Title :
Resonances in two-dimensional array oscillator circuits
Author :
Booi, P.A.A. ; Benz, S.P.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
We present experimental results on the emission from phase-locked two-dimensional arrays of Josephson junctions. We have coupled the emission from 10/spl times/10 arrays to a room-temperature mixer through a fin-line antenna and WR-12 waveguide. A single voltage-tunable peak was detected up to 230 GHz. A stripline resonance in antenna reduced the array´s dynamic resistance and thereby the emission linewidth to as low as 10 kHz. We extract an effective noise temperature of 14 K from the linewidth data. When the array´s emission was coupled to an on-chip detector junction through a dc blocking capacitor, we detected voltage-tunable emission from 75 GHz up to 300 GHz, and in some circuits emission above 400 GHz. Here, the coherent power spectrum depends on internal resonances.<>
Keywords :
Josephson effect; fin line components; millimetre wave oscillators; phase locked oscillators; superconducting microwave devices; voltage-controlled oscillators; 75 to 300 GHz; Josephson junctions; WR-12 waveguide; coherent power spectrum; dynamic resistance; effective noise temperature; emission linewidth; fin-line antenna; internal resonances; on-chip detector junction; phase-locked two-dimensional arrays; room-temperature mixer; stripline resonance; two-dimensional array oscillator circuits; voltage-tunable peak; Antenna arrays; Coupling circuits; Finline; Josephson junctions; Oscillators; Phased arrays; RLC circuits; Resonance; Stripline; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on