Impedance mismatches

How can you translate a P1dB for a 1 ohm circuit that is mismatched from the 50 ohm test equipment

There is a resistive impedance match, but of course that doesnt work well over the frequency range that us 500 MHz to 1 G

The circuit looks like this right now:

What should be the meaning of P1db for a passive filter?

My filter is active and i want to test its linearity.

Thanks

The problem is that 1 ohm real impedance can't be easily implemented for wide band, I wonder how the interface of your filter looks like?

But provided you made an impedance matching network, you can verify it's parameters with a network analyzer.

The other point is that the divider has > 30 dB attenuation, so you'll need a lot of input power to achieve reasonable power levels at the 1 ohm interface.