Hi
I am usig a nRF52840 with the chip antenna 2450AT18D0100E (Johanson Technology).
How should I calculate the matching filter? I used the values from the reference design, but the smith chart and return loss diagram are showing some really bad and not matching results for the BLE function.
the Altium file is in the zip file
Here are the plots from the antenna without additional components
Here are the plots from the antenna without additional components
this is the measurement without matching componets, only the antenna and the 0Ohm resistors until the ant pin of the nRF
a 0.5pF in series and 4.7nH shunt gives this diagram:
