A dual-resonator YIG oscillator with a main YIG resonator and a stabilizing YIG resonator both suspended in a common magnetic field. The main YIG resonator takes on the high-Q factor aspects of the oscillator, while the stabilizing YIG resonator helps stabilize the operation of the main YIG resonator, and also allows the main YIG resonator operate at higher magnetic field strengths, achieving higher frequency operation. The stabilizing YIG resonator also enables the oscillator's active device to operate in a more linear, lower phase noise, regime. As compared to conventional YIG oscillators, the disclosed dual resonator YIG oscillator provides significant performance improvements, such as higher frequency operation, lower power consumption, higher tuning speed, and lower phase noise.

A high frequency yttrium iron garnet oscillator is described that comprises a coplanar yttrium iron garnet resonator. The coplanar yttrium iron garnet resonator has an yttrium iron garnet sphere, a coplanar coupling structure and a coplanar waveguide. The coplanar coupling structure is integrated with the coplanar waveguide. The coplanar coupling structure is coupled to the yttrium iron garnet sphere. Further, a method of manufacturing a high frequency yttrium iron garnet oscillator is described.

A high frequency yttrium iron garnet oscillator is described that comprises a coplanar yttrium iron garnet resonator. The coplanar yttrium iron garnet resonator has an yttrium iron garnet sphere, a coplanar coupling structure and a coplanar waveguide. The coplanar coupling structure is integrated with the coplanar waveguide. The coplanar coupling structure is coupled to the yttrium iron garnet sphere. Further, a method of manufacturing a high frequency yttrium iron garnet oscillator is described.

Circuits, methods, and apparatus that can provide oscillator circuits that have reduced phase noise. An example can provide a yttrium-iron-garnet oscillator in a loop with a loop amplifier and a phase-shift circuit. The yttrium-iron-garnet oscillator can act as a resonator. Quadrature outputs of the yttrium-iron-garnet oscillator can drive a phase detector that can provide a control signal to the phase-shift circuit. The phase-shift circuit can then reduce or cancel phase noise in the loop, thereby enabling the loop to provide a reference signal having reduced phase noise.