FreeLists / si-list / [SI-LIST] balun theory

[atifshamim khan <atifshamimkhan@xxxxxxxxx>]

Hi all
 
Following figure is a basic balun structure. I have utilized this to feed/test 
an on-chip dipole on bulk Si, but I still dont know how it works in theory.
There is an unbalanced signal (Zin) at the input and a balanced signal at the 
output(load resistor ZL). Basically one end of the transmission line is 
grounded. At the output (the two ZL terminals) have  signal which is equal in 
magnitude but opposite in phase.This means that between the two transmission 
lines a phase reversal has taken place. How is this achieved or in other words 
how can we explain the working of this balun in terms of voltages and currents 
or electric and magnetic fields? My guess is that we are forcing and odd mode 
in the transmission lines? Is that right? what is the difference between odd 
mode and even mode impedances here. Any input in terms of explanation or 
references will be appreciated.
Thanks
Atif

                
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