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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Gigahertz Low-Loss and Wideband S0 Mode Lithium Niobate Acoustic Delay Lines
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Gigahertz Low-Loss and Wideband S0 Mode Lithium Niobate Acoustic Delay Lines

机译：千兆赫兹低损耗和宽带S0模式铌酸锂声学延迟线

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摘要

We present the first group of gigahertz S0 mode low loss and wideband acoustic delay lines (ADLs). The ADLs use a single- phase unidirectional transducers (SPUDT) design to launch and propagate the S0 mode in an X-cut lithium niobate thin film with large electromechanical coupling and low damping. In this work, the theoretical performance bounds of S0 mode ADLs are first investigated, significantly surpassing those in state-of-the-art. The design tradeoffs of S0 mode ADLs, when scaled to the gigahertz frequency range, are also discussed. The fabricated miniature ADLs show a fractional bandwidth (FBW) of 4% and a minimum insertion loss (IL) of 3.2 dB, outperforming the incumbent surface acoustic wave (SAW) counterparts, and covering a wide range of delays from 20 to 900 ns for digitally addressable delay synthesis. Multiple ADLs with center frequencies from 0.9 to 2 GHz have been demonstrated, underscoring their great frequency scalability. The propagation properties of S0 waves in lithium niobate at the gigahertz range are experimentally extracted. The demonstrated ADLs can potentially enable widerange and high- resolution delay synthesis that is highly sought after for the self- interference cancellation in full- duplex radios.
机译：我们介绍了第一组千兆赫S0模式低损耗和宽带声学延迟线（ADL）。 ADL使用单相单向换能器（SPUDT）设计来在具有大型机电耦合和低阻尼的X切割铌酸锂薄膜中发射和传播S0模式。在这项工作中，首先研究了S0模式ADL的理论性能界限，大大超出了现有技术水平。还讨论了S0模式ADL在按千兆赫兹频率范围缩放时的设计折衷。制成的微型ADL的分数带宽（FBW）为4％，最小插入损耗（IL）为3.2 dB，优于现有的表面声波（SAW）同类产品，并涵盖了从20到900 ns的宽范围延迟数字可寻址延迟合成。已经演示了中心频率为0.9至2 GHz的多个ADL，突出了其出色的频率可扩展性。实验提取了千兆赫范围内铌酸锂中S0波的传播特性。所展示的ADL可以潜在地实现宽范围和高分辨率的延迟合成，这对于全双工无线电中的自干扰消除是非常需要的。

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