M. Junaid Mughal

M. Junaid Mughal
COMSATS University Islamabad | CUI · Department of Electrical Engineering

PhD

About

133
Publications
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Citations

Publications

Publications (133)
Article
In this paper, we have theoretically examined Goos–Hänchen shift (GHS) obtained from a stratified epsilon-near-zero (ENZ) medium placed in air. Transfer matrix method is used to calculate GHS for a sandwich structure composed of odd number of slabs. The impact of changing the material permittivity, thickness and number of slabs on GHS is discussed...
Article
Full-text available
This paper reports a multiband Yagi-Uda shaped metamaterial absorber (YUMA) operating in X-and Ku-band of the microwave regime with the added functionalities of miniaturization, polarization controllability and wide incidence angle stability. The proposed YUMA shows three distinctive near-unity absorption peaks corresponding to 10.64 GHz, 12.08 GHz...
Article
Goos Hanchen shift (GHS) due to an orthorhombic biaxial slab with/without topological conducting states placed in isotropic media was investigated. The effect of varying host media, changing topological conducting states and left/right asymmetries on the co/cross polarized reflection coefficients and the corresponding GHS were investigated. Numeric...
Article
This paper reports a polarization controllable and angle-insensitive perfect metamaterial absorber (PMA). The proposed PMA consists of periodically arranged asymmetric omega-shaped resonators made of metallic copper. The absorptivity was analyzed considering the microwave C-band from 4 GHz to 8 GHz. The proposed PMA shows an absorption peak with al...
Article
In the literature there exist two models for topological insulator (TI). Model I assumes TI as a nonreciprocal biisotropic material whereas model II accommodates conducting states in the boundary condition. In this paper using an existing mathematical formulation accommodating both models, Fresnel equations and Goos Hänchen shift at the interface o...
Article
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This paper presents a highly compact frequency-selective surface (FSS) that has the potential to switch between the X-band (8 GHz–12 GHz) and C-band (4 GHz–8 GHz) for RF shielding applications. The proposed FSS is composed of a square conducting loop with inward-extended arms loaded with curved extensions. The symmetric geometry allows the RF shiel...
Article
Interaction of light and matter can be controlled and manipulated by exploiting the properties of isofrequency contours (IFCs) of a material. IFC in metamaterial/artificial anisotropic materials can be open and/or close. Class of metamaterials with open IFC are known as hyperbolic metamaterials (HMMs)/indefinite media. HMM support large wave-vector...
Article
The Goos–Hänchen (GH) shift from a planar interface of a dielectric and anisotropic medium (orthorhombic dielectric magnetic anisotropic, in our case) is determined and investigated. The wavevector plane for an anisotropic medium can be divided into four regions, which further supports propagating, propagating and evanescent, evanescent, and non-un...
Article
Analysis of Goos Hanchen shift (GHS) for a planar interface of non-integer dimensional (NID) dielectric and general medium is presented. General medium in our case can be modified into strongly absorbing, weakly absorbing or lossless dielectric medium. However, strongly absorbing medium- i.e. metals, would be our main focus in this communication. T...
Article
Full-text available
The core-shell kinds of nanoparticles are greatly useful in biomedical applications inclined to targeted drug delivery, sensing, etc. The electromagnetic interaction characteristics of silicon dioxide (SiO2)-vanadium dioxide (VO2) core-shell nanoparticle of deep subwavelength size are discussed. The assumptions allow the use of Rayleigh scattering...
Article
In this paper, we explicitly demonstrate that general anisotropic (in our case di-electric magnetic anisotropic) medium supports ghost wave (non-uniform planewave), that posses the characteristics of the both, propagating and evanescent wave. Solutions for ghost waves exist, below the threshold of tangent bifurcation in the dispersion diagram when...
Article
Full-text available
Spectral feature of gold nanowires-based hyperbolic metamaterial (NWHMM) absorber was investigated. The absorber has NWHMM surface as the top layer, which is composed of periodically arranged arrays of subwavelength-sized gold (Au) nanowires (of circular cross-section) immersed in silicon dioxide (SiO2) dielectric medium. Such NWHMM surface is over...
Article
This paper presents an intensive study on the fading statistics of massive‐MIMO vehicular communication channels. The considered second‐order fading statistics quantifiers are fading rate variance, level crossing rate, average fade duration, and coherence distance. The impact of various physical, geometric, and antenna parameters on the angular spr...
