There is a rising concern in the electronics industry regarding increased pollution in the form of electromagnetic interference (EMI), radio frequency interference (RFI), and spurious signals caused by electronic devices and radiating cables.Since some effects of this pollution can be extremely dangerous, many countries require commercial and military products to meet electromagnetic compatibility (EMC) standards before they are placed on the market.In order to test devices against EMC/EMI standards and ensure their compliance, anechoic and reverberation chambers are employed. This application note discusses using computational electromagnetic (CEM) simulation tools are ideal designing custom anechoic chambers.