Mohd Fais Mansor

Universiti Kebangsaan Malaysia | ukm · Department of Electrical, Electronic and Systems Engineering

roducing compact devices for space technology. Transparent antennas are seen as the solution to this problem. With the presence of a transparent antenna, it can save antenna installation space as its transparency properties allow it to be integrated with solar technology. However, the use of transparent material on the antenna causes the antenna ga...

This article proposed ultra-thin square ring-shaped metamaterial absorber nano-architectures for optical and near-infrared regime (NIR). The absorber structure comprises three layers of nickel-polyimide-nickel (Ni–Pi–Ni) material and accomplishes better absorption performance. It shows an absorption rate of 99% across a large bandwidth ranging from...

This paper presents a reconfigurable reflectarray unit cell design that incorporates Barium Strontium Titanate (BST) technology for satellite applications. The design proposes three concentric square rings, two of which are divided by a gap and equipped with phased delay lines. This configuration aims to achieve a broader phase range and lower refl...

A complementary ring resonator (CRR) technique is used to improve the bandwidth of the dielectric resonator antenna (DRA) while maintaining other parameters such as the efficiency and the gain. Parametric experiments were conducted in order to demonstrate the suggested antenna's working guideline. The bandwidth of the proposed Antenna is boosted by...

In this article, a simple metamaterial absorber (MMA) is presented aiming absorption of microwave signals from Wi-Fi frequencies of 2.4 GHz, and 5 GHz. The MMA unit cell constructed on 20 × 20 mm² FR4 substrate provides maximum absorption of 99.2% and 99.9% at 2.4 GHz and 5 GHz with the flexibility of on-design tuning of maximum absorption frequenc...

Nowadays, electronic products are being used extensively in many fields and applications. The dense population of electronic devices in human life has become a challenge for microwave engineers to ensure that their products can meet the Electromagnetic Compatibility (EMC) standards. Complex electronic products with smaller sizes and denser componen...

Polarization insensitive metamaterial absorbers (MA) are currently very attractive due to their unique absorption properties at different polarization angles. As a result, this type of absorber is widely used in sensing, imaging, energy harvesting, etc. This paper presents the design and characterization of a dual-band polarization-insensitive meta...

This paper investigates the effect of index finger position and distance on the radiated power of 4-element MIMO antenna, operating at 28 GHz. The antenna elements (AEs) are located at the top corner of the user terminal and separated at a distance of half a wavelength. Four different finger placements were investigated, one placement over each AE...

This paper presents an ultralow profile, low passive intermodulation (PIM), and super-wideband in-building ceiling mount antenna that covers both the cellular and public safety ultra high frequency (UHF) band for distributed antenna system (DAS) applications. The proposed antenna design utilizes a modified 2-D planar discone design concept that is...

This paper presents results of maximal ratio combining (MRC) technique of dual-band 4-element MIMO antenna with user's hand in data mode and different placements of antenna elements (AEs) on the chassis. The different placements start from worst case to optimal which is selected to avoid thick tissues of the hand. The dual 5G frequency bands are fr...

This paper investigates the performance variation when a different number of antenna elements (AEs) is integrated onto a single MIMO mobile terminal, both in free space and when held in a user hand in data mode. Starting with a minimum of two AEs, this investigation assessed the performance of the MIMO terminal with every additional two AEs (up to...

An ultralow profile, dual-wideband and low passive intermodulation (PIM) in-building ceiling-mount antenna for long term evolution (LTE) distributed antenna system (DAS) application is presented. The proposed antenna was designed based on asymmetrical dipole concept having a ground plane with an inclined feeding edge to achieve wideband characteris...

p>A transparent grid array antenna of 28 GHz frequency is presented. The radiating element of the antenna is made of ITO thin film and printed on a glass as the dielectric substrate. The simulation of the antenna executed by using Computer Simulation Technology (CST) Microwave Studio software demonstrated at 28 GHz operating frequency for 5G band a...

Wireless sensor network is consisting of power-limited sensors that sense the surrounding environment and transmit data to another sensor or to the particular gateway. Thus, a considerable amount of energy is dissipated which impact the overall performance and network lifetime. In order to mitigate the failure-based energy, routing and clustering m...

