Active RFID + antenna

Projects General Guidance
1

Hi,

I've been googling for a while but I have not found anything about DIY Active RFID.

I understand the general theory; how do active transponders work, differences between passive and active, etc.
I am looking to concrete all that general info into specific components.

What am I building?

  • System that tracks objects when cross some specific point, let's call it 'finsih line'

As far as I know,

  • Each object will have an active rfid transponder
  • The finsih line will have an antenna on the ground.
  • Active Rfid Reader will get what is crossing the 'finish line'

What do I need?

  1. Specific active rfid reader module, if it have a complete datasheet, much better.
  2. How is the system calibrated to get the exact moment the object cross the 'finish line'?
  3. The antenna is usually a mat wth the wires behind, any idea about those wires to just put them under the ground with out any mat.

I've seen a few tutorials about passive rfid systems, for running marathon races, but I need a higher accuracy in timing than those.

Thanks :slight_smile:

2

In order to use Active RFID (this means the chip / antenna combination is battery powered) (active)

the average UHF 902-928 Mhz RFID tag is passive, it gets its power to broadcast from the antenna at the finish line etc. This makes the RFID component less expensive, and lighter etc.

Robert Dingus

3

However the accuray is less. I am looking for 1/100s, and as far as I know, the passive ones can't.

Robert_Dingus:
In order to use Active RFID (this means the chip / antenna combination is battery powered) (active)

the average UHF 902-928 Mhz RFID tag is passive, it gets its power to broadcast from the antenna at the finish line etc. This makes the RFID component less expensive, and lighter etc.