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.

Optical bandpass filters are designed to transmit a specific waveband.

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

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

RF low pass filters pass signals from low frequencies and reject signals from high frequencies

Long pass filters transmit a wide spectral band of long wavelength radiation while blocking short wavelength radiation.

RF high pass filters pass signals from high frequencies and reject signals from low frequencies