Far-Field formula for Broadband Horn - RF Cafe Forums
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Post subject: Far-Field formula for Broadband Horn
Posted: Wed Jan 26, 2011 6:35 am
Joined: Mon May 05, 2008
I have a question about Far-field
I know two formulas for the Far-field
Lambda/2pi and 2D²/Lambda.
My question is about a Broadband Horn like 2-18
I don't know if I have to use the 2D²/Lambda
even for the low frequency ?
I heard if the
antenna was electrically small I had to use the
first formula but what is the electrically small
definition ? (Aperture size < to Lambda or more
Thanks for your help.
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