I am prototyping an RFID system that would use multiple antennas and a single reader. The entire system would be controlled by mBed. The problem that i am facing is, how to mutiplex the various antennas with the single reader. The reader is using 125KHz and the antennas are simple coils.
Initially i tried a mutiplexer (https://www.sparkfun.com/products/299) but there seems to be very poor isolation. The RFID reader picks up antennas that are actually off. i.e the mux leaks signals into the channels are in OFF state. (i guess this is due to stray capacitances in the MUX Ic)
Doing a bit of googling yielded something called RF switches, which i guess are meant for antenna switching. They promise good isolation and cross-talk inhibition.
A few examples are:
http://www.analog.com/en/rfif-components/rf-switches/adg901/products/product.html
http://www.nxp.com/products/rf/switches/SA630D.html#overview
Now, can someone tell me if i am on the right track here? i.e using these RF switches to mutiplex several antennas to my single reader. I do not want to end up ordering a bunch of material that wont be useful.
Any help is greatly appreciated.
I am prototyping an RFID system that would use multiple antennas and a single reader. The entire system would be controlled by mBed. The problem that i am facing is, how to mutiplex the various antennas with the single reader. The reader is using 125KHz and the antennas are simple coils.
Initially i tried a mutiplexer (https://www.sparkfun.com/products/299) but there seems to be very poor isolation. The RFID reader picks up antennas that are actually off. i.e the mux leaks signals into the channels are in OFF state. (i guess this is due to stray capacitances in the MUX Ic)
Doing a bit of googling yielded something called RF switches, which i guess are meant for antenna switching. They promise good isolation and cross-talk inhibition.
A few examples are: http://www.analog.com/en/rfif-components/rf-switches/adg901/products/product.html http://www.nxp.com/products/rf/switches/SA630D.html#overview
Now, can someone tell me if i am on the right track here? i.e using these RF switches to mutiplex several antennas to my single reader. I do not want to end up ordering a bunch of material that wont be useful.
Any help is greatly appreciated.