Wilkinson power divider in HFSS

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Microwave123

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Hello all,

I have been working on a Wilkinson equal power divider. Most of the S matrix looks fine but the two output match is very poor, only -12dB or so. I have defined a RLC lump boundary for the 100 ohms resistor. The layout of my Wilkinson is attached. Please take a look and comment on why the output match is so bad.

Thank you!
 

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Your input legs are not constant impedance lines. All three legs going into your Wilkinson should be 50 ohm microstrip lines (assumed because you stated you used a 100 ohm load isolation resistor). I'd recommend taking your input lines straight up and down, then go into optimal 90 degree bends, so they are square to the board edge.

 
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