In the attached image, the ans given for directivity is 44.68, but I'm getting 44.4. Who is correct?

 

http://www.l-com.com/content/Article.aspx?Type=N&ID=9475
http://www.antenna-theory.com/basics/directivity.php

 

http://www.l-com.com/content/Article.aspx?Type=N&ID=9475
http://www.antenna-theory.com/basics/directivity.php

Yeah, I understand what the directivity is, my question is about the wording of the question I've been given i.e. "A transmitter antenna has an eciency of 90The power density 20 meters from the antenna is 40 mW/m/m."


I'm not sure what it's saying here.

 

In the attached image, the ans given for directivity is 44.68, but I'm getting 44.4. Who is correct?

So your answer and their answer vary by less than one-half of one percent. And you're sure that this can't be accounted for by roundoff error (by either party)?

 

So your answer and their answer vary by less than one-half of one percent. And you're sure that this can't be accounted for by roundoff error (by either party)?

TBH I'm not sure about anything with this subject anymore.