Design and Characterization of High Quality-Factor Inductors for Wireless Systems Compatible With Flexible Large-Area Electronics

IEEE Journal on Flexible Electronics Pub Date : 2024-03-21 DOI:10.1109/JFLEX.2024.3379975

Yue Ma;Sigurd Wagner;Naveen Verma;James C. Sturm

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Abstract

Resonant operation, exploiting high quality-factor planar inductors, has recently enabled gigahertz (GHz) applications for large-area electronics (LAE), providing a new technology platform for large-scale and flexible wireless systems. This work first presents the design, analysis, and characterization methodology of flex-compatible large-area planar inductors. Specifically, three distinct radio frequency (RF) inductor characterization methods are experimentally demonstrated and compared, with the most accurate method among them (i.e.,

$S$

-parameters in a two-port configuration) demonstrating a record-high quality factor of up to

$\sim 65$

in the 2.4-GHz frequency band. Enabled by accurate characterization, key inductor design considerations regarding the resistive loss due to inductor’s metal traces are then discussed. Finally, a case study of the recently demonstrated LAE resonant switch shows the potential of these high-performance inductors towards large-area and conformal wireless systems for integrated Internet of Things (IoT) and 5G/6G applications.

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设计和表征与柔性大面积电子设备兼容的无线系统用高品质因数电感器

最近，利用高品质因数平面电感器的谐振操作为大面积电子设备（LAE）带来了千兆赫（GHz）应用，为大规模灵活无线系统提供了新的技术平台。这项研究首先介绍了柔性兼容大面积平面电感器的设计、分析和表征方法。具体而言，通过实验演示和比较了三种不同的射频（RF）电感器表征方法，其中最精确的方法（即双端口配置中的$S$参数）在2.4-GHz频段的品质因数高达$\sim 65$，创历史新高。通过精确的特性分析，我们讨论了电感器设计中有关电感器金属迹线电阻损耗的关键因素。最后，对最近展示的 LAE 谐振开关进行了案例研究，展示了这些高性能电感器在集成物联网 (IoT) 和 5G/6G 应用的大面积和保形无线系统方面的潜力。

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IEEE Journal on Flexible Electronics

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