What is AF (Antenna Filter)?

An antenna is a passive device utilized for sending or getting a microwave signal. The transmitted microwave signal is sent first to a bandpass filter, where the bandpass filter chooses the necessary frequencies and rejects undesirable frequencies, the signal is then parted with the power splitter, there are a bunch of distribution circuits followed by the radiating elements. The advantages of combining antennas and filters are to reduce the size of the segment and also improve the performance of frequency selectivity of the filter.