Useful Links for Understanding Low Observables

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Radar Cross Section on Wikipedia
http://en.wikipedia.org/wiki/Radar_cross-section
Take with a grain of salt, for example RCS is independent of size. Size is only important as it relates to a wavelength.

NATO overview of Radar Cross Section for flight test engineers
ftp://ftp.rta.nato.int/PubFullText/RTO/AG/RTO-AG-300-V14/AG-300-V14-19A.pdf

"Radar Cross Section 2nd Edition"
http://books.google.com/books?id=j7hdXhgwws4C&lpg=PA271&dq=radar%20absorbing%20material&pg=PP1#v=onepage&f=false


"Radar principles for the non-specialist"
http://books.google.com/books?id=pd71EFWpVZMC&lpg=PA79&dq=radar%20cross%20section&pg=PA79#v=onepage&f=false

Antenna length calculator:
http://www.qsl.net/kb5wck/antenna.html


And if it returns...
"Military Critical Technologies List: Section 18: Signature Control Technologies"
Reading the list of export controlled signature control technologies gives a very good idea of what the state of the art is. Since SPF linked to this document a few months ago it's been removed from public facing websites.
http://www.dtic.mil/mctl/MCTL/Sec18MCTLg.pdf

 

[bipa]

http://www.microwaves101.com/encyclopedia/absorbingradar2.cfm

 

[quellish]

http://www.microwaves101.com/encyclopedia/absorbingradar2.cfm

I thought about including that, but because they sell absorbers it focuses almost exclusively in that direction

 

[quellish]

I'll be updating this in the next few days/week with some original information once I have a few hours to spare.