rfid tag
Hi,
you must search for "planar coils"...
Typically has a Transmitter some value at 0.5- 1 uH, the Receiver at 1.5-2uH, but the dimensions are very different depending of your envyronment...
What means "small dimensions" pls?
K.
Added after 35 minutes:
>you must search for "planar coils"...
And for spiral coils/inductances too.
Added after 33 minutes:
For small ones (measures such mm) is surly correct:
L=(14 . 10^-7)N2 and multiplyed by the product of (Router+Rinternal)2,divided by 2.14 . Router-Rinternal.
From:
S.Butteworth: Effective Resistance of Inductance Coils at Radio Frequency. ,1926, pp203-210
& ISBN 3-89649-430-9,Passeraub: An Integrated Inductive ProxySensor, pp44.
Added after 4 hours 4 minutes:
Hi sabirah,
you can find good calcution methods & RFID generell guides in "MicroID 13.56MHz RFID System Design Guide" from MicroChip.
https://ww1.microchip.com/downloads/en/DeviceDoc/21299E.pdf
Sorry I can not download some things today fro server ww1.micrchip...
I have a printed exemplar of the 125KHz version, you have in this the COIL CALCULATION formulas on pp50-66 BETTER (more detailed)as in the 13.56MHz script, but both application notes called AN 710(good the one better is exactly: AN710 microID 125KHz Design Guide _the other only simple=AN710!!)...
K.