| There are three main types of RF adapters: coaxial, waveguide, and coaxial/waveguide. Coaxial RF adapters | 
| connect two dirrerent types of coaxial cable, or terminate a coaxial port. Waveguide RF adapters connect two | 
| different types of waveguides, or terminate a waveguide port. Coaxial / waveguide adapters connect a coaxial | 
| cable to a waveguide, or vice-versa. Product specifications to consider when selecting RF adapters include | 
| frequency range, maximum input power, voltage standing wave ratio (VSWR), return loss, and adapter style. | 
| VSWR is a measure of the amount of RF power reflected back to the signal source because of impedance | 
| mismatches. Styles for RF adapters include straight jack-jack, straight jack-plug, straight plug-plug, angled | 
| jack-jack, angled jack-plug, angled plug-plug, jack-jack-jack tee, plug-plug-plug tee, plug-jack-plug tee, jack- | 
| jack-plug tee, and plug-plug-jack tee. http://www.cmpter.com/adaptersintro.asp |