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    Evaluation of electromagnetic field data of a designed microstrip patch antenna structure according to type of substrate materials and their thicknesses
    (ELSEVIER, 2019) Top, Rabia.; Gültekin, Seyfettin Sinan.; Uzer, Dilek.
    Substrate material used in microstrip antenna structures fully impact the performance of antenna and applications of it. In this work, simulations are carried out for microstrip antenna structure used in biomedical applications. Heart vessel structure used for determining heart diseases is modelled in Ansoft HFSS program. Simulations are implemented with and without occlusion in heart vein. Antenna structure is simulated with different substrate materials and different thicknesses of them. After simulations, various electromagnetic field data are obtained and evaluated for dissimilar substrate materials and thickness of them. (C) 2019 Elsevier Ltd. All rights reserved.
  • Küçük Resim
    Öğe
    Usage of T-resonator method at determination of dielectric constant of fabric materials for wearable antenna designs
    (ELSEVIER, 2019) Bayraktar, Özen.; Uzer, Dilek.; Gültekin, S. Sinan.; Top, Rabia.
    In this study, determination of dielectric constants of fabric materials accurately by using T resonator method is aimed. Dielectric constant is one of the most important parameters that have a large effect on micro strip antenna performance. Small shifting at dielectric constant can cause huge alterations on electrical parameters of the antenna, especially at high frequencies. For this reason, a T resonator is designed on the wool felt fabric as the lower layer material at constant frequencies and the resonator dimensions are calculated. Using these calculated values, the finite element method is simulated with a High Frequency Electromagnetic Field Simulation (HFSS) as a resonator. After some size optimizations, the dielectric constant of the fabric was obtained correctly from the simulations. In order to validate the accuracy of the study and the values obtained, T resonator design on woolen felt material is manufactured and measurements of the resonator is realized with a vector network analyzer. Measurements of this resonator are compared with results from simulations and calculations. As a result, it has been shown that the dielectric constant of any fabric can be accurately determined using an easy, fast and inexpensive method and can be used in wearable micro strip antenna designs (C) 2019 Elsevier Ltd. All rights reserved.