Problem with BPF design values after using ADS

[david753]

BPF design

I am going to design a BPF, the center at 26MHZ, span with 2MHZ.
After using ADS, I got the result at folling link.
**broken link removed**
But, I found the value of L2 is too big.
It seems to effect the INSERTION LOST, and hardly make it.
How to revise it to better value?

 

[tyassin]

Re: BPF design

Hi

Have you used the optimizing tool in ADS?
Maybee it can give you some better component values.

 

[cjg40]

Re: BPF design

optimizm is theorical result, you need to adjust it on the practical board.

 

[david753]

Re: BPF design

Could you please tell me how to use the optimum setting?
Please refer to as following link.
**broken link removed**
I was confused in GOAL setting and optimum setting in ADS.
Please give me explanation in details and step by step description as possible.
Appreciated.

 

[biff44]

Re: BPF design

That IS a big one. You could transform down in impedance, hit the filter, and transform back up again. You could change to a different filter topology. You could play around with the ripple allowed to get some relief.

 

[david753]

Re: BPF design

I cannot understand what you said.
Could you please explain it in details?
Does it mean the WIZARD of filter design is useless in ADS?

 

[biff44]

Re: BPF design

ADS: written by software geeks
Bandpass filters: designed by RF Engineers

Never the twain shall meet!

 

[yesman]

BPF design

Why do you want to use @ds to design BPF? It is hard to use. Use Ansoft designer or other "simple" softwave , pls.

 

[david753]

Re: BPF design

really?
I don't know ADS is not suitable for filter design.
Which aspect is its strength?
I don't have ansoft, could you help me to design my BPF, 26MHZ center, 2MHZ SPAN?
Appreciated.

Added after 43 seconds:

really?
I don't know ADS is not suitable for filter design.
Which aspect is its strength?
I don't have ansoft, could you help me to design my BPF, 26MHZ center, 2MHZ SPAN?
Appreciated.

 

[wjwreck]

Re: BPF design

i think ads can simulte filter but it is theroy . you can simulate filter and turn the practice circuit.

Added after 22 seconds:

i think ads can simulte filter but it is theroy . you can simulate filter and turn the practice circuit.