高温超伝導材料のマイクロ波素子応用

概要

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One of the first applications of high-temperature superconductors (HTS) will be in high-performance microwave devices, especially in satrellite communications systems. This is because their surface resistance is more than two orders of magnitude lower than that of normal metals at microwave frequencies. When HTS microwave devices, such as filters, low-noise amplifiers, and local oscillators, are used in the transponders of mobile communication satellites, the mass and power consumption are expected to be as much as 30% less than in conventional systems, owing to the low loss and low noise characteristics of the HTS devices. HTS microstrip 9.5-GHz band-pass filters were fabricated with a fractional bandwidth of 2%, using doublesided YBa_2Cu_3O_x films. These filters show very low insertion loss of less than 0.1dB and consequently have a large unloaded Q factor of greater than 10, 000. Their power-handing capability is limited by the nonlinearity of HTS films at high input power levels, but it will be improved by studying the HTS film quality and filter structure.
社団法人日本磁気学会の論文
1998-06-01