Slot antennas are fed with waveguide.

Not always, it's very easy to feed them with microstrip or stripline.

True, but certainly not coax.



For once Gareth is correct, slot antennas can be, and are, fed with
coax. A quick Google or look in the RSGB VHF/UHF Handbook with show
several designs, mostly for 23cms and above.

Jeff

"Jeff" wrote in message ...
For once Gareth is correct, slot antennas can be, and are, fed with
coax. A quick Google or look in the RSGB VHF/UHF Handbook with show
several designs, mostly for 23cms and above.
Those are not slot antennas but Alford Slot Antennas from the name of the
inventor.
I don't think it can be said that it is only the gap that radiates .
For me those antennas are more behaving like magnetic loops in horizontal
polarisation made of a very wide flat conductor
The slot is the capacitor and also a parallel transmission line
Both not supposed to radiate.