Patent ID: 7495521

Claim:
A multi-channel, non-reciprocal, electromagnetic wave propagation apparatus comprising: a first, planar ferromagnetic substrate forming a first flat disc that forms a first energy propagation channel, and having a plurality of RF transmission traces on a first surface and a layer forming a first ground plane on a second, opposite surface of said first planar ferromagnetic substrate, one of said traces forming an input port and a different one of said traces forming an output port; a second, planar ferromagnetic substrate forming a second flat disc that forms a second energy propagation channel, and having a plurality of RF transmission traces on a first surface and a layer forming a second ground plane on a second, opposite surface of said second, planar ferromagnetic substrate, one of said traces on said second, planar substrate forming an input port and a different one of said traces on said second substrate forming an output port; and a magnet disposed between said first and second substrates to excite a circular, unidirectional magnetic flux field in each of the substrates that limits electromagnetic wave propagation to one direction only in each energy propagation channel; and said first and second planar ferromagnetic substrates further being positioned parallel to one another and against opposing end portions of said magnet, and said planar ferromagnetic substrates not being connected to one another.