Article
Full-text available
Beamforming and multiple-input multiple-output (MIMO) antenna configurations have received worldwide interest during the recent time. Various beamforming algorithm has been proposed and employed in different applications. The Least Mean Square (LMS) algorithm has become one of the most widespread adaptive beamforming techniques because of its simpl...
Article
Full-text available
Internet of Things (IoT) enabled Smart grid (SG) is one of the most advanced technologies, which plays a key role in maintaining a balance between demand and supply by implementing demand response (DR) program. In SG, the main focus of the researchers is on home energy management (HEM) system, which is called demand side management (DSM). Appliance...
Conference Paper
Controlling power utilization in the residential area is one of the major challenges in the smart grid (SG). Demand response (DR) has played a vital role in energy management and improved it with the involvement of residential consumers who participate in such programs from utilities for scheduling their appliances to the off peak hours. In this pa...
Thesis
Full-text available
Smart grid (SG) is one of the most advanced technologies, which plays a key role in maintaining balance between demand and supply by implementing demand response (DR) program. In SG, the main focus of the researchers is on home energy management (HEM) system, which is called demand side management (DSM). Appliance scheduling is an integral part of...
Conference Paper
In an urban environment, the effect of vehicular traffic on propagation loss must be considered for accurate predictions. In contrast to the existing empirical approach that models the vehicular traffic as rising of the reflection surface, this paper presents a stochastic approach for realistic road traffic modeling. The proposed model uses traffic...
Article
Full-text available
This paper presents an analytical solution to study the reflection and transmission of an electromagnetic wave impinged upon a multilayered structure. The structure is composed of a fractal slab sandwiched by ordinary material on either side. Modified Maxwell equations for fractional dimension space are used to represent the fields in a fractal sla...
Article
Full-text available
In this article, an analytical solution for the electromagnetic modes of a Menger sponge using field equations of fractional space is presented. In order to realize the electromagnetic modes in non-integer dimension space, the fields inside the Menger sponge are expressed using a fractional parameter 2 ≤ D ≤ 3. The modes are calculated under two co...
Conference Paper
Full-text available
In this paper, an electromagnetic wave of millimeter wavelength is incident on multilayered metamaterial structure. Transfer matrix method is used to find the fields on either side of the structure. Field equations are the function of frequency, chirality, angle and length. Numerical results for both normal and oblique incident angles are presented...
Conference Paper
Full-text available
In this paper, an electromagnetic millimeter wave is incident upon periodic chiral-chiral metamaterial structure, embedded in fractional dimension space. An exact solution for reflectance and transmittance in D dimension space is obtained using transfer matrix method. The results computed for fractional dimension are compared with integer dimension...
Article
Full-text available
In this paper, it is proposed that high reflection surfaces and polarization rotators can be designed using planar stratified metamaterials (MTMs). For this purpose, structures used in design are composed of strong chiral, dielectric, double negative, chiral nihility, and single negative MTM slabs. To investigate these multilayered structures, refl...
Article
Full-text available
This paper discusses the electromagnetic characteristics of a stratified metamaterial structure placed in fractional dimension space. Reflection and transmission coefficients for plane wave incident on multilayered structure in D-dimensional space are computed. Transfer matrix method is used to study the behaviour of different planer multilayered p...
Article
This work presents general solution to the Maxwell’s equations inside a waveguide or transmission line where space is assumed to be of noninteger dimensions. The solution is a generalization of wave equation inside a waveguide or transmission line from integer dimensional space to fractional dimensional space. General analytical expressions for TE,...
Conference Paper
Full-text available
In this paper a model based on field equivalence principle (extended huygens’ principle) for annular aperture array antenna is proposed. The aperture is modeled as array of magnetic current loops. Far field expressions of array are obtained and antenna pattern has been plotted for different phases in the element of array.
Article
Full-text available
In this paper, reflection and transmission coefficients at dielectric fractal-fractal interface are discussed. The ratio of permittivity of the two dielectric fractal media is kept constant, while the dimension is varied in order to get the desired results. Conventional results are recovered for the integer dimensions. The proposed expressions are...
Article
In this paper, general solution for the electric and magnetic fields are developed using the vector potentials A and F when the wave is propagating in fractional dimensional space. Different field configurations can be analyzed using the developed expressions for electric and magnetic fields, here we have analyzed TEz and TMz modes when the wave pr...
Article
Full-text available
The present study deals with the propagation of electromagnetic fields and power in a circular waveguide, with D'B'-boundary conditions, internally coated with chiral-nihility medium. The electromagnetic fields inside the two layer circular waveguide defined by D'B'-boundary conditions, with one layer containing free space while other layer contain...
