File:ProximityCard 1.jpg
No file by this name exists.
Summary
[edit | edit source]
| 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) |
|---|---|
| Source |
I created this work entirely by myself. |
| Date |
20/09/2008 |
| Author | |
| Permission (Reusing this file) |
See below.
|
Licensing:
[edit | edit source]
If this is not legally possible:
Any user may perform this transfer; refer to Wikipedia:Moving files to Commons for details.
If this file has problems with attribution, copyright, or is otherwise ineligible for Commons, then remove this tag and DO NOT transfer it; repeat violators may be blocked from editing.
- Endorse this file for transfer by adding
|human=<your username>to this Template. - If this file is freely licensed, but otherwise unsuitable for Commons (e.g. out of Commons' scope, still copyrighted in the US), then replace this Template with
{{Do not move to Commons|reason=<Why it can't be moved>}} - If you think that a local copy of this file should be retained, then replace this Template with
{{Keep local|reason=<Why a local copy is needed>}} - Please ensure that the file has a properly descriptive and unambiguous name before transferring; see Wikipedia:File mover#What files should be renamed? for details.
File usage
The following page uses this file:
