HELP!!!About the impedance matching of LNA

I have to design a matching circuit of the low noise amplifier which operates at 434MHz.
I gained the S11 and S22 of the chip by measurement.
And then I designed the matching network through the S Parameter.
But the result shows that my design is quite poor.
The stripe whose Zc is about 70 ohm and length is 6 degree has benn under considered.
The chip is designed by myself so that i don't have any datasheet.
The PCB under test with and without matching circuit is the same one.
But the components I used haven't been verified to work under this band.
Can anyone help me or any suggestions?

It's not easy to help using the information you provide. A schematic diagram and plots of S11 and S22 of your chip would be helpful. And a picture of the layout as well.

The failure sources can be several: S11/S12/S21/S22 chip measurement errors (calibration errors), dimensioning errors of the matching network (how was the matching 'stripe' of 70 ohm impedance at 6 deg length determined?), etc