Article
Full-text available
The present study deals with the propagation of electromagnetic fields and power in a circular waveguide, with DB-boundary conditions, internally coated with chiral-nihility medium. The two layer circular waveguide defined by DB-boundary conditions, with one layer containing free space while other layer containing chiral-nihility medium, is investi...
Conference Paper
Full-text available
The spherical vector wave functions are investigated for strong chiral medium. The electromagnetic (EM) resonance in the spherical cavity with perfect electric conductor (PEC) wall, filled with strong chiral medium, is studied. The method for the investigation of frequencies at which the resonance occur is discussed using the characteristic equatio...
Article
A series form of Green’s function (GF) is developed for a fractional dimensional space with dimensions, 1 < D 2. Using this GF and the given charge distribution, the potential on a surface in fractional dimensional space is calculated. With the GF known, the electromagnetic wave propagation and radiation problem for various complex geometries can...
Article
Full-text available
High frequency electromagnetic field expressions are analyzed for the focal region of a circular reflector coated with chiral medium. Maslov's method has been used for the study of focal region fields because geometrical optics is an approximate method and fails at the focal points. The effects of chirality parameter, thickness of chiral coating an...
Conference Paper
Full-text available
The electromagnetic field expressions for the focused field of a 3-D Cassegrain system with its paraboloidal reflector coated with chiral medium are analyzed. Maslov’s method is used to find the field expressions at high frequencies. The dependency of focused field on the thickness of chiral coating, chirality parameter and relative permittivity is...
Article
Full-text available
The electric and magnetic field expressions of guided waves in three-layer planar waveguide containing strong chiral material have been investigated theoretically. All three layers are parallel to the walls of the waveguide. Middle layer of the waveguide is filled with the air however the other two layers are filled with strong chiral material. The...
Article
Left-handed material (LHM) is a hot topic of research due to its astonishing characteristics. S-shaped resonator (SSR) is one of the resonators, which can be used to fabricate LHM. In this article, a simple expression for the effective permeability of SSR is presented and is verified by the experimental results. (C) 2011 Wiley Periodicals, Inc. Mic...
Chapter
In this chapter, a fractional space generalization of potentials for static and time-varying fields is discussed. The fractional space generalization of static and time-varying potentials, provided in this chapter, can be used to study electrostatic problems in fractal media.
Chapter
In this chapter we present a procedure for solution of antenna radiation problems in fractional space along with an application of this novel procedure to the case of Hertzian dipole in fractional space. In Sect. 5.1, a novel solution procedure for antenna radiation problems in fractional space is proposed. In Sect. 5.2, the reported solution proce...
Article
Full-text available
The transmission and reflection of electromagnetic waves at dielectric-fractal interface is studied, the fractal exhibits quasi fractional space properties.~ The closed form expressions for transmission and reflection coefficients are formulated for such an interface. The classical results are obtained when integer dimensions, instead of fractio...
Book
Full-text available
This book presents the concept of fractional dimensional space applied to the use of electromagnetic fields and waves. It demonstrates the advantages in studying the behavior of electromagnetic fields and waves in fractal media. The book presents novel fractional space generalization of the differential electromagnetic equations as well as a new...
Article
Cyclic prefix based channel equalization employed in the Discrete Multitone (DMT) modulation offers the advantage of simplified implementation. However, this method has the disadvantage of amplifying channel noise for channels having deep nulls in the frequency response. The in-home power line channel is one such channel that has high noise content...
Article
Full-text available
Analysis of high frequency field expressions for the Cassegrain system having perfect electromagnetic conducting (PEMC) boundaries are studied. Both the reflectors of Cassegrain system are PEMC and are embedded in chiral medium. Two different cases have been analyzed depending upon the values of chirality parameter (kβ). In the first case, chiral m...
Article
Full-text available
A Discrete Wavelet Multitone (DWMT) transceiver is proposed for the Asymmetrical Digital Subscriber Line (ADSL) channel, which promises greater subchannel spectral containment, as compared to the Fourier transform based conventional Discrete Multitone (DMT) system. Wavelet packet transform applied in DWMT system is robust against narrowband interfe...
Chapter
The present study deals with a novel approach for fractional space generalization of the difierential electromagnetic equations. These equations can describe the behavior of electric and magnetic flelds in any fractal media. A new form of vector difierential operator Del, and its related difierential operators, is formulated in fractional space. Us...
