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High-temperature superconducting multi-band radio-frequency metamaterial atoms
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Image of FIG. 1.
FIG. 1.

SEM images of a 6 mm-diameter YBCO spiral resonator with 40 turns of 10 μm-wide lines and 10 μm spacing.

Image of FIG. 2.
FIG. 2.

Schematic of the measurement setup. The loop antennas are connected to a RF network analyzer at room temperature, while the cold finger is connected to a Gifford-McMahan cryocooler.

Image of FIG. 3.
FIG. 3.

The measured transmission spectrum of the YBCO spiral resonator. Top: ten resonant modes exist below 1 GHz, each with potential to create negative effective permeability. Bottom: the close up view of the third resonance at different temperatures.

Image of FIG. 4.
FIG. 4.

The effect of substrate dielectric constant on the resonance frequency of the fundamental mode. The solid line shows the experimental resonance of the YBCO spiral on sapphire substrate and the dashed lines are the results of HFSS simulation of a perfect metal spiral of the same geometry with varying dielectric constant in the substrate.


Generic image for table
Table I.

The experimental resonance characteristics of the low-order modes below 1 GHz for the YBCO spiral resonator at 10 K with different substrates.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-temperature superconducting multi-band radio-frequency metamaterial atoms