Asimetrik Eşdüzlemsel Vivaldi Anten Tasarımı

Öz

Son yıllarda anten tasarım teknolojilerinin hızla gelişmesiyle geniş bant antenlerin minyatürleştirilmesi çalışmaları popülerlik kazanmıştır. Bu tür antenlerden biri olan Vivaldi Antenler mikrodalga görüntüleme, anten dizileri, yere nüfuz eden radar uygulamaları gibi alanlarda kullanılabilmektedir. Bu yazıda; basit konfigürasyon, yüksek bant genişliği özellikleri, düşük profil ve üretim sürecinde düşük maliyet gibi avantajları nedeniyle Vivaldi Antenlere boyutları küçültmek için yeni bir yöntemle yaklaşım amaçlanmıştır. Bu çalışmada Geleneksel Vivaldi Anten türlerinin aksine asimetrik eğriler kullanılmıştır. Bu eğrilerde antenin asimetrik şeklini sağlamak için farklı exponansiyel katsayılar vardır. Çalışmada tasarlanan yapı ile Eşdüzlemsel Vivaldi Antenin simülasyon sonuçları karşılaştırılmış ve tasarlanan anten benzer sonuçlar göstermiştir. Sonuçları doğrulamak için Asimetrik Vivaldi Antenin bir prototipi 4.6 dielektrik sabiti olan bir FR4 taban malzemesi üzerine üretilmiştir. Ölçüm sonuçları tasarlanan antenin 0.177GHz ve 2.74GHz frekansları arasında geri dönüş kaybının -10dB’in altında olduğunu göstermektedir ve anten %93 bant genişliğine sahiptir. Geniş frekans aralığı, basit konfigürasyon ve azaltılmış boyutlar tasarlanan anteni gelecekte genişbant anten çalışmaları için iyi bir aday yapmaktadır.

Anahtar Kelimeler

• Asimetrik Eşdüzlemsel Vivaldi Antenna
• Genişbant Anten
• Açıklığı Daralan Anten
• Ultra Geniş Bant
• Minyatürleştirme.

Asymmetrical Coplanar Vivaldi Antenna Design

Abstract

In recent years, studies about miniaturization of wideband antennas had become popular with rapid development of antenna design technologies. Vivaldi antenna is one of these antennas which can be used in different areas such as microwave imaging, antenna arrays, ground penetrating radar applications. In this paper it is intended to approach with a novel method to reduce dimensions of Vivaldi Antennas because of its advantages such as simple configuration, wide bandwidth characteristics, low profile and low cost at fabrication process. Unlike traditional forms of Vivaldi Antennas it is used asymmetrical curves in this study. These curves have a different exponential coefficient to make the antenna have an asymmetrical shape. In this study the simulation results of the designed structure and a Coplanar Vivaldi Antenna were compared and the designed antenna showed similar characteristics. To verify the results a prototype of the Asymmetrical Vivaldi Antenna was fabricated on FR4 substrate with 4.6 dielectric constant. Measurement results illustrated that return loss of the designed antenna is below -10dB between 0.177GHz and 2.74GHz frequencies and the antenna have 93% fractional bandwidth. The measurement results match simulation results. Wideband frequency range, simple configuration andreduced dimensions make the designed antenna a good candidate for wideband antenna applications in future.

Keywords

• Asymmetrical Coplanar Vivaldi Antenna
• Wideband Antenna
• Tapered Slot Antenna
• UWB
• Miniaturization.

Kaynakça

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