Prof. Dr. Wa'il A. Godaymi Al-Tumah | University of Basrah (original) (raw)
Papers by Prof. Dr. Wa'il A. Godaymi Al-Tumah
1ST SAMARRA INTERNATIONAL CONFERENCE FOR PURE AND APPLIED SCIENCES (SICPS2021): SICPS2021
This paper uses Ansoft High Frequency Structure Simulator software to designed new structures of ... more This paper uses Ansoft High Frequency Structure Simulator software to designed new structures of a circular microstrip antenna operating in X-band microwave frequency. The new proposed antenna was designed by making an etch slots on the patch of this antenna to enhance bandwidth and gain. This antenna design consists of slots with an annular ring and square shapes in different sizes. The annular ring slot is inside the circular patch and the other four square slots are etched on patch edge. Several parameters like input impedance, radiation patterns, return loss and gain were studying in this work. The results of gain and bandwidth of simulated reflection coefficients at-10 dB were 8.10 dB and 1.129 GHz, with resonant frequency 10.06 GHz. Therefore, the new antenna satisfies the request of the application in system of modern wireless communication.
Basrah University, 2010
The paper discusses the analytical study of spherical arrays of annular ring microstrip antenna (... more The paper discusses the analytical study of spherical arrays of annular ring microstrip antenna (ARMSA) elements excited by electric dipole. A new empirical relation for calculating the nonunifrom current amplitude distributions of these elements has been obtained. The relation contains the information about the current amplitude factor () ∆ of the antenna elements of the spherical array. The narrow beamwidth and low side lobe levels can be obtain by choosing appropriate the current amplitude factor. It is found that for current amplitude factor () 5. 0 = ∆ the radiation pattern have narrow beamwidth and low side lobe levels compared with uniform current distribution array. Circular polarization is realized by this study depends on the spherical array geometry. By using appropriate phase of each antenna elements in spherical arrays, radiation pattern is steered without change of gain and beamwidth.
Journal of Kufa-Physics, 2021
The short backfire antenna is one of the important types of antennas due to its high directional ... more The short backfire antenna is one of the important types of antennas due to its high directional and other characteristics. Therefore, this research deals with, a theoretical study to calculate the radiative structures of a short backfire antenna as an axially symmetric body using the moment method. The main goal is to theoretically calculate the radiation fields and compare them with previous practical researches. Where the mathematical analysis with the used software was verified by comparing the results and noting the extent of the match. The other goal is to study the effect of the antenna dimensions on its performance by studying the effect of adding a rim to the edge of the large back reflector, as well as studying the change of the radius of the two reflectors (large and small), where it was confirmed that the best value for the radius of the large reflectors and small (Rm=1λ) (Rs= 0.25 λ) respectively.
Journal of Physics: Conference Series
In this paper, different shapes of an E-patch microstrip antenna designed and operating at x- and... more In this paper, different shapes of an E-patch microstrip antenna designed and operating at x- and ku-bands by using High Frequency Structure Simulator (HFSS) software version 13. The finite element method used to solve electromagnetic values. The dielectric substrate material is Arlon AD320A (tm) with dielectric constant (εr = 3.2) and thickness h=1.79 mm used in this design. The new designs including modifying and slotting E-patch increased the gain of proposed antennas and provided a dual band frequency in x- and ku- bands. The return loss, voltage standing wave ratio (VSWR) and radiation patterns are evaluated.
Journal of Physics: Conference Series
In this paper, a new design simulation of multi-forked microstrip patch antenna is presented. The... more In this paper, a new design simulation of multi-forked microstrip patch antenna is presented. The proposed antenna design consists of rectangular patch structure loaded multi-slotted forked as a novel shaped of the patch, with Arlon AD320A (tm) dielectric. The coaxial probe feed technique and microstrip edge feed are used as a direct feed. The composite effect of integrating these multi-shapes forked patches techniques introducing the new multi-slotted patch. The best results of the proposed antennas were a wide impedance bandwidth which is 114% at 10.31 GHz resonance frequency for the microstrip line feed approach and maximum achievable gain is 6.3 dB for the coaxial probe feed approach. The simulated results of return loss, radiation patterns, and voltage standing wave ratio are obtained by using the finite element HFSS 13.0 software
The research contained in this thesis is a theoretical study of antenna design and calculation of... more The research contained in this thesis is a theoretical study of antenna design and calculation of the radiation fields using electric fields integral equation (EFIE) and magnetic field integral equation (MFIE). These equation have been converted, using the method of moments formulation of electromagnetic radiation in this these based on the bodies of revolution (BoR),which are generated by revolution a planar curve about an axis called axis of symmetry. To find an unknown electric current density on the surface of the conductor ,and both unknowns electric and magnetic density current on the surface of the dielectric which are responsible for the generation of radiation fields in the space for the components (Eθ ,Eφ) ,the surface currents was represented by a set of basis functions that give the Fourier series because the body has a circular symmetry property and then select a set of weighted functions to find a linear system by using Galerkin method which requires that the weighted ...
