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A Low Pass Filter (LPF) is a device that passes low frequency signals and blocks signals above a certain frequency. The point up to which it passes signals is called the cut off frequency. Signals beyond this cutoff frequency are attenuated. Low-pass filters are designed to reject or heavily attenuate signals that operate at a frequency above the cut-off frequency.

An RF High pass filter is a filter that blocks low frequencies and passes the higher frequencies. Every high pass filter (HPF) is designed around a ‘Cutoff’ frequency which is the frequency below which there will be high attenuation and above which there will be very low loss. 

Band Stop Filters or or band-reject filters are used to block signals with a particular frequency range (or a particular set of frequencies). All signals in the stopband frequency range are attenuated and signals at other frequency ranges are allowed to pass with minimal losses. A bandstop filter is also known as a Notch Filter and these filters are formed by the combination of low pass and high pass filters with a parallel connection.