S-BANT MİKROŞERİT WİLKİNSON GÜÇ BÖLÜCÜ TASARIMI

Year 2021, Issue: 004, 8 - 18, 30.12.2021

Burak Dökmetaş

Abstract

Güç bölücü devreleri kablosuz haberleşme sistemlerinde yaygın olarak kullanılan pasif mikrodalga bileşenidir. Güç bölücü devre türlerinin içinde en bilineni Wilkinson güç bölücü devreleridir. Geleneksel Wilkinson güç bölücü devrelerinde, frekans spektrumda düşük frekans değerlerine gidildikçe dalga boyunun büyümesinden kaynaklı olarak boyut büyümektedir ve özellikle, L-, S-, C-bant frekans aralıklarında bu yapı oldukça büyük alan kaplamaktadır. Bundan kaynaklı olarak çeyrek dalga boyu (λ/4) iletim hatlarının boyutunun küçülmesine yönelik devre tasarım yapılarına ihtiyaç duyulmaktadır. Bu kapsamda S-bantta boyut olarak oldukça uzun olan λ/4 iletim hatlarının yerine eşlenik devre yapılarının oluşturulması amaçlanmıştır. Bu çalışmada S-bant uygulamalarına yönelik kompakt bir Wilkinson güç bölücü tasarımı, üretimi ve ölçümü hedeflenmiştir. Elde edilen ölçüm sonuçlarına göre 2-4 GHz frekans bandı içerisinde devrenin giriş ve çıkış yansıma kayıplarının -11 dB’den iyi olduğu ve araya girme kayıplarının ise -3.6 dB’den iyi olduğu görülmüştür. Ek olarak, çıkış portları arasındaki izolasyonun çalışma frekans bandı içerisinde -7.5 dB’den iyi olduğu ölçüm sonuçlarında elde edilmiştir. Önerilen güç bölücü yapısı kompakt boyutlarda, düşük maliyetli ve düşük kayıplı olması nedeniyle S-bant mikrodalga uygulamalarda kullanılabileceği düşünülmektedir.

Keywords

Wilkinson güç bölücü, mikroşerit, dairesel saplama, S-bant

S-BAND MICROSTRIP WILKINSON POWER DIVIDER DESIGN

Abstract

Power divider circuits are passive microwave components commonly used in wireless communication systems. The most popular power divider circuit is known as Wilkinson power divider. In conventional Wilkinson power divider circuits, the wavelength and size increases as the frequency decreases and especially in the L-, S-, C-band frequency ranges, this structure covers a very large area. Therefore, circuit design structures are needed to reduce the size of quarter wavelength (λ/4) transmission lines. In this context, it is aimed to create conjugate circuit structures instead of (λ/4) transmission lines, which are quite long in size. In this study, it is aimed to design, fabricate and measure a compact Wilkinson power divider for S-band applications. According the measurement results input and output return loss of the circuit is obtained better than -11dB in the 2-4 GHz frequency band. The insertion loss is obtained better than -3.6 dB in the same frequency range. In addition, the isolation between the output ports is better than -7.5 dB in the operating frequency band. The proposed power divider structure can be used in S-band microwave applications due to its compact size, low cost and low loss.

Keywords

Wilkinson power divider, microstrip, circular stub, S-band

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