The Filter HMC1023LP5E Insertion Loss

I am evaluating the filter HMC1023 with the Eval board. I sent the input signal to IIP pin, and the output OIP pin to the Spectrum analyzer. The result Insertion loss = 10dB +, and this is way too much. My question is what is the resistor network (R21, R12 =174 Ohms and R11 = 140 Ohm) for? This network also applied to whether with or without the T1 (ADT2-1T). Can we use T1 without this resistor network? Please help.

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