Microwave devices demand nowadays small sizes and broad bandwidth. Ferromagnetic nanowired membranes are ideal candidates for this purpose. Planar, tunable and nonreciprocal devices can be designed with them. Therefore we propose an isolator concept based on such a material. Its principle is based on a nonreciprocal microstrip line.
Spiegel, J., de la Torre, J., Piraux, L., & Huynen, I. (2009). Isolator concept based on ferromagnetic nanowired substrates. 2009 IEEE MTT-S International Microwave Symposium Digest (MTT), p. 29-32. https://doi.org/10.1109/MWSYM.2009.5165624