We present the conceptual approach, theoretical simulations, and experimental results of a novel device based on acoustic delay lines with different pitch between transmitter and receiver (dubbed pitch-asymmetric delay lines) for passive voltage amplification of radio frequency signals. The theoretical results show that it is possible to attain very high voltage gains in this new class of asymmetrical delay lines. The experimental results validate the ability to produce voltage gain, but significantly below theoretical predictions. We attribute this discrepancy to the high admittance at the nulls of the experimental response of the interdigital transducers. We investigate the maximum admittance at the nulls compatible with obtaining high voltage gains ( $>20~dB$ ) and find that it is two order of magnitude lower than that achieved in this work. [2019-0209]

中文翻译：

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具有音高不对称声延迟线的射频信号的电压放大

我们介绍了一种基于发射器和接收器之间具有不同间距的声延迟线（称为间距不对称延迟线）的新型器件的概念方法、理论模拟和实验结果，用于射频信号的无源电压放大。理论结果表明，在这种新型非对称延迟线中可以获得非常高的电压增益。实验结果验证了产生电压增益的能力，但明显低于理论预测。我们将这种差异归因于叉指换能器实验响应的零点处的高导纳。我们研究了与获得高电压增益 ($>20~dB$) 兼容的零点处的最大导纳，发现它比这项工作中实现的低两个数量级。