The generated pulses travel from the transmitter to the reflector (via the duplexer) through either coaxial cable or a hollow, generally rectangular, metal tube called a wave guide, which prevents excessive power loss. The RF energy is injected into the waveguide by a probe, which is simply an antenna that only radiates into the waveguide.
The phased array system uses slots in the flat plate to act as waveguides.
Suggest you google "waveguide image" to get a picture.
Last edited by paco; 19th September 2012 at 06:14.