This L network intend to transform Z1 to 50ohms. The design was made using a smith chart:
The s-parameters plotted (S11 red - S22 green) in the smith chart is done sweeping the frequency from 200MHz to 5GHz for this L network. If the reflection parameters represents the input/output impedance of the network, looking to the markers we have:
m1: f=900MHz, Z1=29+j22.5 (~ as expected)
m2: f=900MHz, Z2=66-j43,5
Considering ideal components in simulation, why the marker 2 (m2) is not in 50ohms?