Design and Implementation of ParallelIDT Surface.pdf

Design and Implementation of Parallel-IDT Surface Acoustic Waves (SAW) Low Loss RF Filters Hsu-Cheng Ou Mona Zaghloul The George Washington University The George Washington University Washington DC, USA Washington DC, USA hsucheng@ zaghloul@ Abstract鈥擨n this work, we study the design and implementation 124.75MHz.The relationship between the n harmonic of a parallel-IDT surface acoustic wave (SAW) filter for frequency and the first harmonic frequency is defined by the telecommunication applications. The equivalent circuit and 3D following equations. model are established to understand acoustoelectric interactions. 0 For the second harmonic wave length 饊寙 , The 128 Y-Z rotated LiNbO which has high electromechanical 2 3 coupling constant is used as the piezoelectric material to generate the acoustic waves. The single-IDT and parallel IDT 1 饊寙 = 1 饊寙 + 饊寙 飥 飥 飥€诧€╋€ 1 2 2 SAW filters were implemented in 122 MHz. The parallel-IDT 4 4 SAW filter has an Insertion Loss to -5.515dB, larger than the For the n harmonic wave length 饊寙飥 , single-IDT SAW filter.