Low-Loss and Wideband Acoustic Delay Lines
Low-Loss and Wideband Acoustic Delay Lines
复制标题
低损耗宽带声学延迟线
DOI：
10.1109/tmtt.2019.2900246
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发表时间：
2019
影响因子：
4.3
通讯作者：
S. Gong
中科院分区：
文献类型：
--
作者：
T. Manzaneque;Ruochen Lu;Yansong Yang;S. Gong
本文首次基于薄膜linbo3中的剪切 - 霍尼特波，证明了低损失的声学延迟线（ADL）。由于其较高的机电耦合，剪切 - 旋转模式适用于生产具有较大带宽的设备。在这里，我们表明Linbo3薄膜中的剪切 - 霍尼龙波也非常适合基于单向传感器实现低损失ADL。 linbo3薄膜上电极的机械负载引起的高声反射和大型传感器的单向性，在延迟线插入损耗和带宽之间提供了巨大的权衡。已经表征了两种不同类型的单向传感器的方向性。已经设计，制造和测量了关键设计参数的延迟线。我们制造的设备之一显示，在以160 MHz为中心的3 dB带宽下，IL低于2 dB的IL延迟为75 ns（分数带宽= 10％）。分析了其他延迟和不同数量的换能细胞的其他设备的测量插入损失，并讨论了损失因素及其可能的缓解因素。
This paper demonstrates low-loss acoustic delay lines (ADLs) based on shear-horizontal waves in thin-film LiNbO3 for the first time. Due to its high electromechanical coupling, the shear-horizontal mode is suited for producing devices with large bandwidths. Here, we show that shear-horizontal waves in LiNbO3 thin films are also excellent for implementing low-loss ADLs based on unidirectional transducers. The high acoustic reflections and large transducer unidirectionality induced by the mechanical loading of the electrodes on a LiNbO3 thin film provide a great tradeoff between delay line insertion loss and bandwidth. The directionality for two different types of unidirectional transducers has been characterized. Delay lines with variations in the key design parameters have been designed, fabricated, and measured. One of our fabricated devices has shown a group delay of 75 ns with an IL below 2 dB over a 3-dB bandwidth of 16 MHz centered at 160 MHz (fractional bandwidth = 10%). The measured insertion loss for other devices with longer delays and different numbers of transducer cells are analyzed, and the loss contributing factors and their possible mitigation are discussed.
影响因子：
16.6
作者：
Dinc T;Tymchenko M;Nagulu A;Sounas D;Alu A;Krishnaswamy H
通讯作者：
Krishnaswamy H