The large network architecture of today consists of thousands of computers connected together through many interconnecting router and switches. As many of them communicate concurrently, congestion over the channels may increase. In order to maintain the fairness among the transmission control protocol (TCP) based packets being sent, during congesti...

A digit 8-shaped resonator inspired metamaterial is proposed herein for sensor applications. The resonator is surrounded by a ground frame and excited by a microstrip feedline. The measurement of the sensor can be performed using common laboratory facilities in lieu of using the waveguide, as the resonator, ground frame, and feedline are all on the...

A simple solar cell integrated with a triangular loop shape element of reflects array antenna is presented in this paper. The triangular loop shape element is varied in size to get the required phase range and bandwidth. A wide bandwidth range over 15% has been achieved. Furthermore, a 3 × 3 element reflect array is then formed with 20° scattering...

The large network architecture of today consists of thousands of computers connected together through many interconnecting router and switches. As many of them communicate concurrently, congestion over the channels may increase. In order to maintain the fairness among the transmission control protocol (TCP) based packets being sent, during congesti...

A new modified hexagonal design structure with broadband‐negative refractive index metamaterial was proposed in this manuscript. The proposed structure was composed of two symmetrical metallic layers which had same thickness and an FR4 dielectric layer that was sandwiched between these metallic layers. Frequency domain solver of CST microwave studi...

In this paper, we introduce a new compact left-handed tunable metamaterial structure, inspired by a joint T-D shape geometry on a flexible NiAl2O4 substrate. The designed metamaterial exhibits an extra-large negative refractive index bandwidth of 6.34 GHz, with an operating frequency range from 4 to 18 GHz. We demonstrate the effects of substrate m...

An initial cuboid shape dielectric resonator antenna is made from a ceramic compound with a high dielectric constant of 30. A feeding mechanism that consists of a coaxial probe in the middle of the antenna is installed underneath, Parasitic feed elements are used to guide the flow of the surface current into the desired direction. Each parasitic fe...

This study examines a cuboid dielectric resonator antenna with partial ground plane. The dielectric resonator of the antenna is designed with high permittivity, ɛr=30. The dimension used to design this cuboid dielectric resonator antenna was based on the dielectric waveguide model (DWM). Meanwhile, the feeding structure depends on the microstrip fe...

A low profile solar cell integrated with reflectarray element composed of multilayer materials is presented in this study. A unit cell consist of triangular loop shape element is varied in size to get the required phase range. Some modification is then introduced to the triangular loop element aimed to optimize the bandwidth. A wide bandwidth range...

A Cuboid Dielectric Resonator Antenna fed by microstrip feed line is studied. The dielectric resonator of the antenna is made by a material with high dielectric constant ϵr=30. The impedance matching of dielectric resonator can be improved by using a # slot in the ground. In additional, a two elements array is used to enhance the performance of the...

This paper presents the analysis of 28GHz solar patch antenna using the variations of transparent conductive oxides (TCO) thin film as the radiating patch. Solar antenna is basically combining the function of antenna and solar cell into one device and helps to maximize the usage of surface area. The main problem of the existing solar antenna is the...

In this manuscript, double-negative transmission line (TL) metamaterial-inspired antenna has been proposed with compactness and improved bandwidth. This antenna is made of double-negative meander lines, microstrip feed and partial ground. Double-negative TL metamaterials show negative permittivity and permeability simultaneously and play important...

Time management is an important skill that every student in higher education institutions should acquire since it is one of the key factors in assuring excellent achievement in academic. Students with poor time-management skills are far more likely to be tressed and, as a result, have a negative impact on the quality of life. Thus, this paper discu...

This paper presents the performance of bandwidth from a triangular loop shape radiating element stacked on a glass with variation of dielectric permittivity values. In this study, the dielectric permittivity value of the glass was varied from 1.5 to 10. A Kapton film (radiating element) was positioned on top of the glass and grounded with a copper...

In this paper, a paper based negative indexed metamaterial is proposed for electromagnetic absorption reduction of portable wireless devices. The metamaterial structure has been designed and characterized using FIT technique based EM simulator CST Microwave studio. The main outcomes of the paper are EM absorption reduction by 14.23% and 15.3% at 0....

