So I’m well aware that an active tag would not be something you’d want implanted, batteries potentially having trouble inside of you and all that. That being said I’m trying to find a way to significantly increase the read range of a low frequency card or fob without modifying the reader and while still making the card or fob reasonably small. It doesn’t even have to be the original since we can setup a t5577 to cover almost all of the 125k cards I’ve run into.
Anyone got any ideas or a piece of hardware that can push the same signal that a low frequency card would?
Okay so, on the NFC side of things, there are such things as booster chips. The idea is that they go between the NFC chip and the antenna and they have an external power source connected to them which is used to boost the chips interaction with the reader. It works very well, but of course the problem is batteries. That said, there have been examples of booster chips connected to a secondary coil. The secondary coil simply inducts power to energize the booster chip. The advantage to this is that this secondary coil does not need to be able to communicate data. Therefore it can be a high Q antenna that is great at power transfer but not great at modulation. Then, the communication coil can be very low Q to be able to maximize data transmission with the help of the booster chip even though it doesn’t induct power very well.
Unfortunately I’ve never seen this type of setup or chip available for a low frequency applications.
Not to mention that one reader will be used on lots of tags so a $200 cost increase there for significantly increased range will be easier to justify, but if you increase the cost of a 50¢ tag by 20¢ that is going to be a lot harder to sell.