Oral OLTULU, Selami PALAZ, Amirullah M. MAMEDOV

Dönen Kare Çubuklu İki Boyutlu Fononik Kristalin Dispersiyon Özellikleri

Bu çalışmada, bir kare örgülü hava matrisinde yer alan kare şekilli saçılardan oluşan iki boyutlu fononikkristallerin bant yapısı çalışıldı. Bant yapısı hesaplamaları için, bir hava matrisindeki kare LiNbO3çubuklarından oluşan iki boyutlu bir fononik kristal dikkate alındı. Kare çubukların yönelimlerinin akustikbant aralıkları üzerindeki etkisi, iletim kaybı spektrumları, basınç alanı haritası ve dağılım ilişkileri sonluelemanlar yöntemi ve Bloch teoremi kullanılarak hesaplandı. Bu yapı için maksimum bant aralığı 45°dönme açısında bulundu. Sayısal sonuçlar, bant aralıklarının kare çubukların dönüş açısını değiştirerekayarlanabileceğini göstermektedir.

Dispersion Features of Two-dimensional Phononic Crystal with Rotating Square Rods

In the present work, band structures of two-dimensional phononic crystals (PC) composed of squareshaped scaters in an air matrix with a square lattice are investigated. A two-dimensional phononiccrystal consisting of square LiNbO3 rods in an air matrix is considered for band structure calculations. Effects of orientations of square rods on the acoustic band gaps, transmission loss spectra, pressure field map and dispersion relations are calculated using the finite element method and Bloch theorem. The maximum acoustic band gaps for this structure is found at the rotation angle of 45°. The numerical results show that the band gaps can be tuned by changing the rotation angle of the square rods

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