Liftoff Dielectric Resonator for the Microwave Surface Resistance Measurement of Metal Plates

Hefford, Samuel; Clark, Nicholas; Gumbleton, Richard; Porch, Adrian

doi:10.1109/tim.2020.3040834

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…Resonant techniques are useful for determining the microwave surface resistance (Rs) of Yttrium Barium Copper Oxide (YBCO) superconductors, as demonstrated in multiple studies [41,42]. The methods entail incorporating a YBCO sample into various microwave resonators, such as dielectric resonators or open-ended coaxial resonators.…”

Section: Resonant Methodsmentioning

confidence: 99%

Review on Microwave Surface Resistance of High Temperature Superconductor Yttrium Barium Copper Oxide

Dahal,

Wang

2024

Preprint

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The performance of Yttrium-Barium Copper Oxide (YBCO) high-temperature superconductors in high-frequency applications is significantly affected by the microwave surface resistance (Rs). The paper delves into the basics, measuring methods and factors affecting the resistance (Rs) in YBCO, highlighting its high critical temperature (Tc) and low resistance, positioning it as a promising material. YBCO's compatibility with epitaxial growth and microstructure engineering offers opportunities to reduce grain boundary effects and improve Rs, making it advantageous for high-frequency electronics, communication systems, and MRI coils. This is due to its high critical current density (Jc) and exceptional Rs at practical temperatures. Challenges remain in comprehending and managing Rs in YBCO, despite its favorable characteristics. Utilizing advanced fabrication methods and incorporating nanotechnology allow for customization of YBCO-based devices. Multi-scale modeling and simulation are essential for guiding experimental work and understanding YBCO's performance in high-frequency settings. This study highlights the promise of YBCO for future high-frequency technologies and stresses the importance of more research to overcome hurdles and fully exploit its capabilities, potentially transforming superconducting devices for practical use.

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Section: Resonant Methodsmentioning

confidence: 99%

Review on Microwave Surface Resistance of High Temperature Superconductor Yttrium Barium Copper Oxide

Dahal,

Wang

2024

Preprint

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“…Since the MSR determines the metal power loss and the metal power loss is closely related to the quality factor of the microwave resonator, the MSR can be calculated based on the measurement of the quality factor of the resonator. At present, hollow resonant cavities [13][14][15] and dielectric resonators [16][17][18][19] are mainly used for the MSR measurement. For the former, part of the cavity wall is replaced with a metal under test (MUT), and the change in quality factor of the cavity before and after replacement can be used to extract the MSR of the MUT.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Measurement Technology for Microwave Surface Resistance of Metal Materials

Xie,

Zhang,

Niu

et al. 2023

International Journal of RF and Microwave Computer-Aided Engine

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The resonant cavity method is a commonly used method for high-temperature testing of the complex permittivity of dielectric materials. When a resonant cavity is used for high-temperature testing, the microwave surface resistance of the cavity metal material will deteriorate due to factors such as oxidation reaction and thermal fatigue, resulting in a decrease in testing accuracy and repeatability. Therefore, when designing a high-temperature resonant cavity, the temperature response characteristics of the microwave surface resistance of the cavity metal material should be obtained in advance. In this paper, a high-temperature measurement method of microwave surface resistance of metal materials based on a separate cylindrical resonator is proposed, a mathematical model of microwave surface resistance inversion based on the resonator quality factor is established, and a high-temperature measurement system of microwave surface resistance is integrated. The reliability of the proposed method and system is verified through simulation and experiment. The measurement frequency covers 7-18 GHz, and the maximum test temperature reaches 500°C. Systematic error of microwave surface resistance measurement at room temperature is less than 3%.

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“…Microwave devices and methods for thin films research are presented in the literature [38][39][40][41]. Such methods are quite accurate and easy to use, but many of them have drawbacks that lead to measurement errors.…”

Section: Introductionmentioning

confidence: 99%

Graphene passivation effect on copper cavity resonator preserves Q-factor

Nuriakhmetov

Chernousov²,

Sakhapov³

et al. 2023

Nanotechnology

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Proposed resonator design and measurement technique is a promising solution to estimate the value of materials surface conductivity. In the developed device, there are no mechanical connections, that interrupt the flowing microwave currents, which eliminates losses due to poor metal contact and related measurement errors. The main losses (60%) in the resonator are concentrated in a small sample under study - RES, which ensures high sensitivity to changes in surface conductivity. The influence of annealing the copper cavity resonator surface conducting microwave currents, as well as the effect of graphene coating on its intrinsic quality factor and frequency, was experimentally studied. Technological procedures for modifying a copper surface such as annealing in an H2/Ar atmosphere at a temperature of 1070°C and subsequent coating with graphene by chemical vapor deposition (CVD) method are studied. The modification of copper resonator surface texture during heat treatment in hydrogen and argon atmospheres has been studied. It is shown that during annealing, the resonator quality factor increases. The increase of the quality factor was associated with a decrease of resistance of copper, with the growth of crystalline grains, this effect disappears when the resonator is exposed to an air atmosphere. It was found that the graphene coating does not make a significant contribution to the change in the quality factor, but prevents the active growth of the oxide layer and prevents impurities deposition on the copper surface from the atmosphere. Thus, after annealing in hydrogen atmosphere and subsequent coating with graphene, the increased quality factor is retained. The considered procedures can be used to increase and stabilize the resonators quality factor, to eliminate oxidation and contamination of their surface. The results of this work can be used in the designing of microwave devices to study the thin films surface impedance.

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Liftoff Dielectric Resonator for the Microwave Surface Resistance Measurement of Metal Plates

Cited by 9 publications

References 23 publications

Review on Microwave Surface Resistance of High Temperature Superconductor Yttrium Barium Copper Oxide

Review on Microwave Surface Resistance of High Temperature Superconductor Yttrium Barium Copper Oxide

High-Temperature Measurement Technology for Microwave Surface Resistance of Metal Materials

Graphene passivation effect on copper cavity resonator preserves Q-factor

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