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  • Solid-State Physics  (1)
  • high temperature superconductor  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetically Tunable Microwave Filters based on YBCO/YIG/GGG Heterostructures (2000)
    Springer
    Journal of electroceramics 4 (2000), S. 305-310 
    Details
    ISSN: 1573-8663
    Keywords: high temperature superconductor ; microwave filter ; magnetically tunable ; yttrium iron garnet ; pulsed laser deposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Superconducting, monolithic magnetically tunable microwave filters have been designed and fabricated demonstrating high tuning ranges (up to 19%) at a center frequency of 10 GHz. These filters are based on fully epitaxial YBa2Cu3O7 (YBCO) thin films grown by pulsed laser deposition onto liquid-phase epitaxy yttrium iron garnet (YIG) layers on gadolinium iron garnet (GGG) substrates. Mechanisms resulting in variations of the bandwidth and insertion losses upon tuning are analyzed and understood in terms of the material properties of YIG and GGG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009902306806
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    Paper (German National Licenses)
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  • 2
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    Perovskite Superlattices as Tunable Microwave Devices (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Experiments have shown that superlattices that comprise alternating epitaxial layers of dissimilar paraelectric perovskites can exhibit large changes in permittivity with the application of electric fields. The superlattices are potentially useful as electrically tunable dielectric components of such microwave devices as filters and phase shifters. The present superlattice approach differs fundamentally from the prior use of homogeneous, isotropic mixtures of base materials and dopants. A superlattice can comprise layers of two or more perovskites in any suitable sequence (e.g., ABAB..., ABCDABCD..., ABACABACA...). Even though a single layer of one of the perovskites by itself is not tunable, the compositions and sequence of the layers can be chosen so that (1) the superlattice exhibits low microwave loss and (2) the interfacial interaction between at least two of the perovskites in the superlattice renders either the entire superlattice or else at least one of the perovskites tunable.
    Keywords: Solid-State Physics
    Type: LEW-16938 , NASA Tech Briefs, May 2003; 13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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