ABSTRACT In this paper we investigate the electromagnetic scattering by dielectric bodies of revo... more ABSTRACT In this paper we investigate the electromagnetic scattering by dielectric bodies of revolution (DBOR) with attached wires in the present of common region (junction) between wire and BOR surface, Where the formed composite and irregular . A surface integral equation (SIE) technique is developed to analyze the scattering properties. Two vector integral equations (IEs) by via Maxwell's equation, Greens theorem, and the boundary conditions are used. The formulations are generated by the standard electric field integral equation (EFIE) and PMCHWT, and numerically evaluated by the method of moment (MoM) technique with Galerkin's approach. The numerical results are validated for DBOR and compared with that of other researchers, while for DBOR-wire-junction compared with conductor bodies of revolution (CBOR)-wire-junction, which satisfied by comparing with experimental data. Furthermore, the addition of attached wires significantly alters the constant CBOR and DBOR cross-section, and the effect of changing εr will be disparate among different values.
Journal of Natural Sciences Research, 2016
In this paper, theoretical study of circular microstrip antenna loaded two annular (CMSAL2AR) and... more In this paper, theoretical study of circular microstrip antenna loaded two annular (CMSAL2AR) and calculation of the radiation pattern using principle equivalence with moment of method formulation of electromagnetic radiation in this these based on the bodies of revolution (BoR), which are generated by revolution a planar curve about an axis called axis of symmetry to solving the electric fields integral equation (EFIE) and magnetic field integral equation (MFIE). To find an unknown electric current density on the conductor surface ,and both unknowns electric and magnetic density current on the dielectric surface which are responsible for the generation of far fields radiation in the space for the components (E θ ,E φ ) ,the surface currents was represented by a set of basis functions that give the Fourier series because the body has a circular symmetry property and then select a set of weighted functions to find a linear system by using........
Wrapped antennas are described as the omnidirectional coverage antennas, thus it has been discuss... more Wrapped antennas are described as the omnidirectional coverage antennas, thus it has been discussed in wide studies. In this study shows how to calculate the radiation pattern for a wraparound microstrip antenna by solving the integral equation of the electric and magnetic fields. The modelling has been done by representing the body with regular geometrical shape such as a Body of Revolution (BoR). The wraparound microstrip antenna is considered as a conducing cylinder patch which be uniformly coated around a lossless dielectric having dielectric constant. Both are substrates around a conducing cylinder as ground patch. Analytically the prediction results have been calculated using the Method of Moment (MoM). It is worth noting that these predictions are in a good qualitative agreement with previous studies. We also has been examined the case involving two simultaneous patches using the electromagnetic boundary conditions to solve the differential and integral equations. These types...
This paper present a study of characteristics of the radiation from a coaxial waveguide as an ant... more This paper present a study of characteristics of the radiation from a coaxial waveguide as an antenna and a short backfire antenna (SBFA) fed by this coaxial waveguide. It is shown that the performance of such antenna is preferable in comparison with that fed by a circular waveguide, and a good agreement has been obtained between the predicated results and those reported by other research workers.
In this work, new structures of circular microstrip antenna based on slots are designed and simul... more In this work, new structures of circular microstrip antenna based on slots are designed and simulated to operate with triple band applications. These slots are annular ring and rectangular shapes in different sizes. The annular ring slot is etched inside the circular patch while the other two rectangular slots are etched on the circular patch edge. The suggested antennas are simulated using version 13 of Ansoft High Frequency Structure Simulator (HFSS). The various parameters such as input impedance, reflection coefficient, gain, radiation patterns and surface currents were investigated. The present results observed that the optimum antenna designed is resonating at three frequencies 2.695, 5.799 and 8.323 GHz. Also, the bandwidths of simulated reflection coefficients at -10 dB are 106, 204 and 371 MHz which are identical with the S-, C- and X-bands frequencies, respectively. Therefore, the optimum antenna designed can be used in the space saving applications in addition to its impo...
