21 May 2024 | Xin Yang, Zhihe Zhang, Mengwei Xu, Shuxun Li, Yuanhong Zhang, Xue-Feng Zhu, Xiaoping Ouyang, Andrea Alù
This paper presents a novel approach to broadband impedance matching in subwavelength resonators, inspired by digital non-Foster electronics. Traditional analog non-Foster circuits have limitations in tunability, stability, and power handling, which hinder their application in various systems. The authors demonstrate a five-fold increase in bandwidth compared to conventional analog non-Foster matching by using digital non-Foster-inspired electronics. This approach leverages digital control techniques and switch-mode electronics to synthesize equivalent negative resistance, inductance, and capacitance with desired frequency dispersion (FD). The digital non-Foster-inspired electronics enable real-time tunability and robust reconfigurability, overcoming the limitations of analog circuits. Experimental results show that the proposed system can support high-power acoustic radiation over long distances, validating its stability, reconfigurability, and real-time tunability. The technique is also applied to image transmission over airborne acoustic channels, demonstrating its practicality and potential for enhancing the bandwidth, power, and agility of sub-wavelength resonance-based systems.This paper presents a novel approach to broadband impedance matching in subwavelength resonators, inspired by digital non-Foster electronics. Traditional analog non-Foster circuits have limitations in tunability, stability, and power handling, which hinder their application in various systems. The authors demonstrate a five-fold increase in bandwidth compared to conventional analog non-Foster matching by using digital non-Foster-inspired electronics. This approach leverages digital control techniques and switch-mode electronics to synthesize equivalent negative resistance, inductance, and capacitance with desired frequency dispersion (FD). The digital non-Foster-inspired electronics enable real-time tunability and robust reconfigurability, overcoming the limitations of analog circuits. Experimental results show that the proposed system can support high-power acoustic radiation over long distances, validating its stability, reconfigurability, and real-time tunability. The technique is also applied to image transmission over airborne acoustic channels, demonstrating its practicality and potential for enhancing the bandwidth, power, and agility of sub-wavelength resonance-based systems.