فهرست مقالات Vivaldi antenna

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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 چکیده کامل

  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. پرونده مقاله
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  2 - 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 چکیده کامل

  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. پرونده مقاله
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  3 - Taper Design of Vivaldi Antenna by Butterworth Method
  Mahdi Ghoorchian نسرین امیری
  In this paper a method to design tapered slot antenna (TSA), a member of ultra-wideband (UWB) antenna, is presented. The proposed method is related to impedance matching of input and free space intrinsic impedance by Butterworth method. By this method, curve fitting con چکیده کامل

  In this paper a method to design tapered slot antenna (TSA), a member of ultra-wideband (UWB) antenna, is presented. The proposed method is related to impedance matching of input and free space intrinsic impedance by Butterworth method. By this method, curve fitting converts step impedance to optimized curve and this optimized curve and its symmetry create Vivaldi antenna. The fractional bandwidth (FBW) of the antenna by the proposed method is 155% which is more than the methods of Chebyshev and attenuation. A prototype of this antenna is fabricated and simulation and measurement results are in good agreement. پرونده مقاله