1mx1m Copper Tube Antenna for read range of 1 meter

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newbie007

Joined: 24 Jul 2008
Posts: 9

25 Jul 2008 21:52 1mx1m Copper Tube Antenna for read range of 1 meter

so i have made a copper tube antenna that has dimensions of 1m x 1m with a thickness of an inch. The antenna is tuned for 13.56Mhz i know it works because i used a spectrum analyzer and it detects the antenna. What i want to know is. with this antenna design, am i able to achieve a 1 meter read range with passive RFID tags ?

I'm thinking i need to input at least 8 watts of power to the antenna.

thanks.

Eugen_E

Joined: 29 Nov 2004
Posts: 358
Helped: 31

25 Jul 2008 22:26 Re: 1mx1m Copper Tube Antenna for read range of 1 meter

The power is limited by the spectrum regulations, and I think 8W is way too much.
This kind of magnetic antenna is used by radioamateurs not having enough space for a full size antenna. l remember in radioamateur handbooks it said it's not safe to stay near a magnetic antenna during tranmission - at least a few meters.

The antenna appnotes for magnetic antennas say distance=coil radius and this is true for usual size centimeters.
However this is true because the antenna and card/transponder size are quite compatible and the coupling is good. The card is much smaller than 1m, so in this case the coupling may be inefficient, only a small part of the energy will intersect the card. Also the effect of the card modulation would be hard to observe on the powerfull antenna signal - the receiver coupling is problematic because of high power.