Analog circuit quistions

assalamao alaykom

i have an urgent quisition about something in analog communication systems ..

what is ment by the " stagger tuning " ? where and why it is used ?

thank you for help

In the stagger-tuning method, the resonant frequencies of the various stages combine so that together they pass the frequency band to be amplified.
The product of each stage’s amplitude response curve forms the overall response curve.

http://www.see.ed.ac.uk/~gjrp/EE3/Co...e13/sld015.htm

Very good link thank you ..
if you have another links to some RF (simple) Tutrial sites to give me .. please send .. thank you very much