Wide-Angle, Low Profile Hybrit Metasurface Polarization Converter for Ku Band Application

Öz

In this study, metasurface based reflective linear and circular polarization converter was aimed for microwave Ku band applications. The proposed microwave device provides linear to linear polarization conversion in the x direction by reflecting the incoming wave polarized in the y direction of the electric field intensity. For this purpose, the proposed metasurface polarization converter works in the 12 GHz-18 GHz range with a 90% polarization conversion ratio (PCR) performance. In addition, the proposed design performs right-handed polarization conversion in the range of 11.01-11.19 GHz and in the range of 20.79-22.08 GHz. The proposed design was designed with easily accessible FR-4 material, and copper was chosen as the metal for the metasurface and metal termination. The oblique angle performance of the designed device works with 80% polarization conversion rate performance up to 50 degrees. In order to understand the physical mechanism of the microwave device, surface current analysis was investigated in strong resonance regions. In addition, the equivalent circuit approach and the microwave transmission line model are shown for a better understanding of the physical mechanism. The proposed design was designed with a CST microwave simulator and fabricated with conventional PCB techniques for real-time application. To verify the simulation results, the real-time measurements of the produced device were experimentally verified using free space measurements. The results were compared with the studies in the literature and compared to other Ku band polarization converters in the literature, it provides not only linear conversion but also circular polarization. In addition, the manufactured design consist of FR4 material, which is a more accessible material compared to other Ku band applications in the literature

Anahtar Kelimeler

• Polarization
• Metasurface
• Ku band

Ku Band Uygulamalar İçin Geniş Açı, Basit Dizayn Hibrit Metayüzey Polarizasyon Dönüştürücü

Öz

Bu çalışmada mikrodalga Ku bandı uygulamaları için metayüzey bazlı yansıtıcı lineer ve dairesel polarizasyon dönüştürücü amaçlandı. Önerilen mikrodalga aygıt, elektrik alan şiddeti y yönünde polarize gelen dalgayı x yönünde yansıtarak lineerden lineere polarizasyon dönüşümü sağlamaktadır. Bu amaçla önerilen metayüzey polarizasyon dönüştürücü 12 GHz-18 GHz aralığında %90 polarizasyon dönüşümü oranı (PCR) performansı ile çalışmaktadır. Ayrıca önerilen dizayn 11.01-11.19 GHz aralığında ve 20.79-22.08 GHz aralığında sağ elli polarizasyon dönüşümü gerçekleştirmektedir. Önerilen dizayn kolay erişilebilir FR-4 malzemesi ile dizayn edilmiş olunup, metayüzey ve metal sonlandırma için metal olarak bakır seçilmiştir. Tasarlanan aygıtın eğik açı performansı 50 dereceye kadar %80 polarizasyon dönüşüm oranı performansı ile çalışmaktadır. Mikrodalga aygıtın fiziksel mekanizmasının anlaşılması için yüzey akım analizi güçlü rezonans bölgelerinde incelendi. Ayrıca fiziksel mekanizmasının daha iyi anlaşılması için eşdeğer devre yaklaşımı ile mikrodalga iletim hattı modeli gösterildi. Önerilen dizayn CST mikrodalga simülatörü ile dizayn edildi ve gerçek zamanlı uygulaması için geleneksel PCB teknikleri ile üretildi. Simulasyon sonuçlarının doğrulaması için üretilen aygıtın gerçek zamanlı ölçümleri serbest uzay ölçümleri kullanılarak deneysel olarak doğrulandı. Sonuçlar literatürde yer alan çalışmalarla kıyaslanıldı ve literatürde yer alan diğer Ku bandı polarizasyon dönüştürücülere kıyasla sadece lineer dönüşüm sağlamayıp aynı zamanda dairesel polarizasyon da sağlamaktadır. Ayrıca üretilen dizayn literatürde yer alan diğer Ku band uygulamalara kıyasla daha kolay erişilebilir materyal olan FR4 material ile dizayn edilmiştir.

Anahtar Kelimeler

• Polarizasyon
• Metayüzey
• Ku band

Kaynakça

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