Design of HTS Distributed Two-Dimensional Devices
NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES(2001)
摘要
The advent of high-temperature superconducting (HTS) materials has enabled a number of important applications in passive microwave
electronics. Superconductors exhibit very low electrical losses at microwave frequencies and, although finite, at the practical
operating temperature of 77 K (boiling point of liquid nitrogen at atmospheric pressure), these losses are more than two orders
of magnitude lower than that of normal conductors at frequencies of 10 GHz and below. This has opened the possibility for
high-performance planar microwave components since high-quality epitaxial films can be deposited on both sides of low microwave
loss, single-crystal substrates, allowing the fabrication of components in planar configurations such as microstrip, stripline
and coplanar waveguide. These configurations are widely used throughout the microwave community in a variety of technologies
ranging from GaAs microwave monolithic integrated circuits (MMIC) to integrated circuits using ceramic and laminated substrates.
Figure 1 shows a schematic cross section of these three common planar microwave structures. The use of HTS in these circuit configurations
results in passive devices such
Figure 1. HTS technology can be used to the fabrication of microwave planar devices such as those schematically depicted here in cross
section. One advantage of coplanar waveguide (and its variant slot-line, not shown ) is that only one HIS film is needed to
make a device. One disadvantage of stripline is that it is difficult to package. HIS devices have been demonstrated in all
three structures
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关键词
hts,two-dimensional
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