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Bandpass Filter at 17303.5MHz

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chandregowda

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bandpass filter spec

hi,
i am just beginner in microwave filter/engineering, can anybody please suggest/help me which Bandpass filter design method to follow to meet the below specs (someone told that it is only through Cavity filter design)?

Center frequency 17303.5MHz, +/-10MHz 3dB Bandwidth (20MHz Bandwidth), 50dB attenuation at +/-70MHz (from the center frequency).
Is it possible to design a filter with such low bandwidth specs at very high center Freq?

if any tutorials to simulate using HFSS helps a lot........

Thanking in advance
 

Your spec suggests loaded Q of more than 865. It may be not easy to achieve. Also you need so high precision about 0.03% for the central frequency. I am not sure that your spec real. Also, definitely HFSS cannot provide so high accuracy as your spec asks.
 

hi,

this specs are given by one of our client company, i was told that it is applicable for Fixed Service Satellite (Ku band).......

thank you
 

Client company may ask whatever they want and often they provide unrealistic spec. It may be undoable or too expensive. There also may be a problem with stability of parameters.
 

hi,
thank you sir, if possible will you suggest me some books to start practically realising filters and if any tutorials to simulate using HFSS.

i have gone through Microwave engineering by Pozar, Stipline line ckt design by Artech house

waiting for ur reply....
 

GO to this post
There are many HFSS tutorials


Also there is filter tutorial.
For books search in google.com

Best of luck
Abhishekabs
 
Good book is Microwave Filters, Impedance Matching network and Coupling Structure. Matthaei. I am not doing filter design for Ku band, so do not remember a lot of books fot such filters. HFSS may be a good start, but do not expect high accuracy from this program. Your spec is very tight, therefore there is good chance that you will design your filter and then fine tune it to the spec. I think this is possible, but how long it will keep tuned parameters? With so high tolerance it may be a problem.
 
If you will do it alone it may take a couple of months to have the first prototype. Tuning may be a nightmare with your spec. Good chance that there will be at least two proto rounds, may be even three. You may try to send your spec to a filter company and ask about quotation. Their answer can tell you a lot. But be ready to their call and questions about the spec.
 

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