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    Determination of Guided Wavelength in Multi-layer Microstrip Structures via Open Circuit T-resonator
    (Institute of Electrical and Electronics Engineers Inc., 2023) Oner, Gulden Gunay Bulut; Basbug, Suad; Altuncu, Yasemin
    In this work, an open circuit T-resonator is used to determine the guided wavelength of a dielectric structure with multiple layers having different relative permittivity values. The multi-layer substrate consists of two single-sided copper clad FR4 laminates and a layer of PETG material between these laminates to form a sandwich structure. In a T-resonator model, standing waves impacts the insertion loss of the transmission line based on the electrical length of the stub resonator that is linked to this microstrip line. By taking advantage of this property, the wavelength determination is achieved with the help of the results obtained by the Comsol software simulations. Additionally, to illustrate the feasibility of the method, we have simulated a classical microstrip antenna designed by considering the results of the T-resonator simulations. The overall results indicates that the suggested method is useful to determine the guided wavelength of multi-layered structure with different dielectric constants. © 2023 IEEE.
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    Multi-Layer I-Slot Microstrip Antenna for Internet of Things Applications
    (Institute of Electrical and Electronics Engineers Inc., 2023) Oner, Gulden Gunay Bulut; Basbug, Suad; Altuncu, Yasemin
    In this study, an antenna design is presented for the Internet of things applications that need directional antennas. The antenna design includes a multilayer I-slot microstrip patch antenna and two copper director rod elements. The multilayer I-slot microstrip patch antenna comprises three different layers. The first and third layers are FR4 materials with a dielectric constant of ?1 = 4.15 and a height of h = 1.6 mm while the second layer consists of PETG material with a dielectric constant of ?2 = 2.62 and a height of h = 4 mm. The copper rods utilized in our design are used to increase the directivity of the antenna and have a diameter of R = 2.7 mm. PETG material used in the antenna design is produced with a 3D printer. The simulations of the designed antenna in this study are carried out by using Comsol Multiphysics software. The proposed antenna produced after the design and the simulation studies. The simulation and measurement results are compared and found compatible. The antenna designed in this study for 2400-2483.5 MHz ISM band applications has a gain of 7.2 dBi and a bandwidth from 2398 MHz to 2554 MHz. © 2023 IEEE.