Spectrum Control (formerly known as API Technologies) is a company that designs and manufactures systems and components for RF, microwave, electromagnetic, power, and security applications. It offers board mount and panel mount EMI filters, interconnects, RF amplifiers and filters, switches and detectors, power dividers, couplers, splitters, optical transceivers, converters, switched filter banks, application-specific subsystems, custom microelectronics, etc. The company caters to the aerospace and defense industries.