Papers by DR. MOHD AZIZ ARIS
2019 International Symposium on Antennas and Propagation (ISAP), 2019
A new antenna structure with low mutual coupling between 2 antenna elements for MIMO has been dev... more A new antenna structure with low mutual coupling between 2 antenna elements for MIMO has been developed and presented in this paper. The decoupling structure has been analyzed and designed between both antennas to suppress the isolation between dual elements. Nine different structures has been designed and 28.75% improvement on isolation has been achieved from pattern 3 decoupling structure. By using the decoupling structure, the antenna bandwidth has been improved tremendously to 20.8%. The antenna has been printed with full copper ground on the bottom layer. The antenna was simulated and optimized at 16 GHz using Computer Simulation Technology (CST) with permittivity, r = 2.2 and thickness, h = 1.57mm on Rodges RT-Duroid 5885 substrate. The antennas are matched at their corresponding frequency of operations. The simulation and fabrication results have shown that the antenna works well.
Journal of Electrical & Electronic Systems Research, 2020
The research proposal will be focusing on the benefit for Mobile Network Operators (MNOs) in the ... more The research proposal will be focusing on the benefit for Mobile Network Operators (MNOs) in the backhaul connectivity. In normal situation, each of Base Transceiver Station (BTS) will need to carry their backhaul using any Transmission link either Microwave, Fiber or VSAT to be connected to the Core Network to establish a complete cycle of connectivity in Mobile Network. This backhaul will carry an individual link of each BTS (end site) site that is depends on number of hub before it reach to the Core Network. By introducing the Backhaul Grooming using BTS Hotel Concept will benefit MNOs in cost reduction on numbers of hub/link towards reaching the Core Network. Besides, the solution is economical where the BTS site footprint and Power Consumption will be reduced. The solution will be using the DWDM concept via Fiber optics network where multiple BTS sites will be connected and groom in One location so called BTS Hotel. In this BTS Hotel, the Baseband Unit (BBU) of NodeB/eNodeB will be placed in rack while the Remote Radio Unit (RRU) will remain at End site/station. The connection between BBU and RRUs is called Fronthaul and the connection will be grooming using Dense Wavelength Division Multiplexing (DWDM) connectivity.Using this solution, multiple End Sites will be connected to one single point called BTS Hotel and from this Hotel/room the Backhaul connection to the Core Network or Evolved Packet Core (of each Telco) will be only ONE Single connection instead off multiple link-up from each End site where this solution is very economical as compared to conventional method that currently practice in the industry. The fronthaul connectivity is monitored by the MNOs monitoring center as the RRUs and BBU monitored via NMS (Network Monitoring System) while the backhaul connectivity and utilization will be then monitored via the backhaul usage and can be upgraded accordingly when there is a need subject to site utilization.
International Journal of Electrical and Computer Engineering (IJECE), 2020
We present a new development of microstrip antenna structure combining a simple circular structur... more We present a new development of microstrip antenna structure combining a simple circular structure with a ring antenna structure as the parasitic element to improve the antenna gain and bandwidth for 5G mobile application. The proposed antenna was fed by a 50Ω microstrip feeding line due to its advantages in performance. The antenna was designed and simulated using a single substrate with double layered copper (top and bottom) with the radiating patch on the top layer and full ground on the bottom layer of the same substrate. Three antennas have been designed namely; design1, design2 and design3 to complete the research works.The antennas ware simulated and optimized at 18 GHz using Computer Simulation Technology (CST) with permittivity, r = 2.2 and thickness, h = 1.57mm on low-loss material Roger RT-Duroid 5880 substrate. The antennas ware reasonably well matched at their corresponding frequency of operations. The simulation and measurement results have shown that the antenna work...
International Journal of Integrated Engineering, 2020
This paper is presenting preliminary research to design Isolated Magnetic Dipole MIMO Antenna for... more This paper is presenting preliminary research to design Isolated Magnetic Dipole MIMO Antenna for wireless application. Isolated Magnetic Dipole (IMD) structure is one of the unique geometries that offers compact and low damaging electrical current at the ground surface. However, less attention in discussing design the MIMO antenna using IMD structure. The two elements MIMO antenna using IMD with linear port configuration has constructed at 2.4 GHz. Then simulated and analyzed to validate the feasibility of the IMD-MIMO antenna. The simulation and analysis cover S-Parameters, radiation, Gain, Correlation coefficient, and diversity gain. In addition, simple Semi-circle structure etched on the ground layer to improve the isolation of MIMO antenna. From the simulation results, the IMD-MIMO antenna has better results and highly recommended for designing compact MIMO antenna.
