Re: material for inductive loop
> Dear Group,Funny - I was just doing that for a customer a couple of minutes
> I am designing an inductive loop antenna for an 13.56 MHz RFID
> application. (I will probably have the loops etched onto a pcb)
ago! First of all - resist the temptation to go too narrow on the
PCB traces to get the Q down. You can trim the Q with a resistor in
parallel. Secondly, make the loop as large as you possibly can.
These magnetic loops are very inefficient as it is due to their
small dimensions. Couple that with the low Q's required for this
sort of thing, and you have one really lame antenna. Of course all
you want is a few inches most of the time, but more range / better
reception is almost always desirable.
Matching always comes up - don't. Do a good loop design, tune it
with your receiver board and cable attached and powered up. I have
some really good strategies for tuning without the measuring
instrument affecting the tuning - if you aren't a competitor or
something I'll be happy to share with you.