I'm trying to design a simple RF Antenna Switcher, I'm new to RF design.
I want a 50 Ohm controlled impedance trace between my Antenna connector (IPEX 20579-001E) and an RF Switch (BGS12P2L6)
I've been speaking to a PCB manufacturer, to determine the exact trace width to achieve 50 Ohms, given their PCB specifications.
I didn't want the trace width to be too thin, as manufacturing tolerances would impact the target 50-ohm impedance too much:
- Bad: a 0.1mm trace with 0.01mm manufacturing tolerance (10% error)
- Better: a 0.5mm trace with 0.01mm manufacturing tolerance (2% error)
So my question...
The PCB manufacturer mentioned:
"Because the impedance line is short and in the pad, it will cause dielectric losses."
Is my approach for the highlighted microstrip trace (polygon) correct? Please see the images below
- The connector pad is essentially the same width as the desired 50 Ohm trace
- The RF Switch pad is much smaller, so I have tapered the polygon as it approaches
- I've tried to place the connector and switch as close to as possible
- I've read that it's beneficial to remove the trace solder mask, to reduce dielectric losses
I'm aware of coplanar waveguides, but I have read they have higher losses at my frequencies of interest, a 5G antenna, up to 6 Ghz.
Any help is appreciated! : )