2021 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE)
International Journal of Electrical and Computer Engineering (IJECE)
This study investigated the microwave characterization of a potential organic-based substrate pan... more This study investigated the microwave characterization of a potential organic-based substrate pandanus atrocarpus. Pandanus atrocarpus, also known as "pandan mengkuang", is easily found at riverside and beach areas in Penisular Malaysia. The experiment's objective was to measure dielectric constant and tangent loss using the dielectric coaxial probe method by employing vector network analyzer (VNA) and dielectric probe. Dielectric constant and tangent loss are the crucial parameter in the microwave design. Three different samples of pandanus atrocarpus were measured and analyzed. The result showed that the dielectric constant of the pandanus substrate material depended on the leaves' water content. All experimental results obtained were analyzed, presented, and discussed in this paper.
Electronics, 2021
In the 5G system, multiple-input multiple-output (MIMO) antennas for both transmitting and receiv... more In the 5G system, multiple-input multiple-output (MIMO) antennas for both transmitting and receiving ends are required. However, the design of MIMO antennas at the 5G upper band is challenging due to the mutual coupling issues. Many techniques have been proposed to improve antenna isolation; however, some of the designs have impacts on the antenna performance, especially on the gain and bandwidth reduction, or an increase in the overall size. Thus, a design with a detailed trade-off study must be implemented. This article proposes a new C-shaped parasitic structure around a main circular radiating patch of a MIMO antenna at 16 GHz with enhanced isolation features. The proposed antenna comprises two elements with a separation of 0.32λ edge to edge between radiation parts placed in a linear configuration with an overall dimension of 15 mm × 26 mm. The C-shaped parasitic element was introduced around the main radiating antenna for better isolation. Based on the measurement results, the...
International Journal of Electrical & Electronic Systems Research (IEESR), 2019
This paper proposes frequency reconfigurable antenna for outdoor wireless communication systems, ... more This paper proposes frequency reconfigurable antenna for outdoor wireless communication systems, the 4 x 4 array antenna has designed at two resonant frequencies 7.5 GHz and 8.85 GHz. The periodic dumbbell geometry etched on the ground layer newly proposed with dual functionality, to control desired frequency and to couple radiating patches at the top substrate with feeding line at the bottom substrate. The reconfigurability of the patch antenna is controlled by utilizing the copper pad of the feeding network with OPEN and SHORT states. The reconfigurable antenna has been simulated and optimized using Computer Simulation Technology (CST) to get the desired responds. The good agreement between simulation and measured results indicates that the frequency reconfigurable patch array antenna using Periodic Dumbbell Slotted Aperture Structure (FRPDSA) is feasible to support outdoor wireless communication systems.
World Applied Sciences Journal
This paper presents a design of single element rectangular microstrip antenna, where it can be em... more This paper presents a design of single element rectangular microstrip antenna, where it can be embedded on an aluminium tin can for radio frequency (RF) application. The microstrip antenna was designed using a Liquid Crystalline Polymer (LCP) substrate with dielectric constant, = 2.9 and aluminium patch with electrical conductivity, r = 3.72 × 10 S/m. The microstrip antenna was originally designed using Computer Simulation Technology (CST) 7 Microwave Studio software for operation at 2.45 GHz frequency band application. Furthermore, the return loss, S 11 parameter of microstrip antenna is investigated. Some optimizations and analyses are performed such as varying the patch length and width with fixed dielectric constant. In addition, the related simulated value of impedance and return loss are examined and compared.
2004 RF and Microwave Conference (IEEE Cat. No.04EX924)
Abstract Nondestructive, noncontact and real time evaluation of dielectric properties of low-loss... more Abstract Nondestructive, noncontact and real time evaluation of dielectric properties of low-loss liquids is important for applications such as service-aged transformer oil, biomedical, remote sensing and design of radar absorbing material. Free-space methods (which are ...
2009 Asia Pacific Microwave Conference, 2009
... Mohd Aziz Bin Aris#1, Ermeey Abd Kadir#1, Deepak Kumar Ghodgaonkar#2, and Norasimah Khadri#2 ... more ... Mohd Aziz Bin Aris#1, Ermeey Abd Kadir#1, Deepak Kumar Ghodgaonkar#2, and Norasimah Khadri#2 1Faculty of Electrical Engineering Universiti Teknologi MARA ... ABCD parameters of the Plexiglas container are related to measure S-parameters by following equations [1]. ...
