Output matching network

Hi,

I have a question about an output combiner design. I have designed a 4 ways output combiner which provides transformation of impedance (50 ohms) to a desired impedance for the transistors.
I have simulated very good output power level and the matching network is very low loss but when I perform a small signal simulation I am getting a poor S22.

Do you have any idea ?

I guess your design is reactive combiner. If so, the bad S22 at load side is true. Go to Microwave 101 website and search combiner.

hi jayce
would you please prepare some schematic and describe through that.Actually I dont mean you correctly