ComNav Engineering specializes in microwave filters and filter subsystems. The company features proprietary coating techniques and cross-coupling and pole/zero typologies. It produces ceramic, cavity and chip and wire filters. ComNav Engineering incorporates advanced materials, computer numerical control machining, pick-and-place assembly and statistical process control in its processes. The company also performs custom design, engineering and packaging services. Its products serve applications in cellular systems, remote metering, global positioning, automatic toll systems, noise reduction, multiplexing and wireless Internet operations. ComNav Engineering was established in 1991 and is based in Portland, Maine.