1.93 GHz GSM Bandında Çalışan SIW Yapılarından Esinlenilmiş Gelişmiş Performansa Sahip Mikroşerit Saplama Filtre Tasarımı

Öz

Bu makale SIW yapılarından esinlenilerek gelişmiş performansa sahip 1.93 GHz GSM bandında çalışan bir mikroşerit saplamalı filtre tasarımını sunmaktadır. Tasarlanan filtrede elektromanyetik alanların filtre içerisinde ilerlerken kapsanmasını arttırmak için mikroşerit hatların etrafına ek toprak bağlantı geçişleri yerleştirilmiştir. Filtre, çeşitli sayıdaki geçişler ve farklı geçiş-mikroşerit hat mesafeleri için elektromanyetik simülasyonlarla incelenmiştir. Sonuçlar, filtrenin geçirgen bandında ulaşılan maksimum iletim katsayısı (S21 parametresi) büyüklük değerinin geçiş sayısı arttıkça ve geçişler hatlara yaklaştıkça arttığını göstermektedir. Öte yandan, geçiş sayısı arttığında ve hatlarla aralarındaki mesafe daraldığında maksimum S21 değerinin ulaşıldığı frekans daha düşük frekanslara kaymaktadır. Tasarlanan filtrelerin üretimi de gerçekleştirildi. Ölçümlerde elde edilen sonuçlar simülasyon sonuçlarıyla oldukça uyumludur. Ayrıca, 1.93 GHz bandında çalışan alıcı sistemi inşa edilmiştir. Üretilen filtreler için oluşturulan prototip ile sistem deneyleri gerçekleştirilmiştir. Sonuçlar, herhangi bir ek toprak bağlantı geçişi bulunmayan filtre yerine, geçişlerin olduğu filtrenin kullanıldığı sistemde, filtre geçirgen bandında daha yüksek bir sinyal seviyesine ulaşıldığını ve filtre geçirgen bandı dışındaki istenmeyen sinyallerin daha fazla bastırıldığını göstermektedir. Bulgular, SIW yapılarından esinlenerek tasarlanan filtrelerin yüksek sinyal kalitesi gerektiren uygulamalar için umut verici olduğunu göstermektedir.

Anahtar Kelimeler

• Mikroşerit bantgeçiren filtre
• SIW yapısı
• 1.9 GHZ GSM bandı

Microstrip Stub Filter Design with Enhanced Performance Inspired By SIW Structures Operating at 1.93 GHz GSM Band

Öz

This paper reports a microstrip stub filter design operating at 1.93 GHz GSM band with enhanced performance inspired by SIW structures. In the designed filter additional vias are placed around the microstrip lines to enhance the encasing of the electromagnetic fields while propagating through the filter to develop the filter performance. The filter was examined with electromagnetic simulations for various numbers of vias and different via to microstrip line distances. Results show that the maximum transmission coefficient (S21 parameter) magnitude value reached in the pass band of the filter increases with the number of the vias and as the vias get closer to the lines. On the other hand, when the via number increases and the space between them and the lines narrows, the frequency at which the maximum S21 value is attained shifts to lower frequencies. The designed filters were manufactured, too. Results obtained in the measurements agree well with the simulation results. Additionally, a receiver system operating at 1.93 GHz band was constructed. System experiments were carried out with the constructed prototype for the manufactured filters. Results show that a greater signal level in the filter pass band is achieved and unwanted signals outside the filter pass band are suppressed more in the system where the filter with vias is used instead of the filter without any additional via. The findings indicate that the designed filters inspired by SIW structures are promising for applications requiring high signal quality.

Anahtar Kelimeler

• Microstrip bandpass filter
• SIW structure
• 1.9 GHZ GSM Band

Kaynakça

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