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Antenna beamwidth? - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: Antenna beamwidth?
Posted: Sat Feb 10, 2007 3:30 pm 
 
Captain

Joined: Sat Apr 23, 2005 2:09 pm
Posts: 17
Location: Tampa, FL
:-)

If I am given an antenna pattern plot that looks like this:


How would I estimate its beamwidth?

I was thinking that I find the point where the antenna shows the maximum gain and trace through the plot from one side finding the 3-db point and trace the opposite side finding another 3-db point. Is this correct? :?


 
   
 
 Post subject:
Posted: Mon Feb 12, 2007 5:00 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Yes, that is correct.
Some people quote the full side-to-side beamwidth as you describe, while others state the angle as +- x degrees, ie each side of the max gain direction.






Posted  11/12/2012
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