Phase-locked oscillator at 3 mm waveband using high Tc superconductor mixer mounted on pulse tube crycooler

摘要

A frequency mixing and phase locking system is designed, in which electromagnetic shielding, microwave coupling, and intermediate frequency (IF) measurement arrangements are included. In lieu of liquid nitrogen, a pulse tube cryo-cooler is used to cool the whole system. With Josephson grain boundary junction as the mixing element, the 96th harmonic frequency mixing at 3 mm waveband is obtained, and phase-locked voltage-controlled oscillator (VCO) is realized.