what's the purpose of this microstrip track on a RF PA evaluation board?

[liyuqihxc]

I'm building a RF amplifier for CC1101 using PA2460.

There is an evaluation board layout in amplifier's datasheet.
https://www.princeton.com.tw/Portals/0/activeforums_Attach/PA2460.pdf

What I don't understand is the purpose of the following microstrip track (ML1), is it used as an inductor with C11 and C12 to form a pi filter? If so, can I replace it with an inductor?

Here is the layout of the board

[CaptDon]

Looks like a standard Pi impedance matching circuit. Not really a filter.

[liyuqihxc]

thanks for the reply.
The reason I ask this question is that I want to know how to modify the design if I use a different board (like a 4-layer board). The evaluation board layout is on a 2-layer 1.2 mm FR4 board. Using components like inductors is clearly more flexible compared to a trace on the PCB.
The datasheet doesn't specify the frequency range for the reference layout, but the amplifier IC operates in the 130 MHz to 500 MHz band. The amplifier module I want to build operates at 433 MHz.

[Neganur]

impedance match to 50 ohm, the chip itself is not an mmic.