Iraqi Journal of Pharmaceutical Sciences, 2021
The novel severe acute respiratory syndRome coronavirus 2 (SARS-CoV-2) caused a pandemic of coron... more The novel severe acute respiratory syndRome coronavirus 2 (SARS-CoV-2) caused a pandemic of coronavirus disease 2019 (COVID-19) which represents a global public health crisis. Based on recent published studies, this review discusses current evidence related to the transmission, clinical characteristics, diagnosis, management and prevention of COVID-19. It is hoped that this review article will provide a benefit for the public to well understand and deal with this new virus, and give a reference for future researches. © 2021 University of Baghdad - College of Pharmacy. All rights reserved.
In this work, a simulated study was carried out for designing a novel spiral rectangular patch of... more In this work, a simulated study was carried out for designing a novel spiral rectangular patch of microstrip antenna that is used in ultra-wideband applications by using a high frequency structure simulator software (HFSS). A substrate with dielectric constant of 4.4 and height 2.10 mm (commercial substrate height available is about 0.8-1.575 mm) has been used for the design of the proposed antenna. The design basis for enhancing bandwidth in the frequency range 6.63 10.93 GHz is based on increasing the edge areas that positively affect the antenna's efficiency. This design makes the designed antenna cost less by reducing the area of the patch. It has been noticed that the bandwidth of the antenna under this study is increasing to 4.30 GHz or 61% compared with 3.6% for the standard rectangular microstrip antenna with the same dimensions of the proposed antenna. The antenna also maintains the voltage standing wave ratio of 1.09 at resonant frequency 7.07 GHz, return loss -27.07 d...
Pakistan Journal of Biological Sciences
In this work, the electromagnetic scattering from dielectrically coated bodies of revolution (DCB... more In this work, the electromagnetic scattering from dielectrically coated bodies of revolution (DCBOR) with attached wires is presented. The equivalent principle is used to generate the surface integral equation formulations for the problem, which introduces by the surface electric current density on the conducting surface and both electric and magnetic surface current densities on the dielectric surface. The method of moments (MoM) with Galerkin approach is used to solve the resulting system of integral equations (IEs). The choice of DCBOR with attached electrical wires as the scatterer, came from the importance of the application used in this research, which representing a proposed model of irregular shape and partially coated ( just in BOR region). Numerical results for the scattering from this model by using partially coated of the radar absorbing materials (RAM) include complex parameters ,electric permittivity ϵ and magnetic permeability μ, for electric and magnetic absorbing ma...
1ST SAMARRA INTERNATIONAL CONFERENCE FOR PURE AND APPLIED SCIENCES (SICPS2021): SICPS2021
This paper uses Ansoft High Frequency Structure Simulator software to designed new structures of ... more This paper uses Ansoft High Frequency Structure Simulator software to designed new structures of a circular microstrip antenna operating in X-band microwave frequency. The new proposed antenna was designed by making an etch slots on the patch of this antenna to enhance bandwidth and gain. This antenna design consists of slots with an annular ring and square shapes in different sizes. The annular ring slot is inside the circular patch and the other four square slots are etched on patch edge. Several parameters like input impedance, radiation patterns, return loss and gain were studying in this work. The results of gain and bandwidth of simulated reflection coefficients at-10 dB were 8.10 dB and 1.129 GHz, with resonant frequency 10.06 GHz. Therefore, the new antenna satisfies the request of the application in system of modern wireless communication.
Basrah University, 2010
The paper discusses the analytical study of spherical arrays of annular ring microstrip antenna (... more The paper discusses the analytical study of spherical arrays of annular ring microstrip antenna (ARMSA) elements excited by electric dipole. A new empirical relation for calculating the nonunifrom current amplitude distributions of these elements has been obtained. The relation contains the information about the current amplitude factor () ∆ of the antenna elements of the spherical array. The narrow beamwidth and low side lobe levels can be obtain by choosing appropriate the current amplitude factor. It is found that for current amplitude factor () 5. 0 = ∆ the radiation pattern have narrow beamwidth and low side lobe levels compared with uniform current distribution array. Circular polarization is realized by this study depends on the spherical array geometry. By using appropriate phase of each antenna elements in spherical arrays, radiation pattern is steered without change of gain and beamwidth.
Journal of Kufa-Physics, 2021
The short backfire antenna is one of the important types of antennas due to its high directional ... more The short backfire antenna is one of the important types of antennas due to its high directional and other characteristics. Therefore, this research deals with, a theoretical study to calculate the radiative structures of a short backfire antenna as an axially symmetric body using the moment method. The main goal is to theoretically calculate the radiation fields and compare them with previous practical researches. Where the mathematical analysis with the used software was verified by comparing the results and noting the extent of the match. The other goal is to study the effect of the antenna dimensions on its performance by studying the effect of adding a rim to the edge of the large back reflector, as well as studying the change of the radius of the two reflectors (large and small), where it was confirmed that the best value for the radius of the large reflectors and small (Rm=1λ) (Rs= 0.25 λ) respectively.
