BPF design using ADS 2009

Hi all;
I'm a beginner.I have just started designing filters using ADS 2009. I designed a six element band pass filter. But the response is not smooth. Wat am i supposed to do ? Thanks in advance :)

hi check this

http://www.ashokpm.org/Project_report/BPF_Report.pdf

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The MINT Channelizer Intro

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http://post.queensu.ca/~saavedra/ele...torial%202.pdf
http://ecadigitallibrary.com/pdf/CAR...KIM-KREI_a.pdf

* It would much help if you could show us your circuitry. Otherwise, it seems to be problematic to give any comment.
* Your response is "not smooth"? Time or frequency response? What do you want resp. expect from your filter?

I have attached my circuit and the frequency response. Thanks for your reply :)

You can optimise the your design in ADS, and you can set the S21 range for optimising flatness.
Your filter seems have problem, its S21 < -30dB, that should have problem normally in design. The S21 normally is several dB.

Set a smaller frequency step, so that you can see what happens in the passband. At the moment, you only have 3 data points there.

Yes, you need much more data points for evaluating the frequency response.
In addition, what are your requirements - that means, which filter characteristic (ripple within the passband) do you want?

@All
Your reply was helpfull. Can you tell me how to create the layout using ADS 2009 ? Do we have Auto- layout ?

For ideal lumped components? No.

How do we create layouts if we use lumped components for the design ?

I used to simulate in ADS, and then verify in AWR, then export AWR layout in DXF format. The dxf can be imported into Altium for PCB.

i'm have a few suggestion
if you simulate the BPF ,
Simulation set sweep point up to 201 or 401....
maybe can solve your question .

Have a look at the ADS examples, like examples\RF_Board\cellular_pamp_prj

@volker_muehlhaus : Where should i look for this example ? Is it possible to create layout with lumped components design ?

It is part of the ADS examples. You can see the path in my screenshot.

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