Hello,
I need to connect a Bluetooth RFIO to an SMA antenna connector so I suppose I will have to use a microstrip line how can I do it using Eagle? Thanks.
Just create a track of the correct width (about 0.1" for standard FR4) with a copper area on the other side connected to ground.
Thx man but the question is how to do it using Eagle
I don’t use Eagle, but I think you create the grounded area with a polygon. You should know how to place a track.
To create a ground plane in eagle. Draw a polygon and change it’s name to Ex: Ground.
Connect all your ground signals and then change the signal name to the same as the polygon Ex: Ground. Then hit ratsnest command.
Skolnik:
To create a ground plane in eagle. Draw a polygon and change it’s name to Ex: Ground.Connect all your ground signals and then change the signal name to the same as the polygon Ex: Ground. Then hit ratsnest command.
Well I am using SparkFun Eagle library wen I place the SMA_EDGE device on my board I have 3 pads I suppose I have to connect the middle one to the RFIO pin of the bluetooth device what about the others?
Ground them, of course.
So on the SMA_EDGE schematic I connect the 4 adjacent wires to GND and the circled middle wire to the RFIO? Or do I suppose to connect only 2 wires from the 4 to GND? In fact the schematic is not clear for me.
Post the schematic as a BMP or PDF.
This is the SMA_EDGE
Look at any of the schematics for Sparkfun products that use the SMA connector.
The two outer pins are ground, the central one is for the RF.
I have uploaded my SMA edge connector library for Eagle to my server. The symbol is simple, one connection on the left for RF and four on the bottom for ground.
Here is a quick example:
http://www.rpc-electronics.com/eagle/rf … ematic.png
http://www.rpc-electronics.com/eagle/rfdemo.png
Like Leon said, 0.1" or 2.54mm wide trace for the RF feedline for FR4 board. Draw the polygon around the edge of the board and remame it “GND”. Then click the ratsnest tool (X with five dots) to fill the polygon in. Make sure to add a polygon for the top AND bottom layers, since this connector has solder points on both sides.
Thanks a lot guys! What about the antenna matching circuit anyone can help me with that?
Thanks a lot guys! What about the antenna matching circuit anyone can help me with that?
What are you trying to connect? You only mentioned the SMA connector, not a matching network.
If you had problems with a microstrip connection, a matching network will be far beyond your capabilities!
Why don’t you try to help then ?
Have you actually done any RF design at that sort of frequency? If not, you are in for a lot of studying.