What is the Relationship between Directivity and beamwidth?

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16. What is the Relationship between Directivity and beamwidth?

Beamwidth and directivity are both measures of the focusing ability of an antenna. An antenna pattern with a narrow main beam will have a high directivity, while a pattern with a wide beam will have a lower directivity. Approximate relation between beam width and directivity that apply with reasonable

accuracy for antennas with pencil beam patterns is the following:


where θ1 and θ2 are the beam widths in two orthogonal planes of the main beam, in degrees. This approximation does not work well for omnidirectional patterns because there is a well-defined main beam in only one plane for such patterns.

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