Journal of Physics: Conference Series
In this paper, different shapes of an E-patch microstrip antenna designed and operating at x- and... more In this paper, different shapes of an E-patch microstrip antenna designed and operating at x- and ku-bands by using High Frequency Structure Simulator (HFSS) software version 13. The finite element method used to solve electromagnetic values. The dielectric substrate material is Arlon AD320A (tm) with dielectric constant (εr = 3.2) and thickness h=1.79 mm used in this design. The new designs including modifying and slotting E-patch increased the gain of proposed antennas and provided a dual band frequency in x- and ku- bands. The return loss, voltage standing wave ratio (VSWR) and radiation patterns are evaluated.
Journal of Physics: Conference Series
In this paper, a new design simulation of multi-forked microstrip patch antenna is presented. The... more In this paper, a new design simulation of multi-forked microstrip patch antenna is presented. The proposed antenna design consists of rectangular patch structure loaded multi-slotted forked as a novel shaped of the patch, with Arlon AD320A (tm) dielectric. The coaxial probe feed technique and microstrip edge feed are used as a direct feed. The composite effect of integrating these multi-shapes forked patches techniques introducing the new multi-slotted patch. The best results of the proposed antennas were a wide impedance bandwidth which is 114% at 10.31 GHz resonance frequency for the microstrip line feed approach and maximum achievable gain is 6.3 dB for the coaxial probe feed approach. The simulated results of return loss, radiation patterns, and voltage standing wave ratio are obtained by using the finite element HFSS 13.0 software
The research contained in this thesis is a theoretical study of antenna design and calculation of... more The research contained in this thesis is a theoretical study of antenna design and calculation of the radiation fields using electric fields integral equation (EFIE) and magnetic field integral equation (MFIE). These equation have been converted, using the method of moments formulation of electromagnetic radiation in this these based on the bodies of revolution (BoR),which are generated by revolution a planar curve about an axis called axis of symmetry. To find an unknown electric current density on the surface of the conductor ,and both unknowns electric and magnetic density current on the surface of the dielectric which are responsible for the generation of radiation fields in the space for the components (Eθ ,Eφ) ,the surface currents was represented by a set of basis functions that give the Fourier series because the body has a circular symmetry property and then select a set of weighted functions to find a linear system by using Galerkin method which requires that the weighted ...
ABSTRACT In this paper we investigate the electromagnetic scattering by dielectric bodies of revo... more ABSTRACT In this paper we investigate the electromagnetic scattering by dielectric bodies of revolution (DBOR) with attached wires in the present of common region (junction) between wire and BOR surface, Where the formed composite and irregular . A surface integral equation (SIE) technique is developed to analyze the scattering properties. Two vector integral equations (IEs) by via Maxwell's equation, Greens theorem, and the boundary conditions are used. The formulations are generated by the standard electric field integral equation (EFIE) and PMCHWT, and numerically evaluated by the method of moment (MoM) technique with Galerkin's approach. The numerical results are validated for DBOR and compared with that of other researchers, while for DBOR-wire-junction compared with conductor bodies of revolution (CBOR)-wire-junction, which satisfied by comparing with experimental data. Furthermore, the addition of attached wires significantly alters the constant CBOR and DBOR cross-section, and the effect of changing εr will be disparate among different values.
Journal of Natural Sciences Research, 2016
In this paper, theoretical study of circular microstrip antenna loaded two annular (CMSAL2AR) and... more In this paper, theoretical study of circular microstrip antenna loaded two annular (CMSAL2AR) and calculation of the radiation pattern using principle equivalence with moment of method formulation of electromagnetic radiation in this these based on the bodies of revolution (BoR), which are generated by revolution a planar curve about an axis called axis of symmetry to solving the electric fields integral equation (EFIE) and magnetic field integral equation (MFIE). To find an unknown electric current density on the conductor surface ,and both unknowns electric and magnetic density current on the dielectric surface which are responsible for the generation of far fields radiation in the space for the components (E θ ,E φ ) ,the surface currents was represented by a set of basis functions that give the Fourier series because the body has a circular symmetry property and then select a set of weighted functions to find a linear system by using........
