"amdx"


I was surprised there was no matching section, I thought a folded dipole
would have a higher impedance than 50 ohms.



** A folded dipole, * all on its own * presents 300 ohms at resonance.

But when surrounded by directors and a reflector, the impedance changes
dramatically.

Simple to arrange things so the impedance drops to 50 ohms, to match
standard RF feeder co-ax.



What type toroid material would be used at 2.4Ghz, and I'm thinking it
would
look resistive at that frequency.


** Ferrites exist that work well at GHz.

http://www.univ.trieste.it/~carrato/.../murata_sf.pdf



....... Phil