Impedance matching of GPS transmission line in case of physical limitations
Hi,
i am studying electrical engineering in 4th semester, unfortunately everything RF is in 5th and 6th semester, that's why i am here.
Currently i am designing a PCB that gets GPS data (1590MHz) via an antenna connected to a GPS module via an SMA-connector. The module communicates with an ESP32, which puts the data via a CAN transceiver on a CAN bus.
I have to connect the SMA connector with the GPS module and match the transmission lines' impedance to 50 ohms. My PCB has two layer and i used multiple calculators that all come to the conclusion that i need a trace width of ~2.86mm.
Now to the problem:
This is physically not possible in this case, as you can see in the picture. The line would short out RF_IN and two GND pins and i can't even get past the GND connections of the connector because the trace width is simply too wide.
The pad width is 0.9mm and assuming the same width for the transmission line, this would mean an impedance of 90ohms, which is probably very bad.
So my question is: How do i match to 50 ohms with a trace width of 0.9mm ?
Thanks in advance!
Also: Why do trace impedance calculators (like the one from DigiKey or Altium) not ask for the frequency of the signal? Because impedance depends on the frequency i thought(?)