity and diameter of 60 and 5 mm respectively are applied in the circuit in order to obtain a wideband of more than 1.0 GHz....
Article
This paper proposes a new generation of antenna that applies metamaterial as a base construction. The current bulky size of antennas can easily be replaced by the newly invented metamaterial. Design methodologies including the matamaterial and patch antenna have been explained in detail. The simulation results show that an antenna with a metamateri...
Conference Paper
Full-text available
A pyramidal horn antenna excited with parasitic dielectric resonator (DR) antenna for use at Ka-band frequencies is proposed. This antenna been divided into two parts, microstrip-fed rectangular slot DR antenna and a pyramidal horn. DR antenna consists of five identical cylindrical parasitic DR fed by a microstrip feedline through a coupling rectan...
Conference Paper
Full-text available
A practical horn antenna feeding configuration for use at Ka-band frequencies is proposed. It is consists of five circular identical cylindrical parasitic dielectric resonator (DR) fed by a microstrip feedline through a coupling rectangular slot in the ground plane between them. It is designed to parasitic type for high gain, high isolation and wid...
Conference Paper
A parasitic cylindrical dielectric resonator excited horn antenna at 38GHz is proposed. This horn antenna is fed by five identical cylindrical parasitic dielectric resonators through a coupling rectangular slot of 50 ohms microstrip feedline. It is designed to parasitic type for high gain and isolation characteristics. Simulated result shows antenn...
Article
Full-text available
In this paper, a novel nine elements array dielectric resonator antenna (DRA) is presented. The DRA was excited by a microstrip feeder with a rectangular aperture coupled slots. The slot positions were determined based on the characteristic of standing wave ratio over a short ended microstrip. The measured gain of the array DRA operating at 5.84 GH...
Conference Paper
Full-text available
This paper described the design, simulation and fabrication of a parallel-coupled band pass filter. The design was for K-band applications with bandwidth of 300 MHz. The filter was operated between 21 to 21.3 GHz. The circuit was designed and simulated using Genesys and the measurement was carried out after fabrication on RT Duroid 5870 with 0.508...
Conference Paper
Full-text available
This paper presents Chebyshev three and four poles microstrip hairpin filter for radar applications. The filters are operated at K-band frequency segment of 20-20.3 GHz. The filters were designed using Genesys software and implemented on Roger 5870 substrate. The results from simulation and measurement show that both filters were operating at the d...
Conference Paper
Full-text available
In this paper, dielectric resonator antenna operated at 3.5 GHz was design and simulated using CST Microwave Studio and subsequently fabricated. Direct microstrip line of 50 Omega was used as the feeder. In this design, rectangular shape was used as the dielectric resonator as it offers more option to control the resonant frequency. The position of...
Conference Paper
Full-text available
In this paper, small dielectric resonator antenna was design and developed by using high permittivity dielectric material of 55. The dimensions of the dielectric resonator were 5.4 mm (width), 9.3 mm (length), and 3.14 mm (height). This DRA operate at a frequency around 5 GHz. It was excited with microstrip line where the position of the DR on the...
Conference Paper
Full-text available
A microwave resonator has been designed with the aid of GENESYS software and the circuit was fabricated on Roger microstrip with dielectric constant of 3.48. A combination of two congruent coupled line sections was used to resonate at 1.8 GHz. The discrepancies between measure and simulated result of half-power bandwidth was due to the size of the...

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