A method of making a composite powder metal disk for a rotor assembly in a synchronous reluctance machine. The system may take advantage of multiple transmitter antenna elements andor multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element andor single receiver antenna element. Kinase-inducible domains can consist of canonical amino acids, allowing their use as expressible tags of protein kinase activity. Protective tape is provided on a first region where the first board and the third board overlap, and in a second region where the second board and the third board overlap.