Signal filters block or decrease (attenuate) unwanted frequencies or signal wave characteristics

Active filters are electronic filers that use active components such as voltage amplifiers or operational amplifiers.

Active band reject filters are tuned circuits that prevent the passage of signals within a specified band of frequencies.

Optical bandpass filters are designed to transmit a specific waveband.

Industrial air filters reduce the number of particles in the air that passes through them.

Filtration media and elements are designed to remove suspended particles from a process stream.

RF filters and microwave filters are devices that pass or reject signals by frequency.