Abstract
Technological features of the process of manufacturing a high-speed high-temperature superconducting microstrip protective device which can reduce in a picosecond period (the time of switching or operation speed) the incoming power from the antenna-feeder path and the power passing through it to a level safe for sensitive semiconductor elements of the receiver (preventing current destruction of p-n junction). The study enables determination of the features and conditions for the use of modern technological methods for creating a superconducting microstrip protective device taking into account influence of the substrate material, superconductor and contacts and the method of their connection on the switching properties of superconducting films of the proposed protective device. The switching properties of superconducting films include speed of phase transition of a film from a superconducting to a nonconducting state. To determine degree of material influence on switching properties, it was proposed to use the following: lattice parameter, thermal expansion coefficient of materials, degree of interaction of molecular structures of the contacting surfaces, probability of local defects on the surface (nonconducting zones). The study outlines basic conditions (methods of film deposition, applying a certain superconducting film (YBCO) on the chosen substrate) which should be met in order to create an operable protective device. The study results make it possible to assess the degree of influence of contact materials and the method of deposition (of both film on the substrate and contacts on the film) on microstructure and switching properties of the superconducting protective device. Such results can be used in synthesis of high-temperature superconducting devices for protecting receiver elements from current destruction of their p–n junctions
Highlights
The YBCO compound with critical temperature above 93 K, higher than temperature of liquid nitrogen (77 K), was synthesized in 1987
Cheapness and simplicity of cooling the new superconductive materials with liquid nitrogen compared with liquid helium predetermined development of the lines of applied studies aimed at the use of superconductivity in technology, medicine, biology, etc. [1,2,3]
– necessary electromagnetically resistant high-temperature superconductors (HTSC) maneers were facing technological problems in introduction terials and substrates compatible by their crystal lattice of HTSC structures ranging from creation of defect-free structure and thermal expansion coefficient
Summary
The YBCO compound with critical temperature above 93 K, higher than temperature of liquid nitrogen (77 K), was synthesized in 1987. – necessary electromagnetically resistant HTSC maneers were facing technological problems in introduction terials and substrates compatible by their crystal lattice of HTSC structures ranging from creation of defect-free structure and thermal expansion coefficient Such problems slowed down the protection is established); process of introduction of HTSC structures, . Each HTSC separate analysis in order to select technological approachdevice requires an individual approach, both to the choice of es (choice of materials for HTSC films, substrates, low-remanufacturing technology and composition and the choice sistance contacts and the packaging method) for creating a of materials with a compatible crystal lattice structure superconducting microstrip film protective device [1] takwhich is determined by specific destination of devices as well ing into account conditions of its operation in SHF devices as peculiarities of their operating conditions.
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