balun....simple

[naumanhbk]

hello!
i am designing a balanced antenna just like dipole which is fed from the center. i need to design a balun to feed the antenna with aport of 50 ohm impedance.
can anyone tell me some thing about this..
i have no ideaa.
thanx

 

[drkirkby]

A 1:1 balun can be made from two sections of transmission line. One is 3 lambda/4, the other is lambda/4. Of for a 4:1 balun, use a single section of transmission line of lambda/2 in length. You can Google these. If the frequency is too low to make transmission line practical, then a transformer on a ferrite can be used.

You did not ask about HFSS. I don't know if you are trying to simulate something in HFSS. In that case, I'd be interested in what you get, as this is something I did once think about, but decided it was too much effort to make the coax and link it back on itself.

Dave