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Please, please, please urgent help needed for 25GHz, filter

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Jassim76

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Hello
Please, please, please urgent help needed for 25GHz, passband filter design.

For my project I need to design an 25 GHz passband filter in momentum ADS, (microstrip filter, not lumped element).
I use design guide in ADS and I use many days bout I cannot get the correct result.
Some time I get unrealistic dimension for the microstrip, example the spacing between the microstrip line are less than 0.2 mm and it cannot be made.

However please can somebody try to design it for me in momentum, ads.
Passband: 24GHz -26GHz
Substrate info: roger, Er=3.55,H=0.508,Cond=5.88E7,T=35um
 

Re: Please, please, please urgent help needed for 25GHz, fil

200 um is not unrealistic at 25 GHz It's very usual. Nevertheless, your specs are a bit fuzzy. What should be the attenuation in the stop bands? Flat or equirripple bandpass?...
 

Re: Please, please, please urgent help needed for 25GHz, fil

thanks for response
it can be Flat or equirripple, just it work.
i need it for my master project
 

Re: Please, please, urgent help needed for 25 GHz filter

...and the stop band attenuation? At 20 GHz? At 30 GHz?
 

Is this design for a project? if you will use this filter, you better change the substrate for the ease of manufacturing and what topology are you using for this filter?
 

Re: Please, please, please urgent help needed for 25GHz, fil

i can not change the substrate becuase my university want 0.508, i will use it in building a radar system at 25 GHz frequency, soo it should reject frequency below 24 Ghz and over 26 Ghz, i dont know what the attenuation should be.

sombady help plz
 

Re: Please, please, please urgent help needed for 25GHz, fil

Please, please, please sombody help
???????????????????????
 

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