RF and Microwave Useful Links or Tools:

   
Microwaves101Includes encyclopedia of terms and acronyms, useful on-line calculators, and downloads.
RF Globalnet – Microwave Industry News, Analysis, and Technical Articles
Modelithics – Industry leading provider of simulation models for RF, Microwave, and Millimeter-wave devices.
Black and White or Color Smith Chart (PDF)
Free RF Lineup Cascade Analysis Excel Tool
Electronic Symbols in MS Word .doc format