Wrapped antennas are described as the omnidirectional coverage antennas, thus it has been discuss... more Wrapped antennas are described as the omnidirectional coverage antennas, thus it has been discussed in wide studies. In this study shows how to calculate the radiation pattern for a wraparound microstrip antenna by solving the integral equation of the electric and magnetic fields. The modelling has been done by representing the body with regular geometrical shape such as a Body of Revolution (BoR). The wraparound microstrip antenna is considered as a conducing cylinder patch which be uniformly coated around a lossless dielectric having dielectric constant. Both are substrates around a conducing cylinder as ground patch. Analytically the prediction results have been calculated using the Method of Moment (MoM). It is worth noting that these predictions are in a good qualitative agreement with previous studies. We also has been examined the case involving two simultaneous patches using the electromagnetic boundary conditions to solve the differential and integral equations. These types...
This paper present a study of characteristics of the radiation from a coaxial waveguide as an ant... more This paper present a study of characteristics of the radiation from a coaxial waveguide as an antenna and a short backfire antenna (SBFA) fed by this coaxial waveguide. It is shown that the performance of such antenna is preferable in comparison with that fed by a circular waveguide, and a good agreement has been obtained between the predicated results and those reported by other research workers.
In this work, new structures of circular microstrip antenna based on slots are designed and simul... more In this work, new structures of circular microstrip antenna based on slots are designed and simulated to operate with triple band applications. These slots are annular ring and rectangular shapes in different sizes. The annular ring slot is etched inside the circular patch while the other two rectangular slots are etched on the circular patch edge. The suggested antennas are simulated using version 13 of Ansoft High Frequency Structure Simulator (HFSS). The various parameters such as input impedance, reflection coefficient, gain, radiation patterns and surface currents were investigated. The present results observed that the optimum antenna designed is resonating at three frequencies 2.695, 5.799 and 8.323 GHz. Also, the bandwidths of simulated reflection coefficients at -10 dB are 106, 204 and 371 MHz which are identical with the S-, C- and X-bands frequencies, respectively. Therefore, the optimum antenna designed can be used in the space saving applications in addition to its impo...
Iraqi Journal of Pharmaceutical Sciences, 2021
The novel severe acute respiratory syndRome coronavirus 2 (SARS-CoV-2) caused a pandemic of coron... more The novel severe acute respiratory syndRome coronavirus 2 (SARS-CoV-2) caused a pandemic of coronavirus disease 2019 (COVID-19) which represents a global public health crisis. Based on recent published studies, this review discusses current evidence related to the transmission, clinical characteristics, diagnosis, management and prevention of COVID-19. It is hoped that this review article will provide a benefit for the public to well understand and deal with this new virus, and give a reference for future researches. © 2021 University of Baghdad - College of Pharmacy. All rights reserved.
In this work, a simulated study was carried out for designing a novel spiral rectangular patch of... more In this work, a simulated study was carried out for designing a novel spiral rectangular patch of microstrip antenna that is used in ultra-wideband applications by using a high frequency structure simulator software (HFSS). A substrate with dielectric constant of 4.4 and height 2.10 mm (commercial substrate height available is about 0.8-1.575 mm) has been used for the design of the proposed antenna. The design basis for enhancing bandwidth in the frequency range 6.63 10.93 GHz is based on increasing the edge areas that positively affect the antenna's efficiency. This design makes the designed antenna cost less by reducing the area of the patch. It has been noticed that the bandwidth of the antenna under this study is increasing to 4.30 GHz or 61% compared with 3.6% for the standard rectangular microstrip antenna with the same dimensions of the proposed antenna. The antenna also maintains the voltage standing wave ratio of 1.09 at resonant frequency 7.07 GHz, return loss -27.07 d...
Pakistan Journal of Biological Sciences
In this work, the electromagnetic scattering from dielectrically coated bodies of revolution (DCB... more In this work, the electromagnetic scattering from dielectrically coated bodies of revolution (DCBOR) with attached wires is presented. The equivalent principle is used to generate the surface integral equation formulations for the problem, which introduces by the surface electric current density on the conducting surface and both electric and magnetic surface current densities on the dielectric surface. The method of moments (MoM) with Galerkin approach is used to solve the resulting system of integral equations (IEs). The choice of DCBOR with attached electrical wires as the scatterer, came from the importance of the application used in this research, which representing a proposed model of irregular shape and partially coated ( just in BOR region). Numerical results for the scattering from this model by using partially coated of the radar absorbing materials (RAM) include complex parameters ,electric permittivity ϵ and magnetic permeability μ, for electric and magnetic absorbing ma...