I’m trying to understand how the matching network functions on the radio side of a transmission line. As an example, here’s an excerpt from the Nordic nRF52840 DK schematics. As I understand it, when the radio is receiving, matching network B transforms the antenna impedance to 50Ω to match the 50Ω microstrip transmission line “TL”. Matching network A then transforms the radio to a 50Ω load for maximum power transfer. So far so good.
What happens when the radio is transmitting? The transmitter output impedance would be low to minimize power loss. How does it get matched to the transmission line? How do we avoid having to toggle between two different implementations of matching network “A”, one for receive, one for transmit?