Embodiments of integrated device and associated methods of design are provided. Such embodiments include a metallic ground plane, dielectric material, ferrite puck and formed metal layer configured to define circulator and microwave device portions, or functions, within an integrated device unit. Impedance characteristics of each functional portion are determined independent of one another and are optimized with respect to each function. Respective matching network portions of each integrated device optimally couple the circulator portion with a microwave device portion and one or more connector ports. Integrated devices of the present teachings can be applied modularly at the systems level of communications, radar, and/or other contexts.