Kıvrımlı Döngü Rezonatörlü Çift Bantlı Bant Geçiren Ayarlanabilir Filtre

Öz

Radyo frekanslarında (RF) kullanılabilen ayarlanabilir filtreler, ince ayarlanabilen geçiş bandı frekanslarına sahip bant geçiren filtrelerdir (BPF). Geçiş bandı frekansı dijital, mekanik veya bir control voltajı ile değiştirilebilir. İletişim sistemleri daha karmaşık hale geldikçe, ayarlanabilir BPF tasarımlarının önemi artmaktadır. Bu çalışmada, kıvrımlı döngü rezonatörlü çift bantlı bant geçiren ayarlanabilir bir filtre önerilmiştir. SVM1413 varaktör diyot kullanılarak ve kapasitans değeri kademeli olarak değiştirilerek iki farklı bantta ayarlanabilir bir bant geçiren filtre tasarımı oluşturulması amaçlanmıştır. Uygulanabilirlik ve kapasitans değer aralığı genişliği açısından SVM1413 varaktör diyot seçilmiştir. BPF, 2.5’den 3 GHz’e ve 4.2’den 4.6 GHz’e olmak üzere iki farklı frekans aralığında çalışır. BPF, dielektrik sabiti 3 alınarak 1 mm kalınlığa sahip bir Rogers RO3003 substratı üzerinde uygulanmış ve ölçülmüştür. BPF için alt tabaka 30 × 30 mm^2 boyutunda seçilmiştir. Sayısal hesaplama sonuçları, Computer Simulation Technology (CST) kullanılarak simüle edilmiş ve optimize edilmiştir. Ekleme kaybı değerleri hem bant genişliği aralığında hem de tüm kapasitans değişikliklerinde -1 dB'nin üzerindedir. Sayısal hesaplama sonuçları kullanılan kaynakların çıktıları ile karşılaştırıldığında daha iyi sonuçlar elde edilmiştir.

Anahtar Kelimeler

• Band geçiren filtre
• kıvrımlı döngü rezonatörü
• Kompakt filtre tasarımı
• Mikroşerit filtre
• Ayarlanabilir
• CST

Dual-band Band-pass Tunable Filter with Meander-Line Resonator

Abstract

Radio frequency (RF) that can be tunable filters are band-pass filters (BPFs) with finely tunable passband frequencies. The passband frequency can be changed digitally, mechanically, or with a control voltage. Tunable BPF designs are increasing in importance as communication systems become more complex. In this study, a dual-band band-pass tunable filter with a meander-line resonator has been proposed. It aimed to create a tunable band-pass filter design in two different bands by using the SVM1413 varactor diode and gradually changing the capacitance value. SVM1413 varactor diode has been chosen in terms of applicability and capacitance value range width. The BPF operates in two different frequency ranges, from 2.5 to 3 GHz and from 4.2 to 4.6 GHz. BPF has been implemented and measured on a Rogers RO3003 substrate with a dielectric constant of 3 and a thickness of 1 mm. The substrate for the BPF has been chosen to be 30 × 30 mm^2 in size. The numerical calculation results have been simulated and optimized using computer simulation technology (CST). The insertion loss values are above -1 dB in both bandwidth ranges and all capacitance changes. Better results have been obtained when numerical calculation results have been compared with the outputs of the sources used.

Keywords

• Compact filter design
• Microstrip filter
• Tunable
• Varactor
• Meander-line resonator
• CST
• Band-pass filter

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