OK,who can tell me how to design a valid microstrip T power divider?

[chenchangfu]

Recently,I designed some microstrip T power divider.But I still could not get the the ideal parameters.I used two models to design the divider.
Who can tell me what should I consider during the design?The pictures of design are uploaded.

 

[kspalla]

Both logic's are OK, First identify the parameters/goals you need o achieve. Both fail on isolation requirement. What do you mean by ideal parameters?
But I still could not get the the ideal parameters.

 

[chenchangfu]

I want to get the S21=s31>-3.5dB during the frequency range 12GHz~13GHz.

 

[kspalla]

how much you are getting now and what material being used?

 

[chenchangfu]

I will give you the capture of S11,S21 and S31.You can have a analysis on the data.

 

[kspalla]

you share the results but not on material used. share the design too

 

[chenchangfu]

The model is uploaded,you can have a look.

 

[kspalla]

can u try with 62 mil substrate? to reduce loss.

 

[chenchangfu]

OK,I will have a try.

 

[kspalla]

How r results now?

 

[chenchangfu]

I changed the substrate high to 62 mils and simulated the model.But it is a pity that I got bigger loss than before.The S21 and S31 was about -5.8dB.

 

[kspalla]

Have u scaled the model?
I guess not hence more loss.
You need to re-calc the line widths for 62mil substrate.

 

[chenchangfu]

Yes,I have scaled the model and re-calc the microstrip lines.But I got worse result.