Anyone know an rfid system which has a range of >200m?

 

The transponders used in RFID are passive. They harvest energy from the interrogation pulse in order to send a signal back. So the inverse square law makes ranges of anything like 200m very unlikely.

 

Hello,

I think a range upto 1 m should be possible.
The frequency is also of influence of the range.
Here is an article on RFID and range:
http://www.rfid.com.sg/range.htm

An active system like GPS localisation will have an "unlimited" range.

Greetings,
Bertus

 

What about active tags? Or is that not considered rfid anymore? What system could I use for awareness recognition that spans up to 200m?

Thanks

 

Hello,

Active RFID tags will only manage 100 meters.
See the following links:
http://www.active-rfid.com/
http://www.gaorfid.com/index.php?ma...id=781&zenid=688fff5dce924cf0697f39f2d08c2421

Greetings,
Bertus

 

Don't the transponders used in aircraft meet that definition?

John

 

Ok. What could I use that has approx a 1 metre radius of detection?