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

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

Active band pass filters are used to attenuate frequencies below and above a range of frequencies (i.

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

Passive filters are implemented using only passive components such as resistors, capacitors and inductors.

RF band pass filters are active or passive circuits that pass signals from a specific frequency band and reject signals from out-of-band frequencies.

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