Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 32, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/ab4c1d
Keywords
tunable superconducting resonator; variable superconducting electrode capacitor; wireless power transfer
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Funding
- Fundamental Research Funds for the Central Universities [2019XJ01]
- National Natural Science Foundation of China [U1834203]
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The frequency alignment of resonators is essential for wireless power transfer (WPT) systems to achieve strongly coupled magnetic resonances. Here, we present a novel tunable superconducting resonator for WPT applications. The tunable resonator is composed of a high-temperature superconducting (HTS) coil and a variable HTS electrode capacitor bank based on two series YBa2C3O7-x-SrTiO3-YBa2C3O7-x thin films. The HTS coil serves as a wireless transmitting tool for power delivery, while the HTS electrode capacitor bank provides a frequency-tuning element for the resonator. At 77 K, the HTS materials cause low loss and thus achieve a high quality factor, while the incipient ferroelectric SrTiO3 substrate with HTS electrodes has a nonlinear capacitance dependence on the applied electric field with no hysteresis. A voltage supply applies a continuous DC bias to both capacitors synchronously via the coil, adjusting the total capacitance and thus the resonant frequency. Our results indicate that the tunable resonator can achieve a tuning range of 12% from 775 kHz, offering a frequency-tuning functionality to superconducting WPT technology.
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