I’m getting to the point on my board I need to choose antenna connector. (UFL, SMA)…
A few things going thru my mind and going to ask what would you guys think !
I have this board that I’ll be placing in a Hammond enclosure.
I need to make 50ohm traces for my antennas
Trying making the BOM smaller, I would use a SMA connector directly on the edge of the board.
good thing is that I do not have to worry about small UFL connector and coax cable inside my case(reducing the BOM).
but I’ll have to manage the hole on the case and it will have to be larger than the SMA connector and I don’t ever saw a model like it that will be able to add a nut on the outside to make it sturdy and prevent dust to enter the case.
also, all pressure applied to the antenna will be directly to the board…
easy route would be to use
but I feel like that connector(UFL bord side) is flimsy and I will never remove the cable from the board… ever.
so I searched and found this; LINK
I’d use a SMA footprint and place it a bit more off the edge of my board to solder directly the cable to the board and have a big SMA connector on the case strongly attached with two nuts and locktite.
this way most (if not all) my issues are fixed, smaller BOM(not that much), stronger connector, no dust infiltration, no possible damage to board by antenna…
what do you guys think ?
looking at the application note of my chip, it seams that they are adding capacitors ‘PI Matching’ if using external SMA…and it looks like making 50ohm trace is a bit complex. but my board is very small and the antenna connector should be a few mm away from the chip output… is this so complex ? -where can I start with simple info on making my +/- 10mm trace 50ohm… ( I do more search and look into PCB calculator ) but I feel like it should be simple ?!