Chapter
The wave equation has very important role in many areas of physics. It has a fundamental meaning in classical as well as quantum field theory. With this view, one is strongly motivated to discuss solutions of the wave equation in all possible situations. The wave equation in fractional space can effectively describe the wave propagation phenomenon...
Article
Rotation of left-handed materials (LHM) is presented as tuning technique in this article. For verification of proposed idea S-shaped resonator and its two modified cases are chosen as LHM. The,frequency bands of these resonators are determined experimentally with and without rotation. The comparison of results justifies the tuning technique. (C) 20...
Article
The wave equation has very important role in many areas of physics. It has a fundamental meaning in classical as well as quantum field theory. With this view, one is strongly motivated to discuss solutions of the wave equation in all possible situations. The wave equation in fractional space can effectively describe the wave propagation phenomenon...
Conference Paper
The present study deals with solution of antenna radiation problems in fractional dimensional space. Using the solution of vector potential wave equation in fractional space, we propose a novel generalized procedure for solution of radiation problems in fractional space. As an application we study the fields radiated by Hertzian dipole in α-dimensi...
Article
Full-text available
High frequency field expressions are derived around the focal point of spherical reflector placed in a chiral medium. Spherical reflector presented in this paper has prefect electromag- netic conducting (PEMC) boundary. Maslov's method is used at the vicinity of caustic region of PEMC spherical reflector placed in chiral medium because geometrical...
Article
Full-text available
A two dimensional cassegrain system is analyzed at high frequency for its focal region field, where its main parabolic reflector is coated with chiral medium. Maslov's method is used because the Geometrical Optics approximation fails at the focal point. Field's patterns are numerically calculated and the results are shown graphically. The effects o...
Article
Full-text available
The fields inside a rectangular waveguide with an internal coating of chiral nihility metamaterial are determined. These fields are then fractionalized utilizing the fractional curl operator to find the fields for the intermediate geometries which are also termed as the fractional order geometries. It is noted that no electric field exists inside t...
Conference Paper
Full-text available
Left handed material (LHM) is capable of certain unique properties which can be very useful for advancement in microwave devices and technology. LHMs have a limitation of fixed and limited working frequency bands, so various techniques to vary the working frequencies of LHM have been presented in literature. Rotation of LHM or rotation of incident w...
Article
In this paper, an exact solution of the spherical wave equation is obtained in D-dimensional fractional space. The obtained fractional space solution provides a generalization of electromagnetic wave propagation phenomenon from integer space to the fractional space. The classical results are recovered from fractional space solution, when integer...
Article
Full-text available
The present study deals with a novel approach for fractional space generalization of the differential electromagnetic equations. These equations can describe the behavior of electric and magnetic fields in any fractal media. A new form of vector differential operator Del, and its related differential operators, is formulated in fractional space. Us...
Article
Full-text available
This work deals with an exact solution of cylindrical wave equation for electromagnetic field in fractional dimensional space. The obtained fractional solution is a generalization of the cylindrical wave equation from integer dimensional space to a fractional dimensional space. The resulting theoretical framework can be used to study the phenomenon...
Article
Full-text available
This work presents the analytical solution of vector wave equation in fractional space. General plane wave solution to the wave equation for fields in source-free and lossless media is obtained in fractional space. The obtained solution is a generalization of wave equation from integer dimensional space to a non-integer dimensional space. The class...
Article
Full-text available
This paper presents the electromagnetic field expressions for 3D cassegrain system embedded in a bi-isotropic chiral medium. Mathematical formulation of Maslov is used to find the field expressions in the focal region. Effect of chirality (both the week and strong) on focal region fields is analyzed. It is seen that when the chirality effect is wea...
Article
Reflection from a perfect electric conductor (PEC) plane of infinite dimensions embedded in a second order nonlinear medium is studied. The reflected wave has two parts, one due to linear behavior, the other due to nonlinear behavior of the medium. The expressions of the reflection coefficients for parallel and perpendicular polarization cases are...
Article
Full-text available
This paper is a theoretical investigation and analysis of the focal region fields of a hyperbolic focusing lens embedded in chiral medium. Chiral-dielectric and dielectric-chiral interfaces are studied and the behavior of waves after passing through these interfaces are discussed. Geometric optics (GO) is used initially. However, it fails around th...
Article
This paper presents statistics of path loss for 60 GHz millimeter wave propagation channel simulations that are performed in the presence of humans in different indoor environments. A deterministic propagation model is used as an experimental tool to investigate the narrowband characteristics of the channel. The indoor radio propagation channel is...