Nonlinear RF spurious in a cylindrical cavity with superconducting endplates
We have developed a method to calculate the distribution of fundamental and spurious fields in a metallic cylindrical cavity with superconducting endplates in which signals at two different frequencies are injected. The nonlinearity in the superconductor produces the typical intermodulation effects...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2002 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/1122 |
| Acceso en línea: | https://hdl.handle.net/2117/1122 |
| Access Level: | acceso abierto |
| Palabra clave: | High temperature superconductors Microwave measurements Cavity resonators high-temperature superconductors intermodulation distortion microwave measurement superconducting cavity resonators nonlinear RF spurious superconducting endplates spurious fields metallic cylindrical cavity superconducting endplates signals nonlinearity intermodulation effects injected signals frequencies resonant mode harmonic balance nonlinear models nondestructive procedure nonlinear parameters HTS RF measurements propagating mode square-law nonlinearities harmonic balance calculation Superconductors a altes temperatures Microones -- Mesurament Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques |
| Sumario: | We have developed a method to calculate the distribution of fundamental and spurious fields in a metallic cylindrical cavity with superconducting endplates in which signals at two different frequencies are injected. The nonlinearity in the superconductor produces the typical intermodulation effects if the frequencies of the injected signals are sufficiently close to each other and near a resonant mode. Our method uses harmonic balance to match the fields in the cavity with the currents on the endplates. The method can be used for a variety of nonlinear models of the superconducting endplate, and could be the base for a nondestructive procedure to extract the nonlinear parameters of an HTS sample from RF measurements. Our analysis is restricted to the TE011 mode, but the method can be applied to any propagating mode in the cylindrical cavity. Closed-form equations for the case of square-law nonlinearities in the superconductor are derived and used to check the validity of the harmonic balance calculation. |
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