Design of a unbiased microwave circulator using a magnetic nanowired substrate

In this paper, we present the design of a planar unbiased microwave cimlator operating at K-band. Using a composite substrate combining a polymer membrane with an array of ferromagnetic nanowires yields a nonreciprocal behavior similar to that obtained with ferrites but requiring any biasing DC magnetic field. This is a t"endous advantage compared to existing commercial solutions for such devices. A model has ben developed for the whole circulator, and is validated measurements On a first prototwe. It is used as a design tool for optimizing the performances of future prototypes: the sensitivity to various technological allows to identify the most crucial ones for a planar integration.