A Tunable subTHz Source Based on the Josephson Oscillator with Phase Locking

We present a new implementation for a sub-terahertz and terahertz source based on a superconducting Josephson flux-flow oscillator. The oscillator has been integrated with the transmitting antenna on a single chip providing the emission to open space, and with a harmonic mixer based on a superconductor-insulator-superconductor junction for a frequency and phase locking. We have used the double slot antenna to couple the oscillator output planar transmission line with the open space; the antenna is additionally matched to the elliptical silicon lens forming narrow output beam of subTHz radiation. The design of antenna and matching structures coupled to the oscillator has been developed and fabricated, the operating range 0.25 - 0.45 THz has been obtained experimentally.