How do I connect 2 balun transformer to gether ?

Hi all

I would like to use 2 balun transformer to cover wide frequency range

my impedance need is 50 ->200 ohm

I can't find a single balun to cover the entire frequncy range so i adviced

to use 2 transformer to cover the entire range

How do I connect 2 transformer together ? with minimal effect on the

circuit input impedance

Thanks


Bobi

What is your "wide" freq. range ?
4:1 baluns can be made 2 decades or wider up to 1-2 GHz upper freq. range.

You have to use Diplexer which has a input impedance 50 Ohm and it has 2 output that covers the frequency bands which is interested in.

Namely it's a low-pass high-pass filter with impedance matching and adaptation circuit.

You may use commercial available Diplexer design program for this purpose such as NuHerz

Which frequency are you interested in ? The frequency band is very wide ?

I need to cover the frequency range of 10 Mhz to 2.5 Ghz


best




bobi

you must use coaxial baluns. see the paper: 100:1 baluns, 1966