Why is the frequency of 58 kHz used in acousto-magnetic anti-theft systems?

[Zilfarion]

I was wondering why manufacturers only makes these anti-theft systems send out a frequency of 58 kHz. Is there something that will change in the system if we make the frequency higher or lower? Always been wondering that and if 58 kHz does end up being a limit, then why is it one?

I might use this as a project demonstration we have to do for my college, but I just wanted to make sure that it's of a significance for me to delve deeper into. I already did the basic research on how the EAS works, but this is one thing I haven't found or been able to figure out myself.

Any help would be appreciated and if this doesn't work out, I'll just look for another project to do. Don't have much inspiration at the moment so if you can suggest something to than that will help me out too =3.

 

[Andy Resnick]

That's an interesting technology- I haven't heard of it before. Very clever. Nice choice of topic.

58 kHz is likely a standard, created by the main manufacturers of the detection system. Since the bars have to be resonant with a particular frequency, and there are many different manufacturers of the tag, everyone needs to standardize the design. I don't think there is anything magic about 58 kHz.

 

[Zilfarion]

Hmm, I guess so... Guess I can't really do much about this as a project then, unless I find something else to concentrate on. But I'll still search a bit more until I really can't find anything cause I seriously can't think of another project that I might be able to do. Thanks for the small tidbit of info though