A broadband slot line non reciprocal microwave device which comprises a matched load placed on the face of a ferrite plate which is located within the microwave magnetic field of the slot line, said face being opposite to said slot and designed so that its height is larger than 3 times the width of the...http://www.google.co.uk/patents/US4027253?utm_source=gb-gplus-sharePatent US4027253 - Non-reciprocal broadband slot line device
