Hi!
I'm new to building RF stuff and I need a bit of help for matching the 50
rule.
I have chosen the CMWX1ZZABZ-091 module that will run LoRa at 868MHz.
For the antenna I have chosen this one:
http://www.farnell.com/datasheets/2280483.pdfI have copied the antenna footprint with all the dimensions required.
1. In the datasheet it says that it is highly recommended to add a pi-network, which I have added. Do I have to use the values that are given in the datasheet? (by have to use I mean do I have to solder them)
2. I want to a use a FR4, 2 layer board, made by aisler.net. I have calculated the trace width and clearance via kicads calculator:
. I'm not sure if I did it right, can I get confirmation on it?
3. The calculator says that I need a 1.05mm width trace, but for the module used (CMWX) I can't directly connect the 1.05mm trace to the pin, because the pins width is 0.7mm... what should I do?
4. Should I use it without the bottom ground plane? The calculator (if I use it right, not sure) gives me this:
5. I don't have the right instruments at hand to properly match the impedance. What is the best recommendation for newbies to match the impedance?
Cheers!