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The Japan Society of Applied Physics

Evaluations of kinetic inductance in YBCO coplanar waveguide

Takashi Goto, Masanori Takeda, Hisashi Shimakage

Published Jul 21, 2017• 0 citations
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Abstract We measured the microwave transmission characteristics of coplanar waveguides (CPWs) fabricated using YBa2Cu3O7−δ (YBCO) thin films with DC current biases. Kinetic inductances ( L K ) and nonlinear parameters ( I * ) were evaluated for CPWs with film thicknesses of 20, 50, and 200 nm. The results indicate that the experimental values closely follow the second-order nonlinearity exhibited by the L K . To operate as a superconducting parametric amplifier with a standard gain of 20 dB and a pump power of −10 dBm, we introduced a step-impedance structure into the transmission line. As a result, when using an MgO substrate, the required line length was estimated to be approximately 1.25 m, corresponding to approximately 29 times the wavelength of the CPW.

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Current Distribution and Kinetic Inductance of Coplanar Waveguide Transmission Lines

Mohammad Hossein Amini, Zahra Davoodi-Rad, Amirhossein Ghasemi +2 more

Analysis of superconducting circuits requires knowledge of current density distribution in the film cross section. This article aims to investigate the current density distribution in superconducting coplanar waveguides (SCPWs), a basic component with increasing use in microwave integrated circuits. In this regard, first, the CPW is mapped to a pair of parallel plates and the vector potential is described through the Green's function concept. Then, based on the Green's function and utilizing London's second equation, an integral equation is formed which yields the current density distribution. The procedure is verified by COMSOL Multiphysics software. Examining the current density for several SCPWs shows that as the gap is reduced, the SCPW experiences much more current density especially at the edges. Based on the proposed procedure, the kinetic inductance of SCPW is examined, which is another focus of the article. In this article, for several CPWs with different aspect ratios, the kinetic inductance is evaluated and discussed. Results show that as the ratio is increased, the kinetic inductance is decreased.

IEEE Transactions on Applied Superconductivity•Sep 2, 2022•4 citations
Abstract We measured the microwave transmission characteristics of coplanar waveguides (CPWs) fabricated using YBa2Cu3O7−δ (YBCO) thin films with DC current biases. Kinetic inductances ( L K ) and nonlinear parameters ( I * ) were evaluated for CPWs with film thicknesses of 20, 50, and 200 nm. The results indicate that the experimental values closely follow the second-order nonlinearity exhibited by the L K . To operate as a superconducting parametric amplifier with a standard gain of 20 dB and a pump power of −10 dBm, we introduced a step-impedance structure into the transmission line. As a result, when using an MgO substrate, the required line length was estimated to be approximately 1.25 m, corresponding to approximately 29 times the wavelength of the CPW.
Analysis of superconducting circuits requires knowledge of current density distribution in the film cross section. This article aims to investigate the current density distribution in superconducting coplanar waveguides (SCPWs), a basic component with increasing use in microwave integrated circuits. In this regard, first, the CPW is mapped to a pair of parallel plates and the vector potential is described through the Green's function concept. Then, based on the Green's function and utilizing London's second equation, an integral equation is formed which yields the current density distribution. The procedure is verified by COMSOL Multiphysics software. Examining the current density for several SCPWs shows that as the gap is reduced, the SCPW experiences much more current density especially at the edges. Based on the proposed procedure, the kinetic inductance of SCPW is examined, which is another focus of the article. In this article, for several CPWs with different aspect ratios, the kinetic inductance is evaluated and discussed. Results show that as the ratio is increased, the kinetic inductance is decreased.