Need Help about Bypass Capacitor RF Power Amplifier

Hi all, I want to design a RF power amplifier using Doherty configuration. At each of the main and peak amplifier, I intend to make a bypass circuit in order to allow high-frequency go to ground (so not disturbing the power supply and output port). Here is the detail of the circuit I'm about to design :

I adapt the circuit from NXP Application note.

My question is, what is the line between the the drain and the bypass capacitors (those I circled red in the picture)?
Is it a microstrip line of certain Width and Length? If the line has some purpose, how do I calculate the right W and L in order to conform with the purpose?
Thank you. I appreciate your help.