Say a beam has 5db forward gain and a front to back difference of 20db.
Where does the extra 15db go? I mean, if you loose 20db off the back on
transmit, I assume you also loose that much on receive. What happened to the
20db? Did it burn up as heat? What am I missing here?

--
Steve


The analogy to a balloon is pretty apt.

Squeeze and pinch the back so only about 1/50 th of the air that used to be
there is left. The rest gets distributed towards the front, and makes the front
side more than a factor of two bigger. But the ratio of the amount of air in
the front to that of the back is very big--say, 100.

That's a 20dB F/B.

Hope that helps.

73,
Chip N1IR