What are the differences between sector panel, flat panel, solid dish antenna types?

what the diff between "sector panel" & "flat panel" & "solid dish"

why we use each of them?

&

does there is code for antennas like A1 , K , H ?

thx all

http://www.antennasonline.com/articles/feb01-1.htm

http://www.astronwireless.com/library.html

http://www.european-antennas.co.uk/fpa.htm


and more link .............

Good lock:D