variants of lc baluns

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Generally speaking, the "two components" variant will not necessarily achieve the intended impedance matching. If it's a PA balun, you'll most likely want an additional low-pass filter, so the "two components" balun will give sufficient degrees of freedom.
 

They are used for wider bandwidth but their precision is less than original one.
 


I guess you mean "three omponents" balun in the last sentence? Both versions transforms a real impedance to another real impedance, do you mean that the "three omponents" balun can match complex loads as well? I thought the balun only transferred the real impedance and that the potential imaginary part of the load was taken care of by an added matching component/network.
 

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