Kariştirma Duyarsiz Frekans Atlamali Metamalzeme Tabanli Elektromanyeti̇k Çi̇t Uygulamasi

Akcelik, Huseyin; Tuna, Çağdaş; Saraydemir, Safak; Durna, Yilmaz; Koçer, Hasan

doi:10.17341/gazimmfd.322179

Cited by 1 publication

(1 citation statement)

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“…Frekans seçici yüzeyler, yüzeye gelen elektromanyetik dalganın frekansına ve geliş açısına bağlı olarak iletim ve yansıma karakteristiği arzu edilen şekilde tasarlanabilen iki ya da üç boyutlu yapılardır [1]. Genellikle, profillerinin hafif ve üretim maliyetinin düşük olması, entegrasyon kolaylığı gibi birçok avantajları nedeni ile mikroşerit kullanılarak yapılırlar [2][3][4]. Bu yapılar metal yamalar ya da açıklık elemanlarının bir dielektrik tabaka üzerine basılması ile gerçekleştirilirler.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Açı ve polarizasyondan bağımsız ultra geniş bantlı frekans seçici yüzey tasarımı

Kocakaya

Çakır

Çimen

2019

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Highlights:Graphical/Tabular Abstract  The design of single layer frequency selective surface for ultra wide band applications  To obtain angularly stable and polarization independent transmission characteristics  Compact and unit cell with small dimension designIn this paper, design of a new single layer ultra-wide band (UWB), band-stop frequency selective surface (FSS) with polarization independent and angular stability is presented. The designed FSS consists of a circleshaped conductive strip and a ring-shaped cross-dipole conductive strip. The unit cell size that forms the UWB-FSY is 0.07λ × 0.07λ, where λ is free-space wavelength corresponding to the lowest frequency of the UWB band. The -3 dB bandwidth of proposed FSS is between 3.5 GHz and 11 GHz (at normal incidence) frequencies, which covers the entire UWB band that is defined by The U.S. Federal Communications Commission (FCC). Due to compact size of unit cell, the presented UWB-FSS has good angular stability up to 60° incident angles both perpendicular (TE) and parallel (TM) polarization. The designed UWB-FSS was simulated. Afterall, simulation results was confirmed with the measurements. Figure A. Proposed unit cell and fabricated FSS layer.Purpose: A new type single-layer band-stop frequency selective surface is designed for UWB applications. Theory and Methods:In literature it is possible to find single layer FSS designs. The frequency ranges of the few existing singlelayer UWB-FSs designs do not cover the range defined by the FCC. Thus, a single layer FSS design for UWB band is important. For this purpose the resonance frequencies of the elements constituting the unit cell are set to be in the UWB band. Thereby, -3 dB bandwidth of proposed FSS is between 3.5 GHz and 11 GHz frequencies. Results:The simulated and measured results are as follows: 3 dB bandwidth of proposed FSS is between 3.5 GHz and 11 GHz (at normal incidence) frequencies, which covers the entire UWB band that is defined by The U.S. Federal Communications Commission (FCC). Also the simulated and measured results are in a good harmony. Conclusion:The small size and symmetrical structure of the unit cell of the proposed structure provided angle stability and polarization independence up to 60°. The structure was simulated by CST Microwave Studio. The transmission coefficient was measured at different angles for TE and TM polarizations and compared with the simulation results. Simulation results and measurement results are compatible with each other. Because of these properties, the designed FSS structure is a candidate for a part of UGB systems.

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Section: Gi̇ri̇ş (Introduction)unclassified