Nonlinear Magnetostatic Wave Transmission Lines and the Aspect of Their Use for Generation and Signal Processing in the Microwave Frequency Range

The paper demonstrates the theoretical and experimental investigation results of the nonlinear responses of the transmission lines with the ferrite films at the excitation of various type magnetostatic waves. Two basic nonlinear mechanisms in the ferrite films are considered. The first mechanism is conditioned on the excitation of the short-wave spin waves by the pump wave and the second one is conditioned on the nonlinearity of the medium. The presence of the second mechanism accounts for the wave modulation instability. The possibility to develop microwave devices of various functionalities on the basis of such transmission lines is discussed. The aspect of the use of nonlinear magnetostatic wave transmission lines for the signal processing and signal generation in the microwave frequency range is also considered.

It is shown that nonlinear microwave devices on the basis of the - microstrip transmission line - ferrite film - systems can be used as signal-to-noise enhancers, power limiters, nonlinear phase shifters and the various correctors. The use of the nonlinear magnetostatic wave transmission lines in the self-oscillatory systems for the chaotic signal generation in the microwave frequency range is perspective. The use of multi-layer ferrite structures, in particular, of two coupled ferrite films in the transmission lines is also considered. The availability of the coupling allows one to control nonlinear processes in such systems.