Step attenuator HMC629A performance at low frequencies

Hello,

I measure step attenuator HMC629A on the EVB (EV1HMC629ALP4E). This attenuator is specified from DC to 10GHz, but the performance seems to be not fulfilled at low frequencies. In order to verify the parameters, I changed the capacitors C1, C2, C4...C8 to 2.2uF/25V. The attenuation graph (with applied change) setting vs.measurement is OK even at low frequencies.

But the IIP3 parameters degrades significantly at lower frequencies in spite of it is specified DC...10GHz in the datasheet. It shall be typ. 55dBm, but I measure ~22dBm.

Is the specification of IIP3 in the datasheet correct?

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