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Some problems with the wilkinson power divider

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CQCQ

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Hi! I have some problems with the wilkinson power divider,the picture of my power divider as follow.

1. Will the TL1 ,TL3&TL4 's length can effect the S11 or S22 and S33?If so,the length of TL1 ,TL4&TL4 must keep a special length as λ/4 or any other value?

2. I have sim it with ADS,but I found the S22(return loss of PORT2(TL3))is very very bad! but the S11 is very good(I think),how can I solution this problem?
Thanks in advance!

CQCQ
 

What is you isolation resistor? It should be 100 Ohms.
 

Take a look at these sites. They may be helpful. Length of the lines is an issue as they discuss.

h**p://www.ee.bilkent.edu.tr/~microwave/programs/magnetic/mwpower/wilkinson.htm

h**p://www.microwaves101.com/encyclopedia/Wilkinson_splitters.cfm
 

Hi,

You should make a model of you divider in momentum and then create a new schematic diagram and put 100 ohm resistor between the outputs. This is called co-simulation. Your circuit is not considering 100 ohm resistor and thus the output matching is bad.

Erno
 

The resistor helps in isolation of the ports. but the BAD return loss of the Difference ports(s22,s33) is due to impedance mismatch at those ports. you should try to tune the length of the lambda/4 section to get an optimum response.
 

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