Questions regarding nrf5340 CLAA matching network and transmission line

[maxter]

I have some questions regarding the RF path of nrf5340-CLAA (WLCSP package):

1. The impedance of the transmission line in the reference design, as calculated using AppCAD, is approx. 70 Ohm instead of the expected 50 Ohm. Is that intended? If yes, what's the rationale?

2. What's the minimal length of the transmission line?

3. If I am not intending to use any PCB antenna, can the transmission line be omitted entirely and the connector for an external 50 Ohm antenna be connected directly to the output of the filter?

[ketiljo]

1. This is an error, it shoyld be 50 ohm

2. There's really no minimum length here. But at some point it's not possible to make a transmission line to better to make the design more compact and omit the transmission line.

3. Yes, this is preferred.