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→Antenna Efficiency
As we have directional antennas, one obvious question we can get for what angle we can get good radiation power? Although the answer to this question also depends on receiving setup, it is generally defined as the point where the power output drops to half its maximum value. When converted to dB it amounts to approx 3 dB loss, hence it is also called 3 dB point. In one plane, there are going to be two such points. The angular separation between the two points is half power beamwidth or 3 dB beamwidth.
=== Antenna Efficiency <ref>http://www.antenna-theory.com/basics/efficiency.php</ref>===Antenna efficiency is basically ratio of power radiated from the antenna to the power delivered to antenna. In short, it denotes the losses due to antenna. Antenna efficiency could be further categorized into radiation efficiency and impedance mismatch, total efficiency being the product of the two. The losses could be attributed to three major factors:
* '''Conduction losses:''' These are losses due to finite conductivity of elements of antenna
* '''Dielectric losses:''' The electric fields induce current in the nearby dielectrics reducing the energy carried by fields. These are dielectric losses