Problem with gain in Ku SSPA

in my ku band sspa there is problem of gain lot of absorber tuning req at input stage to get the desire gain can anybody tell me the cause of this problem, is it a mismatch , cavity etc any doc regarding cavity design, i am using 50 ohms match MMICs the input stage have high gain MMIC and output are high power FET.

Hello, your problem description is not clear.. can you reword it?

On the other side, i can say that in Ku band TWTA are more indicated... why did you choose SSPA?

What requirements do you have?

Let me know.

Regards,

Lupin