Using RFID to scan mulitple tags on a body...Finding the appropriate Reader.

Hi All,

I'm relatively new to the world of electronics and I'm currently having some difficulties finding the appropriate hardware for a project I am working on.

I would like to use a PIC to control an RFID reader. This reader needs to grab information from RFID tags that will be placed upon someones body when they walk through a door way.

So the reader needs to be able to read multiple tags up to 3ft away and be able to talk to a PIC (Possibly 16F819).

Firstly, I currently can't find any available RFID readers with these specs (If anyone can that would be great) so I was thinking about creating my own? How difficult would this be to create one of the spec I require?

Secondly, I believe there could be problems reading multiple tags if they are on a persons body at different angles and positions? Would I need to use multiple readers?

Thanks in advance for any help.

Luke

As a first step, you should study the specifications of existing RFID standards. You'll notice that all are prepared to perform an anticollision protocol, selecting one of multiple tags present in the operation volume. Depending on the operation frequency and respective antenna/coupler dimensions, the tags are also designed to allow the operation of multiple devices close to each other, because it's a requirement of many applications.

Intended operation distance restricts the selection to vicinity RFID standards, e.g. ISO 15693 respectively 18000-3 (13,56 MHz) as well as UHF and mcirowave RFID.

Since u are new to the electronic world, forget about making a reader by yourself. Considering the distance requirement, it is suggested to use a UHF RFID system. Careful selection of tags is needed in order to maximize the tag performance when they are mounted on human body. Multiple reader antennas can be connected to a reader to cover the intended read zone better. However the exact installation of the reader antennas depends on the potential positions where tags are placed on human body.