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引用次数: 2
摘要
本文介绍了采用扇形idt的新型平衡SAW滤波器，在128°YX LiNbO3上降低了插入损耗，分数带宽为10-24%。这些滤波器采用扇形三换能器结构，其中包含一个输入IDT和两个带分裂电极的输出IDT。利用δ函数模型对声表面波滤波器的结构和拓扑进行了计算机仿真。在255、305 MHz采样下，SAW滤波器的3-dB带宽为30-61 MHz，插入损耗为5.5-7.5 dB，通带纹波约为3 dB，形状因子为1.28-1.5，阻带衰减超过40 dB。样品被安置在5×5×1.35 mm SMD封装中，可以在平衡/不平衡50-Ω系统中运行。
Balanced wide band fan-shaped three-tranducer SAW filters with reduced insertion loss and improved frequency response
This paper presents the new balanced SAW filters using fan-shaped IDTs with reduced insertion loss, a fractional bandwidth of 10-24% on 128°YX LiNbO3. The fan-shaped three-transducer structure containing one input IDT and two output IDTs with the split electrodes is used in these filters. The constructional and topological optimization of the SAW filters is provided with a computer simulation using an δ-function model. The 255, 305 MHz samples of the SAW filters have shown 3-dB bandwidth of 30-61 MHz, insertion loss of 5.5-7.5 dB, passband ripple of around 3 dB, shape factor of 1.28-1.5, stopband attenuation over 40 dB in a matched system. The samples were housed in the 5×5×1.35 mm SMD packages and could operate in balanced/unbalanced 50-Ω system.
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