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If you're using this LNA (as I suppose) in a receiver, with a low gain, the overall receiver NF will be degraded by the other components in the receiver chain (mixer, agc ....).
Using linear (non in dB) quantities:
Cascade noise factor: Feq=Flna+(Fother-1)/Glna
if for example NFother= 5 dB, overall NF=1.5 dB with your LNA in front.
Potential problem is
1) Insufficient AC isolation of the DC bias network.
2) Improper grounding of the amplifier.
3) Type of capacitor used.If the operating frequency is at 12GHz and you are using normal DC block capacitor, the ESR will be high leading to gain drop. (Recommend: ATC 600S series capacitor)
4) Substrate used. Again if the operating frequency is at 12 GHz, using FR4 will lead to significant gain drop.
If you want to know more, tell me your operating frequency, substrate used, and type of DC block capacitor being used.
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