8-12GHz BPF Design

[B] :o

Hello all,

I need to design this filter:
passband:8-12G,RL<3dB,rip<2dB;
stopband:16-24,attenuation<-40dBc
I have tried some times with microstrip structure,but performance in stopband is poor.
Can you give me some advice?Thanks very much!

Anybody has worked out similar filter?

I didn't work on similar filter, but did you try eliptic response? Microstrip filter is a very wide description on what you have tried! By the way, there is a very good book available for download at Elektroda,

Hong, Lancaster: Microstrip Filters for RF/Microwave Applications

flyhigh

The BW is 40 % of CF.

Try cascading a LP and HP filter. An isolation amplifier between them might be necessary.

flyhigh:Thank you for your information.
GaAs FET:You suggestion is very good!

I have change my design.I deside to replace the BPF by a LPF!
And mwo simulation results is just ok!
I will make board to check its real performance!

flyhigh,

pls tell me the path of that book on this web.
I failed to find it!

I did a search on this site and found this address

http://www.elektroda.pl/eboard/searc...tml+filters+rf

I suggest you use interdigital filter.
It can has a bandwith of 40%.
And you can add a LP filter after it .





Good Luck.

You can use: G.Matthaei,L.Young "Microwave filters, impedance-matching networks, and coupling structures". The book is in the attachment module.