Scopus İndeksli Yayınlar Koleksiyonu

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Browsing Scopus İndeksli Yayınlar Koleksiyonu by Journal "10th European Conference on Antennas and Propagation EuCAP 2016"

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    Application of dielectric resonator based metamaterial in waveguide coupler
    (Institute of Electrical and Electronics Engineers Inc., 2016) Gizem Kalender; Emine Yeşim Zoral; Mustafa Seçmen; Zoral, E. Yesim; Secmen, Mustafa; Kalender, Gizem
    In this study an implementation of the metamaterial structure is used in a waveguide directional coupler. For this purpose a four-hole waveguide directional coupler in X-band is designed. Then the block of dielectric-resonator array is inserted between isolation port and holes of the coupler and the performances of the coupler with and without dielectric resonators are compared in terms of the coupling and isolation. The obtained results show that the coupler with dielectric resonators significantly improves the coupling and isolation performances at a new operation frequency band at which the traditional coupler does not work. Therefore the metamaterial structure attains multi-band characteristics to the coupler. Besides this new frequency band can be shifted by arranging the distance between the dielectric resonators and holes. Finally it is also observed that the bandwidth of the new frequency band can be increased by using more dielectric resonators in the array. © 2017 Elsevier B.V. All rights reserved.
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    Citation - Scopus: 11
    Circularly polarized hemispherical antennas for telemetry and telecommand applications in satellite communication
    (Institute of Electrical and Electronics Engineers Inc., 2016) Ceyhan Türkmen; Mustafa Seçmen; Secmen, Mustafa; Turkmen, Ceyhan
    This study describes about Ku-band antennas with circular polarization in hemispherical radiation pattern for telemetry and telecommand applications of satellite communication. The first section of antenna contains a septum polarizer structure which converts linear-polarization to circular-polarizations (left-hand and right-hand). This structure feeds a circular aperture waveguide which is the second part. The axial ratio performance of the antenna is improved by adding some metallic rings with optimized dimensions. Therefore circular polarization is achieved in wider azimuth and elevation angles. Two different designs are carried out for 11.35-11.8 GHz and 14.3-14.65 GHz. The return losses are greater than 15 dB in the given frequency bands. Besides the axial ratio of the antenna is under 3 dB throughout 170° at azimuth and elevation which proves circular polarization property in hemispherical region. The gain at the broadside is almost 9.3 dB and it is higher than -10 dB throughout 170° angle coverage. © 2017 Elsevier B.V. All rights reserved.