Superconducting Sub-Terahertz Oscillator with Continuous Frequency Tuning

The development and approbation of a superconducting local oscillator based on long Josephson junction made it possible to create fully integrated receiver in sub-terahertz frequency range, which was successfully tested both board high-altitude balloon the laboratory. In order expand range oscillator, is necessary ensure continuous tuning its at an arbitrary bias current, including so-called resonant mode regime. regime takes place for high-quality tunnel junctions with low leakage; this regime, stable generation only Fiske steps, distance between tens GHz. A method suppressing resonances has been proposed implemented; introduction normal metal layers into region near junction. Modeling propagation electromagnetic waves structure carried out; experimental samples were fabricated, their comprehensive study performed. complete suppression possibility 200–700 GHz have demonstrated. linewidth FFO radiation does not exceed 15 MHz over entire makes implement phase locked loop intended spectral studies.