Homogeneity in the Microwave Surface Resistance of Large YBa2Cu3O7−δ Superconductor Films Coated with Au

Yang, Woo Il; Lee, Sungho; Jung, Ho Sang; Kim, Hyerim; Lee, Sang Young

doi:10.1007/s13391-020-00212-5

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The strips had to be passivated against oxidation. Gold coating is frequently used to protect the superconducting layer [ 38 ]. However, electromagnetic interaction between the gold and the propagating microwaves may cause losses [ 39 , 40 , 41 ].…”

Section: Measurements and Resultsmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

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A new measurement technique of electrical parameters of superconducting thin films at the Very High Frequency (VHF) range is described, based on resonators with microstrip (MS) structures. The design of an optimal resonator was achieved, based on a thorough theoretical analysis, which is required for derivation of the exact configuration of the MS. A theoretical model is presented, from which an expression for the attenuation of a MS line can be derived. Accordingly, simulations were performed, and an optimal resonator for the VHF range was designed and implemented. Production constraints of YBa2Cu3O7 (YBCO) limited the diameter of the sapphire substrate to 3″. Therefore, a meander configuration was formed to fit the long λ/4 MS line on the wafer. By measuring the complex input reflection coefficients of a λ/4 resonator, we extracted the quality factor, which is mainly affected by the dielectric and conductor attenuations. The experimental results are well fitted by the theoretical model. The dielectric attenuation was calculated using the quasi-static analysis of the MS line. An identical copper resonator was produced and measured to compare the properties of the YBCO resonator in reference to the copper one. A quality factor of ~6·105 was calculated for the YBCO resonator, three orders of magnitude larger than that of the copper resonator. The attenuation per unit length of the YBCO layer was smaller by more than five orders of magnitude than that of the copper.

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Section: Measurements and Resultsmentioning

confidence: 99%

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

et al. 2021

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“…Both filters were placed inside an aluminum package (Figure 3). To form high-quality contacts, the tips of the filter feedlines were coated with gold (Figure 1) [29]. The SMA connectors were attached to these tips using an indium-silver alloy and silver paint.…”

Section: Filter Design Simulations Implementation and Packaging Optim...mentioning

confidence: 99%

Very Low-Noise Figure HTSC RF Front-End

et al. 2022

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A very low noise figure radio frequency (RF) front-end for the cellular realm is presented. The front-end is composed of two planar YBCO high critical temperature superconductor (HTSC) bandpass filters (BPFs) and a low temperature, low noise amplifier. Using advanced HTSC growth techniques, 8-pole hairpin BPFs are implemented in a YBCO thin film grown on both sides of a sapphire substrate. The front-end is designed and implemented based on the optimal configuration of the filters derived from advanced electromagnetic simulations. Measured performance at 77 K shows a high-frequency response and very low losses, with an insertion loss of 0.15 dB and a rejection ratio of −93 dBc. The integration of HTSC filters with the low noise amplifier results in a system with superior performance, with a low noise figure of around 0.5 dB. Low insertion loss and the compact dimensions of the filter, along with low total system noise, make the designed superconducting RF front-end highly attractive for radio receivers.

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RF and Microwave Applications of High Temperature Superconductors

Hannachi

Slimani

2022

Superconducting Materials

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Homogeneity in the Microwave Surface Resistance of Large YBa2Cu3O7−δ Superconductor Films Coated with Au

Cited by 4 publications

References 14 publications

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Very Low-Noise Figure HTSC RF Front-End

RF and Microwave Applications of High Temperature Superconductors

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