List of Articles Emine Avsar Aydin

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  1 - Assessment of Vivaldi Antenna Parameters for Biomedical applications
  Emine AVŞAR AYDIN
  In this paper, Microstrip-fed Vivaldi antenna is presented for Ultra-Wide Band (UWB) biomedical applications and antenna characteristic parameters such as radiation pattern, return loss (S11), and voltage standing wave ratio (VSWR) are evaluated. However, by using diffe More

  In this paper, Microstrip-fed Vivaldi antenna is presented for Ultra-Wide Band (UWB) biomedical applications and antenna characteristic parameters such as radiation pattern, return loss (S11), and voltage standing wave ratio (VSWR) are evaluated. However, by using different values of antenna parameters such as stub angle, substrate thickness, and relative dielectric constant, antenna performance in the UWB frequency range is developed to create antenna structure with the best efficiency, gain, and directivity. The design and modeling of the antenna are performed in CST Microwave Studio. Additionally, this can be used in terms of an attractive configuration for biomedical applications. Manuscript profile
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  2 - Investigation on Electromagnetic Properties of PLA/Carbon/Copper Antennas for Breast Cancer Detection
  Emine Avşar Aydin Ahmet Refah Torun
  10.52547/mjtd.10.1.1
  Breast cancer is the most common cancer of women in the globe. Microwave imaging has low power and longer wavelength signals to receive information about breast tissues and guarantees a safer and more accurate modality for regular breast control. So, the antenna is a cr More

  Breast cancer is the most common cancer of women in the globe. Microwave imaging has low power and longer wavelength signals to receive information about breast tissues and guarantees a safer and more accurate modality for regular breast control. So, the antenna is a crucial element in the microwave imaging system. This study involves analysis of the simulation results of the linear and planar microstrip array antennas in terms of high gain. In the series antenna design stage, the antenna models with high gain and directional radiation are aimed. 1x4 and 2x2 array antenna models are prepared with PLA/Carbon insulating material. Array antennas, three-dimensional full-wave electromagnetic structure analysis are designed using the CST (Computer Simulation Technology) Microwave Studio program. In the design phase, the transmission line losses of the array antennas are tried to be optimized by using T-junction and Wilkinson power divider techniques and impedance matching is realized. Also, the redundant areas in the turns are removed to minimize the undesirable reflections in the transmission line and to reduce the capacitive loading. Since the 1x4 array antenna performs better than the 2x2 array antenna, it was preferred for breast cancer simulation. Manuscript profile
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  3 - Multilayer Perceptron Approach in Breast Cancer Diagnosis
  Emine Avşar Aydin Gözde Saribaş
  Many diseases cause death in people around the world. One of them is cancer, and many types of cancer diseases are seen today. One of the cancer types that cause the most death is Breast Cancer. Early diagnosis has an essential place in Breast Cancer as it is crucial in More

  Many diseases cause death in people around the world. One of them is cancer, and many types of cancer diseases are seen today. One of the cancer types that cause the most death is Breast Cancer. Early diagnosis has an essential place in Breast Cancer as it is crucial in every disease. Thanks to early diagnosis, the patient's survival rate increases as a result of the treatment applied. Today, many studies are carried out and developed to be able to diagnose breast cancer early. The work done with the algorithms found in machine learning is just one example. In this paper, MLP (Multilayer Perceptron), which is one of the Machine Learning methods, and the algorithm in Breast Cancer Diagnosis is explained using the data collected in the Department of General Surgery, University Wisconsin, Center of Clinical Sciences. Manuscript profile
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  4 - Formulation of the Diffraction Problem of Almost Grazing Incident Plane Wave by an Anisotropic Impedance Wedge
  Emine Avsar Aydin Turgut İkiz
  In this paper, formulation of the problem of plane wave diffraction by a wedge with anisotropic impedances is given for the case of almost grazing incidence. All steps of problem are given in detailed. Wedge is a canonic structure and diffraction from wedge may be used More

