Yazar "Duman, Mustafa" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Examining the Impacts of Different Characteristics of Water on Coplanar Patch Antenna
    (Ieee, 2025) Duman, Mehmet; Mert, Oguzhan; Ozkan, Rabia; Ramazan, Feyza; Yilmaz, Yusuf; Duman, Mustafa; Knypinski, Lukasz
    Antennas are subjected to diverse environmental conditions during the transmission or reception of signals in the form of electromagnetic waves. While designed to function outdoors or in environments conducive to minimal signal attenuation, they may not always operate under such ideal circumstances. Factors such as rain induced water puddles impinging on the antenna's radiation pattern can lead to wave attenuation. Given that the conductivity enables the electric transfer of water is approximately 80 times more effective than that of air, it significantly reduces the velocity of electromagnetic waves. Consequently, such issues give rise to undesirable conditions in S_11, a critical parameter for antennas. This analysis encompasses the theoretical, simulation, and fabrication phases of a coplanar patch antenna. S_11 input reflection values were measured utilizing a Nano-VNA across various environments, including saltwater collected from the coastal area of a district (Black Sea) in Duzce, Turkiye; freshwater from the market designated for drinking purposes; mineral water; initially from a fountain source cited in literature as a remedy for kidney ailments by local inhabitants; and in an open-air setting. Signal attenuation values were compared at approximately 2.1 GHz frequency and its vicinity. Upon completion of the modelling, testing, and evaluation, it was observed water primarily contributed to signal attenuation, rendering the antenna non-functional.
  • Küçük Resim
    Öğe
    The Successful Performance of 3D-Printed Diamond-Shaped Antenna in Wireless Communication Systems: Measurement Frequency Range 0-4 GHz, Operating Frequency 3600 MHz
    (Düzce Üniversitesi, 2023) Duman, Mehmet; Duman, Mustafa; Berk, Volkan
    In this study, a three-dimensional antenna design with a diamond shape compatible with wireless communication systems, produced using a 3D printer, is presented. The aim of the study is to examine the performance of newly designed antennas created with different types than standard antenna designs using 3D printers by covering objects with copper tape and to determine whether they operate successfully. Simulation graphs of the designed antenna were obtained in the computer in the frequency range of 0-4 GHz, and the produced antenna was tested with Nano-VNA in the frequency range of 0-4 GHz. According to the literature survey, most diamond-shaped antennas produced and designed with 3D printers operate only on the 2D plane of the diamond, while in this study, the diamond shape is worked on the 3D plane. As a result, it is observed that the diamond-shaped antenna operates with an input return loss lower than -15 dB between the frequencies of 3000 MHz and 3805 MHz (laboratory measurement: 3300 MHz – 3800 MHz), indicating that the antenna demonstrates successful performance. In light of these findings, it is evident that antennas produced in the diamond shape with the proposed parameters using 3D printers can be used in wireless communication devices and 5G applications. At the same time, this study will contribute positively to the realization of antenna designs that can be created in other shapes.