Abstract
We designed and fabricated HTS 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 integrated with an antenna, there was a significant increase of power by an order of magnitude in compared to a junction without antenna. Under the 22 GHz irradiation, we observed distinctive Shapiro steps in the I-V measurement and estimated the received power of the junction. Since the received power of the Josephson junctions with an antenna exhibited as a large increase as that of a self-radiation, The HTS Josephson junctions with an antenna are very effective for the microwave coupling between Josephson junction and free space. The combined devices can be used both for a high power microwave source and for a high sensitive sensor.
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