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Summary
edit| Description |
[A proximity card with the plastic casing opened to show components: wire antenna coil and integrated circuit (IC) (black object bottom center) Proximity cards are "read" by holding them close to a reader unit. The reader radiates an oscillating radio frequency electromagnetic field at 13 MHz. The coil antenna in the card is connected across a capacitor in the IC, making a tuned circuit. This tuned circuit absorbs radio energy by induction from the reader, oscillating in resonance with the field like an electrical version of a tuning fork. The alternating current from the tuned circuit is rectified to DC and powers up the chip. The chip sends its coded data to the coil antenna which transmits it back to the reader unit. ] Error: {{Langx}}: text has italic markup (help) |
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| Source |
I created this work entirely by myself. |
| Date |
20/09/2008 |
| Author | |
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| current | 12:29, 29 September 2008 | | 818 × 672 (52 KB) | Arkrishna (talk | contribs) | {{Information |Description= Anatomy of Proximity Card |Source=I created this work entirely by myself. |Date= |Author=~~~ |other_versions= }} |
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