Title :
190-GHz radiation from a quasioptical Josephson junction array
Author :
Wengler, Michael J. ; Guan, Boran ; Track, Elie K.
Author_Institution :
Dept. of Electr. Eng., Rochester Univ., NY, USA
fDate :
4/1/1995 12:00:00 AM
Abstract :
At 190 GHz, 0.36 μW has been detected from an 11×58 array of niobium Josephson junctions. The power is radiated directly into free space above the surface of the two-dimensional array of junctions. Detection is made by a commercial bolometer outside the array cryostat. The junctions in the array are closely spaced in the y-dimension, but spaced by more than one-half wavelength in the x-direction. This asymmetry results in mutual phase-locking between adjacent junctions suitable for the production of y-polarized radiation. The resonance anti asymmetry also results in a reasonable impedance match between the Josephson junctions and the free-space radiation mode
Keywords :
millimetre wave oscillators; niobium; phase locked oscillators; superconductor-insulator-superconductor devices; tunnel diode oscillators; 0.36 muW; 190 GHz; Nb; QIO; adjacent junctions; bolometer detection; mutual phase-locking; quasioptical Josephson junction array; quasioptical Josephson oscillator; resonance anti asymmetry; two-dimensional array; y-polarized radiation; Bolometers; Coupling circuits; Frequency; Impedance; Josephson junctions; Niobium; Oscillators; Production; Resonance; Superconducting microwave devices;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