This paper presents an aperture-coupled microstrip antenna, which is operating at dual band of millimeter-wave (mmW) frequencies, 28GHz and 38GHz. The aperture antenna was integrated with multilayer substrate construct on 5-layers Low temperature Co-fiber Ceramic (LTCC) with 5 mils thickness. The driven patch was applied to enhance the bandwidth. T...

An analysis on element shape geometry is presented in this paper to enhance the reflectarray element bandwidth, to produce a more reliable phase distribution over the reflectarray antenna aperture and to have a good reflection element performance. The shape analysis consists of circular patch element, circular ring element and circular square ring...

In this paper, a design concept of modified rectangular shape slotted patch antenna with microstrip feed is proposed for GPS and WLAN applications. The proposed simple planar design of the planar antenna is composed of partially extended radiating surface which is loaded with L-shape slot and two wide square slots. The optimized design of the anten...

A printed microstrip line-fed patch antenna for C-band applications is presented, using a high-dielectric material. The proposed antenna dimensions are 0.53 × 0.53 × 0.02 and it is fed by a microstrip line. The antenna outline and electromagnetic analysis were done with the help of a commercially available computer-aided EM simulator. This antenna...

A novel compact microstrip patch circularly polarised antenna for mobile wireless application is presented in this paper. The proposed antenna is incorporated with quadrilateral shape radiator, inverted S-shape partial ground plane and 50microstrip feed line. A wide impedance bandwidth of 109.13% (1.69-5.75 GHz with measured 3 dB axial ratio (AR) b...

The utilization of varactor diode is advantageous as it offers the beam scanning capability as required for reflectarray antenna but it often said as the contributor to high losses. A superposition of reflectarray elements controlled by varactor diode is evaluated with dynamic phase range enhanced and loss improved at Ku-band for a successful desig...

The design of reconfigurable reflectarray with a single varactor to provide capacitance effect embedded inter-patch are presented. The essence of this concept lies in the behavior of the capacitance variation contributes to phase changes of element. Simulated radiation patterns with single element phase characteristics as a reference are reported t...

This study aims to design a new cuboid dielectric resonator antenna (DRA) for LTE Femtocell base stations. The dielectric waveguide model (DWM) was used to carry out the dimension of cuboid dielectric resonator antenna. The dielectric cuboid is based on a high dielectric constant ceramic material, which is e=30. The feeding structure is dependent o...

Design tri-band rectangular patch antenna is presented. This research study focuses on designing an antenna that can operate with three bands; 2.4, 3.5 and 4.4 GHz, respectively. These bands are accepted by Wi-Fi, Wi-MAX and WLAN in Military band applications. The shape of the proposed design is based on simple rectangular patches with inset-feed o...

The new antenna design of a multiband rectangular shape dielectric resonator antenna (DRA) which operates at around 1.8GHz (GSM1800), 2.2GHz (DVB-SH) and 2.6GHz (LTE-A) bands for wireless mobile communication handheld devices is discussed in this paper. The proposed DRA is designed with a size of 34mm × 33mm × 10mm and simulated by using the CST Mi...

A circular polarized highly directional S band patch antenna for small satellite applications has been proposed in this invention. The proposed antenna comprises of a square ground plane and two circular radiating patches with annular circular slot fed by a coaxial probe. The circular slot in the radiating patch is responsible for creating resonanc...

A miniaturized antenna employing a negative index metamaterial with modified split-ring resonator (SRR) and capacitance-loaded strip (CLS) unit cells is presented for Ultra wideband (UWB) microwave imaging applications. Four left-handed (LH) metamaterial (MTM) unit cells are located along one axis of the antenna as the radiating element. Each left-...

This paper presents a compact MIMO antenna for LTE 700, LTE 2300 and LTE 2500 applications. The antenna is configured by two symmetrical quarter wavelength meandered lines on the front side and a slotted ground plane at the back side. An decoupling patch is used to achieve good isolation between two symmetrical quarter wavelength meandered lines.

An analysis of dual frequency operation of concentric split ring square element for reflectarray antenna is presented in this paper. The antenna diameter is designed at 150 mm × 150 mm size to understand its characteristic performance in term of gain, sidelobe level (SLL) and beamwidth. The variable size approach is used to form a planar phase fron...

