Directivity
Directivity is a measure of how well an antenna focuses energy in a particular direction. It is the ability of an antenna to concentrate its radiated power in a particular direction. Directivity is a function of the antenna's physical size and shape, and the wavelength of the signal being transmitted or received. A highly directional antenna will have a narrow beamwidth, which means that it can transmit or receive signals over a long distance with high gain in a specific direction. Directivity is an important parameter in space and astronautical engineering as it is used to design antennas for spacecraft communication systems, radar systems, and remote sensing applications. The directivity of an antenna can be increased by using reflectors, lenses, or arrays of antennas.
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