Quality factor and surface resistance of high-Tc superconductor thick film microstrip resonators

Tapani Kokkomaki; Alexander C. Bodi; Seppo Leppaevuori; Jukka Vaeyrynen

doi:10.1117/12.218167

1 September 1995 Quality factor and surface resistance of high-T_c superconductor thick film microstrip resonators

Tapani Kokkomaki, Alexander C. Bodi, Seppo Leppaevuori, Jukka Vaeyrynen

Proceedings Volume 2559, High-Temperature Microwave Superconductors and Applications; (1995) https://doi.org/10.1117/12.218167
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Quality factor and surface resistance of high-T_c superconductor thick film microstrip resonators have been studied at various cryogenic temperatures. Superconducting microstrip line resonators made of YBa₂Cu₃O_7-d (YBCO) material were prepared by screen printing on polycrystalline yttrium stabilized zirconium oxide substrates. Equivalent resonators mae of thick film gold material (ESL 8880-H) were prepared on the same substrate material to determine the resonator geometry factor (G) and by means of it the surface resistance (R_S) of the superconducting resonators. Both conductor patterns and ground planes of the superconducting resonators were made of YBCO material. The resonators were measured in the frequency range 2 GHz - 7 GHz and the temperature range 30 K - 90 K (the gold resonators were measured up to 300 K). At their best, the superconducting resonators showed significant improvement in unloaded quality factor Q₀ (over three times higher) and over 6 dB lower insertion loss values compared to identical thick film gold resonators at 40 K - 50 K temperatures. The crossover temperature was frequency dependent: for example, temperatures of 62 K at 2.3 GHz, 71 K at 4.6 GHz and 55 K at 6.8 GHz frequencies were observed. The surface resistance of the YBCO resonators was calculated at the fundamental, the second and the third harmonic resonant frequencies at 40 K and 77 K. To achieve significant improvement in loss characteristics over thick film gold resonators at these frequencies, operation near 40 K temperatures is required.

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Tapani Kokkomaki, Alexander C. Bodi, Seppo Leppaevuori, and Jukka Vaeyrynen "Quality factor and surface resistance of high-T_c superconductor thick film microstrip resonators", Proc. SPIE 2559, High-Temperature Microwave Superconductors and Applications, (1 September 1995); https://doi.org/10.1117/12.218167

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KEYWORDS

Resonators

Gold

Resistance

Superconductors

Temperature metrology

Microwave radiation

Printing

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