Optimize a Transmission Line for Multiple Input Impedances by Zin in ADS

[mrdummy]

I have several values of input impedance (Zin) at different frequencies, and I want to design a transmission line that is optimal for all of them. How can I define multiple Zin values in my simulation? For example, can I use something like Zlist to input them?

 

[dick_freebird]

Is adding matching networks at the ports that don't, part of the plan?

 

[mrdummy]

Is adding matching networks at the ports that don't, part of the plan?

my plan
1- get some impedance from somewhere for different freq
2-put them in Zlist
3-put matching network for different frequency
4-optimize my matching network
5-my optimize goal is reach optimom network for all freq

my problem
how put i different z in zlist?

 

[volker@muehlhaus]

my problem
how put i different z in zlist?

Do you know S-parameter files in Touchstone format? They are inserted in ADS as S1P data blocks.

You can simply create the *.s1p file from your data, the format is quite easy:

# GHZ Z RI R 1.0
2.50000000 1.931798 33.86815
5.00000000 2.821692 70.57891
7.50000000 4.549278 114.5941
10.0000000 8.005523 173.2321
12.5000000 15.82539 262.4717
15.0000000 38.63353 427.7149

The header line says these are Z-parameters in real and imaginary part format, frequenz unit is GHz
In the example above, impedance at 5 GHz is 2.82 + j 70.57 Ohm etc.

Just create this in text editor and save as filename.s1p, then include in ADS using S1P data block.

https://ibis.org/connector/touchstone_spec11.pdf

--- Updated May 10, 2025 ---

One more comment: your simulation testbench is not a good idea. For your simulation setup, use the S1P data as the frequency-dependent load and a fixed 50 Ohm source port. Optimize S11 at the 50 Ohm port.