# Impedance matching for ESP32-D0WD-V3 QFN 5x5 connected to uFL port

I'm designing a PCB that uses a ESP32-D0WD-V3 QFN 5x5 and I want to have a uFL port for 2.4Ghz Wifi/BLE. Directly from the datasheet, I get the following note:

The output impedance of the RF pins of ESP32 (QFN 6x6) and ESP32 (QFN 5x5) are (30+j10) Ω and (35+j10) Ω, respectively. A π-type matching network is essential for antenna matching in the circuit design. CLC structure is recommended for the matching network.

Following the datasheet, I went into https://www.omnicalculator.com/other/impedance-matching and filled the blanks like so:

Results of the calculator

Resulting schematic

I have no experience with RF design or impedance matching. Can someone advise if my steps are correct and give some pointers into what can I improve?

• I get the same sort of capacitor and inductor values for the pi network using my calculations. This assumes that the antenna is of course 50 ohm and not more complex. Dec 10, 2021 at 19:01
• @Andyaka Thank you. Yes, I'm planning to run 50-ohm antennas. Dec 10, 2021 at 19:37

Of course if all the relevant components are really "close" together (approximately $$\ \leq0.1\lambda\$$), this becomes less of an issue.