Self-radiation phenomena in LTSC and HTSC bridges

The nonlinear properties of Nb-Si-Nb high-quality edge-junctions and Y-Ba-Cu-O thin-film bridges were examined at several frequencies: f approximately=1.7, 21, and 39 GHz at T=4.2 K by means of the highly sensitive radiometric probe method. The results of self-pumping mixing regime in a single edge-junction and phase-locking processes in an array of 21 junctions are presented. The HTSC (high-temperature superconducting) bridge has exhibited strong generation intensity, more than 300 times higher than single edge-junctions, and stimulation of self-radiation under external microwave affection.