Digital non-Foster-inspired electronics for broadband impedance matching

Xin Yang (), Zhihe Zhang, Mengwei Xu, Shuxun Li, Yuanhong Zhang, Xue-Feng Zhu (), Xiaoping Ouyang () and Andrea Alù ()
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Xin Yang: Hunan University
Zhihe Zhang: Hunan University
Mengwei Xu: Hunan University
Shuxun Li: Hunan University
Yuanhong Zhang: Hunan University
Xue-Feng Zhu: Huazhong University of Science and Technology
Xiaoping Ouyang: Xiangtan University
Andrea Alù: City University of New York

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Narrow bandwidths are a general bottleneck for applications relying on passive, linear, subwavelength resonators. In the past decades, several efforts have been devoted to overcoming this challenge, broadening the bandwidth of small resonators by the means of analog non-Foster matching networks for radiators, antennas and metamaterials. However, most non-Foster approaches present challenges in terms of tunability, stability and power limitations. Here, by tuning a subwavelength acoustic transducer with digital non-Foster-inspired electronics, we demonstrate five-fold bandwidth enhancement compared to conventional analog non-Foster matching. Long-distance transmission over airborne acoustic channels, with approximately three orders of magnitude increase in power level, validates the performance of the proposed approach. We also demonstrate convenient reconfigurability of our non-Foster-inspired electronics. This implementation provides a viable solution to enhance the bandwidth of sub-wavelength resonance-based systems, extendable to the electromagnetic domain, and enables the practical implementation of airborne and underwater acoustic radiators.

Date: 2024
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DOI: 10.1038/s41467-024-48861-6

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