<s>
Radio-frequency	O
(	O
RF	O
)	O
engineering	O
is	O
a	O
subset	O
of	O
electronic	O
engineering	O
involving	O
the	O
application	O
of	O
transmission	O
line	O
,	O
waveguide	O
,	O
antenna	O
and	O
electromagnetic	O
field	O
principles	O
to	O
the	O
design	O
and	O
application	O
of	O
devices	O
that	O
produce	O
or	O
use	O
signals	O
within	O
the	O
radio	B-Algorithm
band	I-Algorithm
,	O
the	O
frequency	O
range	O
of	O
about	O
20kHz	O
up	O
to	O
300GHz	O
.	O
</s>
<s>
RF	B-Application
engineering	I-Application
is	O
a	O
highly	O
specialized	O
field	O
that	O
typically	O
includes	O
the	O
following	O
areas	O
of	O
expertise	O
:	O
</s>
<s>
Application	O
of	O
circuit	O
elements	O
and	O
transmission	O
line	O
structures	O
in	O
the	O
design	O
of	O
oscillators	O
,	O
amplifiers	O
,	O
mixers	O
,	O
detectors	B-Algorithm
,	O
combiners	O
,	O
filters	O
,	O
impedance	O
transforming	O
networks	O
and	O
other	O
devices	O
.	O
</s>
<s>
Verification	O
and	O
measurement	O
of	O
performance	O
of	O
radio	B-Application
frequency	I-Application
devices	I-Application
and	O
systems	O
.	O
</s>
<s>
To	O
produce	O
quality	O
results	O
,	O
the	O
RF	B-Application
engineer	I-Application
needs	O
to	O
have	O
an	O
in-depth	O
knowledge	O
of	O
mathematics	O
,	O
physics	O
and	O
general	O
electronics	O
theory	O
as	O
well	O
as	O
specialized	O
training	O
in	O
areas	O
such	O
as	O
wave	O
propagation	O
,	O
impedance	O
transformations	O
,	O
filters	O
and	O
microstrip	O
printed	O
circuit	O
board	O
design	O
.	O
</s>
<s>
Radio	B-Application
electronics	I-Application
is	O
concerned	O
with	O
electronic	O
circuits	O
which	O
receive	O
or	O
transmit	O
radio	O
signals	O
.	O
</s>
<s>
List	O
of	O
radio	B-Application
electronics	I-Application
topics	O
:	O
</s>
<s>
The	O
RF	B-Application
engineer	I-Application
job	O
description	O
at	O
a	O
broadcast	O
facility	O
can	O
include	O
maintenance	O
of	O
the	O
station	O
's	O
high-power	O
broadcast	O
transmitters	O
and	O
associated	O
systems	O
.	O
</s>
<s>
There	O
are	O
many	O
applications	O
of	O
electromagnetic	O
theory	O
to	O
radio-frequency	B-Application
engineering	I-Application
,	O
using	O
conceptual	O
tools	O
such	O
as	O
vector	O
calculus	O
and	O
complex	O
analysis	O
.	O
</s>
