CUBIC INTERMODULATION COUPLING IN JUNCTION CIRCULATORS

Nonlinear intermodulation coupling in ferrite junctions have been solv ed analytically for the first time. Primary microwave excitations of t he ferrite junction at frequencies f(1) and f(2) will induce effective rf current at frequency 2f(1) - f(2) which generate intermodulation f ield within the ferrite satisfying the boundary conditions at the junc tion boundary. The static demagnetizing field has been shown to have a n adverse effect in increasing intermodulation coupling. Our calculati ons compare reasonably well with experiments. (C) 1997 American Instit ute of Physics.