{"title":"Ascertaining Operating Points of Harmonic Transponders Using Intermodulation Responses","authors":"Jeff Frolik;Elsie Anthonio;Rye Fought;Tara Harte","doi":"10.1109/OJAP.2024.3445300","DOIUrl":null,"url":null,"abstract":"Harmonic transponders are nonlinear, passive devices that typically receive an interrogation signal at one single frequency and reradiate harmonics. In this work, we propose leveraging the device’s nonlinearity by interrogating with two closely spaced signals and then measuring the second harmonics and nearby second and fourth intermodulation distortion products. Our results show that we are able to remotely determine the power incident at the device, over a 25 dB range and within ±1 dB, using only the relative ratios between these received components. This result has applications in characterizing the loss of unknown channels and in conducting over-the-air characterization of fully integrated transponders. We demonstrate this latter application.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10638145","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Open Journal of Antennas and Propagation","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10638145/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Harmonic transponders are nonlinear, passive devices that typically receive an interrogation signal at one single frequency and reradiate harmonics. In this work, we propose leveraging the device’s nonlinearity by interrogating with two closely spaced signals and then measuring the second harmonics and nearby second and fourth intermodulation distortion products. Our results show that we are able to remotely determine the power incident at the device, over a 25 dB range and within ±1 dB, using only the relative ratios between these received components. This result has applications in characterizing the loss of unknown channels and in conducting over-the-air characterization of fully integrated transponders. We demonstrate this latter application.
谐波转发器是一种非线性、无源设备,通常接收单一频率的询问信号,并重新辐射谐波。在这项工作中,我们建议利用该设备的非线性特性,使用两个间隔很近的信号进行询问,然后测量二次谐波以及附近的二次和四次互调失真产物。我们的研究结果表明,只需利用这些接收分量之间的相对比率,我们就能在 25 dB 的范围内远程确定设备的入射功率,且误差不超过 ±1dB。这一结果可用于鉴定未知信道的损耗和对全集成转发器进行空中鉴定。我们演示了后一种应用。