NONLINEAR MICROWAVE EFFECTS IN THIN SUPERCONDUCTING FILMS

The available experimental data on non-linear microwave effects in sup erconductors and some theoretical explanations of these, published sin ce 1964, are reviewed. Various mechanisms of non-linearity observed un der a wide variety of external conditions and in a broad spectrum of m aterials are discussed. Some examples of application of the non-linear ity to frequency mixing are considered and analysed in the framework o f a simple model of a fast-response resistive mixer.