stepped impedance resonator design in ADS

If you casacde lines with different widths, you should include MSTEP elements that describe the electrical effect of that step. The MLIN element only includes the electrical model of the line.

Or in other words, if you do not include MSTEP elements, you might get a stepped-impedance low-pass characteristic response.

Agreed, without the MSTEP results are not totally different. But simulating with MSTEP is more accurate than cascading just the MLIN. And in some cases (extreme step in width at short line length, where we can't treat this as individual elements) all this model based simulation is not good enough and we need EM simulation to get really accurate results.


Agreed, without the MSTEP results are not totally different. But simulating with MSTEP is more accurate than cascading just the MLIN. And in some cases (extreme step in width at short line length, where we can't treat this as individual elements) all this model based simulation is not good enough and we need EM simulation to get really accurate results.

@laperla, what do you think is wrong with your result? It shows basic stepped impedance low pass response.

NLINE has only W and L and doesn't have Teta(Electrical lenght)

SIR is a typical resonator but in S21 I don't see any resonance. Base on this paper this resonator has to resonance in 1.5G

You confused me because you have MSUB block, but then didn't use microstrip lines.

You used ideal lines - is the 2GHz frequency the correct frequency for this phase value?
You mentioned a paper/reference, but forgot to include that, so nobody knows what results you expect.

You confused me because you have MSUB block, but then didn't use microstrip lines.

You used ideal lines - is the 2GHz frequency the correct frequency for this phase value?
You mentioned a paper/reference, but forgot to include that, so nobody knows what results you expect.
What you have drawn is a low pass, and the results that you show are low pass results.

for defining substrate, I used MSUB block...Should I use other block?

That is fine - but it only has an effect for MLIN and other microstrip lines. It has NO effect for your ideal lines, of course.

I cann't define Teta with MLIN
Now, How can I show of S21 with resonance at 1.5GHz?

Yes, of course. You must convert electrical parameters to physical dimensions. One way to do this from the ADS schematic window: Tools > Linecalc.

?

I did it but it doesn't change

Yes, this is the correct result for your layout (lowpass).
Here is the result from another simulator (EM) for the same layout:

I attach the paper here...this schematic has to resonance!

Yes, but it is a totally completely different layout. The resonators are coupled to the feedlines with coupled lines (gap). In your case, you have placed ports on the resonator - totally different.

you mean that the couple SIR work as resonator?
and I have to consider both coupled SIR?

Yes, you must include the coupling structures (coupled lines with gap) to make it a resonator. With the ports directly connected, it works as a low pass filter.

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