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directivity and beamwidth of antenna

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hogmeade

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Hi,
I have q question about the relationship between the directivity and the beamwidth:
The higher the directivity of an antenna the wilder the beamwidth ???

Thank you!
 

Just the opposite, the definition of the directivity: is how much more of the transmitted power goes to certain direction, comparing to isotropic antenna. In other words, if you have a very directive pencil beam antenna, it's beamwidth will be very small...
 

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