ldagan wrote on 8/6/2017 7:17 AM:
Hello all. If we assume that the antenna's surrounding is air, then my
assumption is that dielectric losses for the antenna are rather
negligible. What type of antennas are usually showing higher effect of
ohmic losses?
I mean, I know that reflector antennas are usually little susceptible to
ohmic losses. But some types are not, my assumption would be loop
antennae,
Another thing is attenuation in waveguides. I assume that it would be
the case with many tens of GHZ, for rectangular device. But, as I am
only guessing, as I have been out of the game for long.

Small loop antenna work with large currents and so suffer from ohmic losses
more than many other types.

--

Rick C

first of all, thanks.
I mean, yes, currents are higher, but I was talking in relative terms, not absolute terms. I mean, reflectors and horn antennas can send very strong currents, or are you referring to high current density?
-Lior

ldagan wrote on 8/6/2017 1:40 PM:
first of all, thanks.
I mean, yes, currents are higher, but I was talking in relative terms,
not absolute terms. I mean, reflectors and horn antennas can send very
strong currents, or are you referring to high current density?

The current density depends on your design. If you use a very small
conductor for a loop the density will be higher than if you use a large
conductor. But in both cases the current in the conductor will be much
higher than in many other antenna types.

--

Rick C