Millimeter Wave Generation Using Josephson Junction Arrays

摘要

Studies have been carried out to develop methods to couple Josephson junction oscillators at frequencies near 100GHz so as to demonstrate the feasibility of Josephson effect sources of reasonable power and impedance. Phase-locking of junctions separated by greater than a wavelength and coupled through microstrip line has been demonstrated and found in accord with theory. Forty junction arrays operating at 100GHz and 350GHz using this phase-locking scheme have been tested. Both series and parallel biasing of the junctions have been tested. It has been established that a total critical current spread of less than 10% is required for complete phase-locking with series bias. For parallel biased arrays with a critical current spread of 20%, all junctions locked in-phase providing coherent addition of power to the 20 Ohm load. (rh)