are not devices familiar to most engineers even if they have been in
the RF business for many years. Most have heard of them but few probably
really know what a balun is, how it works, and how it is used.
it wasn't until maybe a decade ago that I ever even came into contact
with one - at least that I was aware of. Having spent most of my career
connecting cables and waveguide to pre-designed, pre-packaged components,
there was never a need to convert between balanced and unbalanced transmission
lines. The many analog circuits that I did always used ICs that had
single- or double-ended inputs and/or outputs so it was never necessary
to be concerned with the details. Now that I have been reading the ARRL's
QST magazine monthly for the last few years, an appreciation for and
understanding of baluns is really settling into the gray matter. I in
no way consider myself an expert now, but am pretty confident that at
least my visage won't assume that telltale deer-in-the-headlights look
before my eyeballs roll back. If you are a balun novice, there is probably
no better primer for your reading edification than Roy Lewallen's "Baluns:
What They Do and How They Do It" paper.
Note: The URL provided at the end of the article
is no longer valid. Use this one instead:
Some Aspects of the Balun Problem.
Posted December 4, 2013