  In this paper, formulation of the problem of plane wave diffraction by a wedge with anisotropic impedances is given for the case of almost grazing incidence. All steps of problem are given in detailed. Wedge is a canonic structure and diffraction from wedge may be used in modelling scattering from a variety of complex structures. In this study, by using the Maxwell’s equations the field components can be expressed in terms of z-components. By applying appropriate boundary conditions, a coupled system of equations is obtained in terms of field component and derivatives of field components with respect to  and r. By using similarity transform to the coupled system of equations, the coupling is reduced to the simplest form in which Malyuzhinets theorem can be applied. The solution of field components is sought in the form of Sommerfeld integrals. The Malyuzhinets theorem is applied to the Sommerfeld integrals. By using Sommerfeld integrals the problem is reduced to a system of coupled functional equations. Solution of homogeneous functional equations is given in terms of χф functions. For a small parameter of the problem (sinθ0<<1 where θ0 is the angle between z-axis and incident wave) the perturbation procedure is used to reduce the coupled functional equations to a system of linear equations with this small parameter being at the integral terms of equations. As a result the closed form solution is given for functional equations. The obtained analytic expression for the spectral functions is substituted to the Sommerfeld integrals, which are evaluated by means of steepest descent technique.Then, the analytical expressions for the diffraction coefficient for both magnetic and electric field components are derived. Considering these different geometries and small skewness angle, it is concluded that this approach enlarge the class of solvable diffraction problem in a small range. Additionally, the results are valuable for the comparison purposes for the other approximate methods. Manuscript profile
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  5 - An Approximate Solution for the Scattering of High-Frequency Plane Electromagnetic Waves from a Perfectly Conducting Strip
  Turgut İKİZ Emine AVŞAR AYDIN
  An analytical method has been developed for the scattering of high-frequency plane electromagnetic waves from a perfectly conducting strip. The solution is much simpler compared to the other methods and gives quite accurate results for ka>>1. Using Green’s Theorem More

  An analytical method has been developed for the scattering of high-frequency plane electromagnetic waves from a perfectly conducting strip. The solution is much simpler compared to the other methods and gives quite accurate results for ka>>1. Using Green’s Theorem, the scattering field has been expressed by an integral of the current induced on the strip. With the integral expression of Hankel function, a Fourier transform of the induced current and thus, an integral equation in spectral domain has been derived. Using some required transformation on the induced surface current, the obtained spectral equation has been reduced to its simplest form and then an approximate solution could be derived for the reduced spectral equation for ka>>1. Using this approximate solution the field related quantities such as radiation pattern and radar cross section can be obtained easily; but the induced current and current related quantities requires the numerical solution of the algebraic set of equations obtained by expressing the current in the form of an infinite series which satisfies the boundary conditions on the surface of the conducting strip. Manuscript profile
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  6 - Evaluation of Breast Tumor with Antipodal Vivaldi Antenna
  Emine AVŞAR AYDIN
  Subsurface scanning problems, which both it is one of microwave imaging techniques and there are applications in various fields, has become a very interesting topic today. Many methods have been developed to detect cancer cells. The electrical properties of malignant ca More

  Subsurface scanning problems, which both it is one of microwave imaging techniques and there are applications in various fields, has become a very interesting topic today. Many methods have been developed to detect cancer cells. The electrical properties of malignant cancer cells compared to normal cells indicate significant differences at microwave frequencies. Since breast tissue according to such as brain and muscle tissues is permeable than these tissues, this case supports the idea of imaging of cancerous cells in the microwave range. Various techniques such as mammography for breast cancer diagnosis are inadequate in detecting malignant cells, have high cost, and also patients are exposed harmful rays. Because of these, it is not a desirable situation. Therefore, non-ionizing electromagnetic waves used to detect cancerous cells in the human body has been widely used in biomedical applications nowadays. In this paper, both an antipodal Vivaldi antenna with enhanced bandwidth and a 3D breast structure which has different permittivity and conductivity is modelled in CST software simulation tool to solve electromagnetic field values. Return loss, VSWR, and radiation pattern characteristics which are significant antenna parameters are simulated and obtained whether the antenna possess an efficient characteristic or not. Also, electric field values over the breast tissue with tumor and without tumor are evaluated. Manuscript profile
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  7 - Plane Wave Diffraction Problem Analysis Using Microwave Technology and with Application for Breast Scanning
  Emine Avşar Aydin
  This paper presents an analytical solution to the problem of non-invasively detecting an object in a medium using a microwave signal applied from the surface. This solution is based on the one and two-dimensional microwave inverse calculation methods. Since the dielectr More

  This paper presents an analytical solution to the problem of non-invasively detecting an object in a medium using a microwave signal applied from the surface. This solution is based on the one and two-dimensional microwave inverse calculation methods. Since the dielectric properties of the object and the medium are different from each other, the backscattered electromagnetic waves can characterize the properties of the object and the medium. The impedance and reflection coefficients are calculated from the forward and backscattered signals as a function of the frequency. An analytical-numerical method is developed to analyze how an H-polarized plane wave is diffracting from two axisymmetric infinitely long strips located at the z-axis and have the same width. A straightforward solution to a problem difficult to solve is presented using hybrid analytical-numeric methods. Detecting tumors in breast tissue is one of the critical areas that the method will be effectively used. The solution is successfully applied to the breast tissue to detect the tumor inside it. Different scenarios are presented along with their numerical examples and radar cross-section data. From the insight obtained from these numerical examples, the scattering characteristics of the far-field are discussed to emphasize the contribution of the presented solution. Manuscript profile