High-Temperature Superconducting Spiral Resonator for Metamaterial Applications

TL;DR

This paper investigates high-temperature superconducting spiral resonators for RF/microwave metamaterials, analyzing their resonance mechanisms, mode behaviors, and temperature effects through theoretical models and experimental validation.

Contribution

It provides a detailed theoretical and experimental study of superconducting spiral resonators, highlighting their potential for metamaterial applications and analyzing mode and temperature dependencies.

Findings

Resonance quality factor depends on mode parity.

Experimental data validates the theoretical models.

Resonance characteristics evolve with temperature and RF power.

Abstract

This work studies high-temperature superconducting spiral resonators as a viable candidate for realization of RF/microwave metamaterial atoms. The theory of superconducting spiral resonators will be discussed in detail, including the mechanism of resonance, the origin of higher order modes, the analytical framework for their determination, the effects of coupling scheme, and the dependence of the resonance quality factor and insertion loss on the parity of the mode. All the aforementioned models are compared with the experimental data from a micro-fabricated YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) spiral resonator. Moreover, the evolution of the resonance characteristics for the fundamental mode with variation of the operating temperature and applied RF power is experimentally examined, and its implications for metamaterial applications are addressed.