Near-Zero-Index Split Ring Resonator: A Lens Antenna

Year 2021, Issue: 24, 474 - 478, 15.04.2021

İsmail Yıldız Turgut İkiz , Şule Çolak , Faruk Karadağ , Muharrem Karaaslan , Duygu Nazan Gençoğlan

https://doi.org/10.31590/ejosat.903929

Abstract

In this study, a matematerial structure, which consists of rectangular split ring resonator arrays, is investigated numerically and experimentally in the frequency range from 1 GHz to 5GHz. FR-4 material is used as the substrate material due to its low cost. During the numerical analysis (simulation analysis), a parametric study is performed to determine the optimal dimension of the unit cell structure. S11 (reflection coefficient), S21 (transmission coefficient), and n (refractive index) are examined in the frequency range of interest. As a result of the parametric study, the value of n is obtained as approximately zero. By increasing the split ring width, near-zero index is observed at higher frequencies. Hence, it is also deduced that the metamaterial structure behaves as a super lens antenna at the related frequency. Numerical analysis is performed via CST Microwave Studio (MWS). The simulation results are confirmed with experimental results obtained by network analyzer.

Keywords

Split Ring Resonator, Süper Lens, Metamalzemeler

Project Number

12479

Sıfıra Yakın İndeksli Ayrık Halka Resonatörü: Lens Anten

Abstract

Bu çalışmada dikdörtgen bölünmüş halkalı rezonatör dizilerinden oluşan bir malzeme yapısı 1 GHz ile 5 GHz frekans aralığında sayısal ve deneysel olarak incelenmiştir. Düşük maliyeti nedeniyle FR-4 malzemesi alt tabaka malzemesi olarak kullanılmıştır. Sayısal analiz (simülasyon analizi) sırasında, tek hücre yapısının optimal boyutunu belirlemek için parametrik çalışma yapılmıştır. İlgili frekans aralığında S11 (yansıma katsayısı), S21 (iletim katsayısı) ve n (kırılma indisi) incelenmiştir. Parametrik çalışma sonucunda, n değeri yaklaşık sıfır olarak elde edilmiştir. Bölünmüş halka genişliği artırılarak, daha yüksek frekanslarda sıfıra yakın indeks gözlemlenmiştir. Dolayısıyla, metamalzeme yapısının ilgili frekansta bir süper lens (mercek) anten gibi davrandığı da saptanmıştır. Sayısal analiz CST Microwave Studio (MWS) aracılığıyla gerçekleştirilmiştir. Simülasyon sonuçları, ağ analizörü ile elde edilen deneysel sonuçlarla doğrulanmıştır.

Keywords

Ayrık Halka Rezonatörü, Super Lens, Metamaterials, MEMS

Supporting Institution

Çukurova Üniversitesi

Project Number

12479

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