A Ferrimagnetic Microwave Power Limiter

A new method of microwave power limiting is described. In contrast to limiters previously discussed, this type limits the power reflected from a ferrite-loaded microwave cavity, the limited output power being coupled into the load by means of a hybrid or a circulator. A characteristic feature of the limiter is that the limiting level may be adjusted over a wide range by a suitable choice of the volume of the ferrite sample. Furthermore, the level may with ease be continuously varied over a wide dynamic range merely by changing the position of the ferrite sample in the cavity. Experimental results are presented.