This paper presents the performance of scattering parameters from different types of transparent conductive thin film. In this study, four types of optically conductive thin film i.e. AgHT-4, AgHT-8, ITO, and Kapton film have been investigated. Each film was designed with triangular loop shape and positioned on top of cover glass of solar panel and...

An analysis of phase response from different types of transparent conductive thin film is presented in this paper. Surface current performance of each film which was shaped with triangular loop shape is then investigated. It has been demonstrated from the CST simulated results that element of Kapton film exhibits the best scattering parameter perfo...

This paper proposes a small sized, low-cost multiband monopole antenna which can cover the WiMAX bands and C-band. The proposed antenna of 20 × 20 mm 2 radiating patch is printed on cost effective 1.6 mm thick fiberglass polymer resin dielectric material substrate and fed by 4 mm long microstrip line. The finite element method based, full wave elec...

This paper presents an analysis of reflectarray antenna in simple patch design unit cell with the effect of varactor diode integrated. The small shift of resonant frequency with capacitance varying results in changes of reflected phase of operating frequency. The reflected phase adjustable of element is required for reconfigurable reflectarray desi...

The design procedure and physical module of a compact wideband patch antenna for Ku band application are presented in this paper. Finite element method based on 3D electromagnetic field solver has been utilized for the designing and analyzing process of proposed microstrip line fed modified E - H shaped electrically small patch antenna. After su...

A mircostrip antenna is designed for multielement antenna coverage optimization in femtocell network. Interference is the foremost concern for the cellular operator in vast commercial deployments of femtocell. Many techniques in physical, data link and network-layer are analysed and developed to settle down the interference issues. A multielement t...

A result of concentric ring square element for reflectarray antenna is presented in this paper. An analysis of frequency response is described and analyzed. The physical interpretation of the elements is also discussed. The proposed antenna element effectively covers two frequencies operations. Bandwidth broadening is achieved by introducing the sq...

A reflectarray element controlled by varactor diode is evaluated in improving dynamic phase range and loss performance at Ku-band that will form a fundamental approach for a successful design of an antenna element in the array environments. The use of varactor diode is quite advantageous as its offers the beam scanning capability as required for re...

This paper presents an investigation of scattering phase of reflectarray element in double split ring shape integrated with varactor diode across the gap for feasibility of reflectarray antenna in beam scanning approach. The paper contributes simple design with single substrate and single varactor diode at Ku-band for space communication. The refle...

This paper describes a study of radiation pattern diversity with reference to the polarization by combining ring patch with C-patch reflectarray antenna element. For monopulse antenna application, patches were designed to give the reflection phase of 180° phase difference between two orthogonal polarizations. The simple geometric design of a ring a...

An outdoor measurement campaign was undertaken with a dual circularly polarized (CP) contrawound quadrifilar helix antenna (CQHA) at the receiver terminal in a low-elevation land mobile satellite multiple-input-multiple-output (MIMO) system. The CQHA is a combination of two colocated miniaturized quadrifilar helix antennas and feeding networks. Per...

A dual circularly polarised contrawound quadrifilar helix antenna (CQHA) is proposed for land mobile satellite MIMO systems. The CQHA is combination of two QHAs with opposite winding rotation where one is positioned inside of the other. Low return loss and isolation of the CQHA elements is achieved by varying the radius of the outer QHA while the i...

Analysis of the mutual coupling and its effect on the CQHA performance in LMS MIMO system are investigated and presented in this paper. Due to the complexity of the CQHA structure, the mutual coupling effects were mainly studied using electromagnetic simulation. The effect of the separation spacing between inner and outer QHA on the mutual coupling...

The purpose of feature extraction technique in image processing is to represent the image in its compact and unique form of single values or matrix vector. Low level feature extraction involves automatic extraction of features from an image without doing any processing method. In this paper, we consider the use of high level feature extraction tech...

This paper attempts to briefly and adequately explains Notional Credit and Notional Credit Hour. The importance of both items in designing course delivery and loading is presented and an intuitive calculation explaining both were also discussed and presented. An MS-Excell based system that automates and simplifies course delivery and loading design...