Microwave radiation and sensing of Josephson junction with the log-periodic toothed trapezoid antenna of high T(c) superconducting films

Using high temperature superconducting thin films, we designed and fabricated Josephson junctions associated with a log-periodic toothed trapezoid antenna. Microwave self-radiation from the Josephson junction was measured by using both a superheterodyne receiver at the center frequency of 22 GHz and...

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Published in:IEEE transactions on applied superconductivity 1999-06, Vol.9 (2), p.3074-3076
Main Authors: Kang, Kwang-Yong, Song, Insang, Ha, Yeon Su, Han, Seok-Kil, Sung, Gun Yong, Song, I-Hun, Park, Gwangseo
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container_title IEEE transactions on applied superconductivity
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Song, Insang
Ha, Yeon Su
Han, Seok-Kil
Sung, Gun Yong
Song, I-Hun
Park, Gwangseo
description Using high temperature superconducting thin films, we designed and fabricated Josephson junctions associated with a log-periodic toothed trapezoid antenna. Microwave self-radiation from the Josephson junction was measured by using both a superheterodyne receiver at the center frequency of 22 GHz and an external waveguide system. In the case of junction incorporated with an antenna structure, there was a significant increase of power by an order of magnitude with respect to a junction without antenna. Under the 22 GHz irradiation, we observed distinctive Shapiro steps in the I-V measurement, which allowed as estimating the received power of the junction. The received power of the junction with an antenna exhibited as a large increase as that of a self-radiation. Our results indicate that a Josephson junction with an antenna is very effective for the microwave coupling between Josephson junction and free space. The combined device can be used either for a high power microwave source or for a high sensitive sensor
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