I'm working on RFID project . and I want to design the reader antenna at 13.56MHz to transmit and read at maximum range 1.5 m to passive tags .

if someone can provide me with proper equations to calculate inductance of the coil to be 0.225μH .

 

A single layer coil, length,l, & radius,r, N, no of turns,. can be calculated: L=[ rN ]squared /9r +10l. If r=.75, l=.1, N=2, then L about .29 uH. Spreading turns will reduce L. Allied Radio 1960

 

thank you Bernard.
but what's the unit of l & r .
and can you provide me with any useful links.

 

Sorry- it is inches. I'll try to post page-best I can do.

 

Hello,

Take a look at the following link:
http://www.skyrfid.com/RFID_Antenna_Tutorial.php

Also I have attached a PDF with some info.

Bertus