About RFID. How to choose the right technology.

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Hi group,
I'm gonna make a little setup, where I'm going to detect some transponders
at 50cm distance.
I've been looking at Texas Instruments RFID technologies, and it seems very
easy to use, but I do have one problem: They have a 134KHz system and a
13MHz system, and despite the fact that I've searched in all documents, I
still havent found a good table with pros and cons.

So, which system / frequency to choose, and why?

Thanks in advance
Adrian Hjelmslund

 

check out MicroChip's rfID line. you might find better docs.

brs,
mike

 

I've just gone through all this process of selecting an appropriate
frequency for a couple of projects I'm working on. In simple terms,
the higher the frequency the further the reader/interrogator will
detect a transponder. The four basic bands are 125kHz/134KHz,
13.56MHz, 400MHz-900MHz, 2.4GHz and, of course the higher the
frequency the higher the price! There are caveats. Higher frequencies
are less tolerant of water containing obstacles (eg people, humid air,
etc) and generally prefer line of sight. My requirements are up to
90cm and I've selected 13.56MHz as it is quite practical to design
your own reader/interrogators using uPs and a 13.56MHz crystal. I
concur with Mike that the MicroChip web site offers some of the best
research info including schematics and source code for their
development kits.

Andrew