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Harmonics problems on Lattice-type LC Balun

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tc1220

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I am trying to combine the power from two differential outputs of PAs. Indeed, Lattice-type LC Balun works well on the power combination.

However, the problem found is the significant harmonics which would degrade the linearity.

Anyany has experience on the Lattice-type LC Balun? And how to reduce the harmonics especially 2nd & 3rd.

Many thanks in advance.
 

LC balun is narrow band, so to reduce harmonics of the combined PA's you have to place a Low Pass Filter after the balun.
 
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    tc1220

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Thanks very much. Furthermore, any wideband balun??
 

Try a balun transformer.
**broken link removed**
 

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