Analytical design of band-pass waveguide filter in C-band using inductive iris

Year 2023, Volume: 13 Issue: 3, 646 - 660, 15.07.2023

Sinan Biçer , Habib Doğan , İbrahim Bahadır Başyiğit , Abdullah Genç

https://doi.org/10.17714/gumusfenbil.1169961

Abstract

Rectangular waveguide (RWG) filters are commonly utilized in microwave technology due to their low loss and high power carrying capacity. In this study, analytical method design and MATLAB codes of band-pass RWG filters with symmetrical inductive iris structure in the desired degree and frequency region are given. As an example of the design, a 5th order filter in the 4.5-4.8 GHz range is analytically and numerically designed. In addition, the order of filter, the effect of different iris thicknesses and various iris types on the filter performance is investigated. The results revealed that the thickness of the iris has an effect on the frequency response of the filter, but the bending at the iris tips or the bending at the junction of the iris with the waveguide has significantly no effect on the frequency response. The filter designed with a bandwidth of 6.5% has a wider bandwidth than filters designed with a similar frequency. According to the analytical results, in the 4.5-4.8 GHz range, the value of S11 is less than -20 dB, while the value of S21 in the same region is around 0 dB. On the other hand, according to the simulation results obtained with the CST Studio Suite Microwave program, in the same frequency band, the value of S11 is less than -18 dB, while the value of S21 in the same region is about 0.09 dB.

Keywords

Band-pass filter, C band, Inductive Iris, Waveguide filter

Endüktif iris yapısı kullanarak C-bandında bant geçiren dikdörtgen dalga kılavuzu filtrenin analitik olarak tasarımı

Abstract

Mikrodalga teknolojisinde dikdörtgen dalga kılavuzu (DDK) filtreler, genellikle düşük kayıp ve yüksek güç taşıma kapasitesinden dolayı yaygın olarak kullanılırlar. Bu çalışmada, istenilen derece ve frekans bölgesinde simetrik endüktif iris yapısına sahip bant geçiren DDK filtrelerin analitik yöntemle tasarımı ve MATLAB kodları verilmiştir. Örnek bir tasarım olarak 4.5-4.8 GHz aralığında 5. dereceden bir filtre, analitik ve nümerik olarak tasarlanmıştır. Ayrıca, filtre derecesi, farklı iris kalınlıkları ve değişik iris tiplerinin filtre performansına olan etkisi incelenmiştir. Elde edilen sonuçlara göre, iris kalınlığı filtrenin frekans cevabında etkili iken, iris uçları veya irislerin dalga kılavuzuyla birleştiği noktalarda belli oranlarda yapılan ovalleştirmelerin frekans cevabında önemli bir etkisi yoktur. % 6.5 bant genişliğine sahip olarak tasarlanan DDK filtre, benzer frekansta tasarlanmış filtrelere göre daha geniş bir bant genişliğine sahiptir. Analitik sonuçlarına göre, 4.5-4.8 GHz aralığında S11 değeri -20 dB değerinden küçük iken; aynı bölgede S21 değeri, yaklaşık 0 dB civarındadır. Diğer taraftan CST Studio Suite Microwave programı ile elde edilen simülasyon sonuçlarına göre ise, aynı frekans bandında S11 değeri -18 dB değerinden küçük iken; aynı bölgede S21 değeri, yaklaşık 0.09 dB civarındadır.

Keywords

Bant geçiren filtre, C bandı, Dalga kılavuzu filtre, Endüktif iris

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