2010 2nd International Congress on Engineering Education, 2010
ABSTRACT This paper describes a structured management on the implementation of a new syllabus of ... more ABSTRACT This paper describes a structured management on the implementation of a new syllabus of Final Year Project 2 (FYP 2) with new code: EEE368 for the diploma program of Electrical Engineering in Universiti Teknologi MARA (UiTM) Terengganu. The objectives of developing this approach is to ensure the program is well organized and comprehensive, the accuracy of evaluation scheme is observed, fairness is guaranteed, the listed program outcomes are achieved as well as capable to enhance the students' soft skills. It starts with the assignment of a coordinator and establishing related committees. A schedule which includes all the important deadlines is prepared by the coordinator and distributed to the supervisors as well as students. All regulations are announced to the students during the first meeting and the guidelines are circulated among the supervisors. Workshops for technical writing and presentation skills are held to expose the students to the proper writing and presentation skills. Logbooks are written by students based on the format given and should be approved by their supervisors and will finally be audited by the coordinator monthly to observe their progress. This approach is expected to be beneficial for the management of FYP 2 in terms of organization which consequently leads to the betterment of the students.
2010 2nd International Congress on Engineering Education, 2010
The assessment of the Final Year Project 2 (FYP2) is very subjective if no proper guidelines are ... more The assessment of the Final Year Project 2 (FYP2) is very subjective if no proper guidelines are given especially if the marks are evaluated by more than a person. A fair assessment of FYP2 is therefore crucial to be considered and this paper presented a precise of assessments from supervisor and panel for implementation of a new code EEE368 for Diploma Electrical Engineering Universiti Teknologi MARA (UiTM). The major shortcoming of the former code, KEU380 is that the marks for the final project or prototype were not fairly allocated. Only 10% is allocated for supervisor's evaluation and the students' efforts in accomplishing the final product were not measured. Even though the project is assigned in groups, teamwork was not assessed. Allocation of marks for EEE368 is based on the confidential syllabus from Faculty of Electrical Engineering (FKE) UiTM which are 40% from panel and 60% from supervisor. Hence, the FYP2 committees distributed the marks for a new syllabus as following criteria; for panel evaluations: Presentation Skills and Project Demonstration are 15% and 25% respectively, and for supervisor evaluations: 30% for Writing Skills and 10% for each criteria of Progress Work (Logbooks and meeting with supervisor), Teamwork and Project Demonstration. The benchmark for marks is categorized to poor, moderate, good and excellent and the details are discussed in this paper.
Predisposition to implement multifunction concept in modern wireless communication systems is one... more Predisposition to implement multifunction concept in modern wireless communication systems is one of the main reason why Reconfigurable Microstrip Antenna has received extreme attention from engineers and antenna designers, particularly Compound Reconfigurable Microstrip Antennas (CRMA) that capable to control more antenna parameters into single antenna structure. The versatility of the antenna in terms of functionality, is more significant to support multidisciplinary wireless communication systems. However, formal structure of CRMA using contacting feeding line, stacked patch and limited utilization of array element to control radiation beam contributes to performance degradation and increase high volume of patch antenna. According to these issues, this research is conducted to embark on investigating a new structure of CRMA. The antenna has been simulated and fabricated, and further CRMA has constructed with biasing line to control frequency and radiation angle using PIN diodes t...
ABSTRACT This paper presents the findings of industrial survey conducted by the Faculty of Electr... more ABSTRACT This paper presents the findings of industrial survey conducted by the Faculty of Electrical Engineering, UiTM (Terengganu) to assess the new diploma program in industrial engineering. The goal of this survey is to explore how adequately the new program meets the training needs of the next generation of electrical engineers so as to fulfill the industry requirement. The surveys questionnaires have been designed to address the strong components of the new program such as industry related engineering topics, hands on experience and industrial training. The result of the survey indicates that the industry perceived the new program to be beneficial to graduates and labour market. Introduction Today " s engineering professions have been continuously experiencing major changes in knowledge, equipment, tools, systems, and managements. Most companies demand engineering graduates with a strong theoretical background and require them to be equipped with employability skills. Future role of engineers in society become more challenging as the globalization in industry and engineering practices [1]. Much complains has been heard about graduate unemployment and one of the factor is graduates are not ready to enter workforce. Many graduates have insufficient grasp of fundamental theory, inadequate knowledge of the latest technology and the skills they posses mismatch the industry need. The engineering education system should be broad-based engineering programs to adapt to the changing technologies and environment [1]. The effort to align university-industry needs is very important, so that students could match their competencies with what the industry expects. Therefore, a more dynamic curriculum for the engineering education is required. Recent industry surveys from a group of researcher in Malaysia shows that there exists some significant gap between skills actually possessed by employee and the skill thought to be important by employer [2]. A study among local graduates and employees around July 2007 in [3] found that, the employability skills are extremely considered important by both the graduates and the employees.
Uploads
Papers by DR. MOHD AZIZ ARIS