Help me with a 8-12GHz BPF design

[STD]

8-12GHz BPF Design



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!

 

[STD]

Anybody has worked out similar filter?

 

[flyhigh]

Re: 8-12GHz BPF Design

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

 

[VSWR]

Re: 8-12GHz BPF Design

The BW is 40 % of CF.

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

 

[STD]

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!

 

[STD]

flyhigh,

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

 

[flyhigh]

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

**broken link removed**

 

[filtersir]

Re: 8-12GHz BPF Design

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





Good Luck.

 

[borich_03]

flyhigh,

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

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