The Laird Technologies Shielding Effectiveness Calculator relies on a library of standard shielding materials, to estimate EMI shielding effectiveness. Users can also simulate their own material by entering the material’s relative conductivity and relative permeability. Parameters for shielding computations, i.e., material thickness, relative permeability, relative conductivity, and a user-defined pattern of apertures, are entered through a simple interface. Other selectable parameters include aperture aspect ratio, frequency range, and emitter location and distance. Multiple measurement units are also supported. As information is entered, the calculator computes shielding effectiveness, and if there are apertures, it plots their pattern. It also plots shielding effectiveness over the selected frequency range. The online application is available for free on the company’s website. LAIRD TECHNOLOGIES, St. Louis, MO. (800) 843-4556.