What is Antenna Directivity?

Antennas RF Basics 
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Peter McNeil - L-com Global Connectivity

Aug 21, 2017

Depending upon the physical construction of an antenna, every antenna has a three dimensional radiation pattern. This can either be Omni directional or directional in respect to plane parallel to earth. Any antenna with a radiation pattern that is less than 360° in such a plane, is known as a directional antenna. This means that a directional antenna will radiate and receive more effectively in a specific direction, which is true of all practical antenna. For example, a dipole antenna is an Omni directional antenna, where a Yagi antenna or parabolic antennas are directional. Directivity is a measure of how directional an antenna is. Directivity is typically given as the peak directivity of the main lobe of the antenna’s radiation pattern.