The Effect of the Distance Between Unit Cells on the Frequency Stability of Frequency Selective Surfaces

Öz

Periyodik iletken geometriler literatürde frekans seçici yüzey (FSY) olarak adlandırılmaktadırlar. Geometrilerine bağlı olarak filtre davranışı sergileyen FSY'lerin frekans yanıtları geometrilerine, elektromanyetik dalganın geliş açısına, frekansına ve polarizasyonuna bağlıdır. Periyodik iletken geometriler arasındaki mesafe FSY'lerin en önemli parametrelerinden birisidir ve frekans cevabı üzerine olan etkisi literatürde bugüne kadar yeterince araştırılmamıştır. Bu çalışmada dört farklı FSY geometrisi seçilerek, periyodik iletken geometriler arasındaki mesafenin FSY’lerin frekans kararlılığı üzerine olan etkisi incelenmiştir. Seçilen FSY geometrilerinin benzetimleri Ansoft HFSS yazılımı tarafından gerçekleştirilmiş ve oldukça ilginç bir sonuç elde edilmiştir. Periyodik iletken geometriler arasındaki mesafe “0.1” rezonans dalga boyunun altına düşürüldüğünde beklenenin aksine FSY'in geliş açısı kararlılığının önemli ölçüde azaldığı görülmüştür. Literatürde birim hücre boyutu azaldıkça FSY’lerin frekans kararlıklarının arttığı ifade edilmektedir. Periyodik iletken geometriler arasındaki mesafe “0.1” rezonans dalga boyunun altına düştüğünde, komşu hücrelerin iletken yolları arasında meydana gelen girişimler baskın hale gelmekte ve FSY’in kararsız frekans yanıtına sahip olmasına yol açmaktadır.

Anahtar Kelimeler

• Keywords: Frequency selective surface
• FSS
• periodic structures
• incidence angle
• stability

Kaynakça

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