<s>
A	O
Goubau	B-Algorithm
line	I-Algorithm
or	O
Sommerfeld	O
–	O
Goubau	B-Algorithm
line	I-Algorithm
,	O
or	O
G-line	O
for	O
short	O
,	O
is	O
a	O
single-wire	O
transmission	O
line	O
used	O
to	O
conduct	O
radio	O
waves	O
at	O
UHF	O
and	O
microwave	O
frequencies	O
.	O
</s>
<s>
The	O
Goubau	B-Algorithm
line	I-Algorithm
itself	O
consists	O
of	O
a	O
single	O
wire	O
conductor	O
coated	O
with	O
dielectric	O
material	O
.	O
</s>
<s>
An	O
advantage	O
of	O
the	O
Goubau	B-Algorithm
line	I-Algorithm
is	O
that	O
it	O
can	O
have	O
lower	O
attenuation	O
due	O
to	O
dielectric	O
losses	O
at	O
high	O
frequencies	O
than	O
other	O
types	O
of	O
transmission	O
line	O
.	O
</s>
<s>
Goubau	B-Algorithm
lines	I-Algorithm
can	O
serve	O
as	O
low	O
loss	O
antenna	O
feedlines	O
at	O
these	O
frequencies	O
,	O
up	O
to	O
microwave	O
frequencies	O
where	O
a	O
waveguide	O
must	O
be	O
used.	O
"	O
</s>
<s>
Other	O
structures	O
besides	O
horns	O
have	O
been	O
used	O
to	O
couple	O
radio	O
waves	O
into	O
and	O
out	O
of	O
Goubau	B-Algorithm
lines	I-Algorithm
;	O
waves	O
can	O
be	O
"	O
launched	O
"	O
from	O
planar	O
structures	O
like	O
tapered	O
coplanar	O
waveguides	O
at	O
much	O
higher	O
frequencies	O
,	O
into	O
the	O
terahertz	B-Architecture
band	I-Architecture
.	O
</s>
<s>
The	O
Goubau	B-Algorithm
line	I-Algorithm
conducts	O
energy	O
via	O
one-dimensional	O
electromagnetic	O
surface	O
waves	O
,	O
analogous	O
to	O
the	O
two-dimensional	O
surface	O
waves	O
called	O
ground	O
waves	O
that	O
carry	O
the	O
signal	O
from	O
MF	B-Algorithm
AM	O
broadcasting	O
stations	O
to	O
home	O
AM	O
radios	O
.	O
</s>
<s>
The	O
ability	O
of	O
surface	O
waves	O
to	O
bend	O
and	O
follow	O
the	O
contour	O
of	O
a	O
conductor	O
explains	O
why	O
AM	O
radio	O
stations	O
can	O
be	O
received	O
on	O
the	O
far	O
side	O
of	O
hills	O
,	O
and	O
how	O
over-the-horizon	B-Architecture
radar	I-Architecture
works	O
.	O
</s>
