Wrong Measurement in Dual-Band Power Amplifier

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ansan1993

Joined Oct 26, 2022
1
Hi everyone. I am a PHD student.
Currently, I try to design a dual band power amplifier at 1.4 and 3.5 GHz. I have gone to the last step of measurement with circuit shown in the attached picture, but my circuit just works well at 1.3 GHz and no gain appears in the high band. I see that my circuit has no problems in fabrication and just contains little lumped components as DC and bypass capacitor. Can someone give me recommendations to check as well as fix the problem. Thank you very much.
 

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