Patent attributes
A multi-channel circulator or isolator well suited for use in phased array antennas or other RF devices where space and packaging constraints make the implementation of a conventional circular or isolator difficult or impossible. The multi-channel circulator/isolator can be configured as an isolator by the inclusion of one or more load resistors at one of its ports. In various configurations two or more ferrite substrates are provided that each provide a plurality of transmission ports. One or more permanent magnets are used to simultaneously provide the magnetic flux field through both of the substrates. The substrates can be configured such that they are spaced apart by a small distance, or positioned face to face in contact with one another. One or a plurality of magnets can be used depending upon RF requirements. Each substrate forms an independent electromagnetic wave propagation channel that limits the propagation of RF energy between its ports in one direction only.
