Abstract: 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.

Abstract: 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.

Abstract: A waveguide transition for use with an antenna aperture. The waveguide includes a tubular waveguide component with a concentrically disposed dielectric insert. In one embodiment the inner surface of the waveguide component is non-linear and formed by either a gradually curving surface or a plurality of linear sections disposed adjacent one another to form an overall non-linear surface when viewed in profile. In other embodiments the outer surface of the dielectric insert is shaped so as to form either a gradually curving surface or by a plurality of non-linear, adjacently formed sections that form an overall non-linear shape when the dielectric insert is viewed in profile. The waveguide of the present invention produces significantly improved cut-off frequency performance that allows a greater degree of flexibility in designing the antenna aperture with a desired operating frequency bandwidth.