Thank you
________________________________
From:
[email protected] <
[email protected]> on behalf of Jim Lux <jim@...>
Sent: Wednesday, June 15, 2022 6:45 PM
To:
[email protected] <
[email protected]>
Subject: Re: [nanovna-users] NanoVNA for RFID design
On 6/15/22 9:39 AM, Chuck, KF0CT wrote:
But why would anyone want an RFID reader that can read cards over 10" away except to read someone's Credit card or Debit card without the person knowing about it... then you just watch them type in their pin number and you have complete access to their credit/debit card....
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A good use case is where you use the badge to authenticate into a
computer (using an actual contact badge reader that uses the
cryptographic chip in the badge), but then just need to make sure that
the user is in the vicinity. If you require the badge to be resident in
the computer, it makes it hard to use multiple computers at the same time.
A typical PIV-II credential has both an RFID (which returns only the
serial number of the badge) and an actual chip (like in a credit card).
ISO14443A/B ISO ISO15693 are two of the specs
ISO/IEC 15693 systems operate at the 13.56 MHzfrequency
<>, and offer maximum read
distance of 1¨C1.5 meters
They do both ASK and FSK.
As far as NanoVNAs go, it's a useful tool to develop and test these kind
of systems - 13.56 MHz is easily choked with ferrites to remove the
cables and instrument from interacting with the system. So you can set
up a test card (which has the antenna, but a SMA or MMCX connector on
it) and a test reader (just the antenna, with connector). And this is
at a frequency for which the NanoVNA is perfect. You can easily set up
a scripted environment, have a user wearing the badge on a neck lanyard
and move around while logging S21.
