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Chuck, Take a read of Bob Witte’s measurement equipment books, written when he was at HP. Joe Carr’s tests and measurements book is another one rendering a cogent treatment of measurement errors

If you need 10"+ reliably, use the 950 MHz or 2.45 GHz system at lower power, not these inductively coupled systems. Dave - W?LEV

The whole goal of the LF inductively coupled RFID systems is very short range. 10" is a stretch for these systems in normal applications. If you want more range, make the coils physically larger while

Yep! That's in an MF ISM band. If one has a Metcal soldering implement, it also operated in this band. Those having a TinySA, this offers an easy "target" for checking MF operation. Dave - W?LEV --

Thank you ________________________________ Sent: Wednesday, June 15, 2022 6:45 PM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] NanoVNA for RFID design A good use

Exactly - there are document management systems that put RFID stickers on each page or folder of the paper document (think mortgages and similar docs).? Then they have a reader that goes in front of

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

TY ________________________________ Sent: Wednesday, June 15, 2022 5:04 PM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] NanoVNA for RFID design Things like

RFID expert here. I had a quick look at the AN. It is quite complex to grasp in 60 seconds. I did some 13.56 MHz antenna design before, but these were all for a 50 Ohm system impedance, so you can

Things like automated package/baggage sorting use RFID at times, and distances to objects on a moving belt canrequire this kind of reach. - Tim

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

True. Antenna is a misnomer, and the tag and reader coils act together as a 'loosely coupled transformer', I think is a proper term. And yes, the ISO 15693 standard includes a 13.56 MHz carrier. The

Hello all of you, Op za 11 jun. 2022 om 22:11 schreef Victor Reijs < pe1atn.victor.reijs@...>: Here is my web page on my experiences. I think S21 and Y21 methods look promising using my

Nice story on the history! I agree that the coupling for the RFID is acting more as inductive coupling. The frequency for the OP's system's carrier frequency is 13.56 MHz. This is the system that is

Thanks to DAve W0LEV and others for bring up the subject of error analysis and significant figures. My own background is like Dave’s; a physics degree in 1965. Our professor in senior labs was very

Dave, I don't normally post here (although I read everything via email). I just want to thank you for your very informative history of RFID. It's something I've worked with for a number of years but

I do not have a VNA. I rely on Rudy Severns, N6LF, for data. He recalibrated his VNA at the SMA connector, measured a short there, and now MA mode does not affect the file data. In addition, |S11| is

I am one of several engineers who worked for the company that originally introduced RFID to the world, AMTEK. They no longer exist as many start-ups go. The company was fresh off "The Hill", Los

Brian, As a reference point, when calibrated, the HP 8753D has a linear magnitude reflection uncertainty of 0.015 or so when the reflection magnitude is near 1. I am not sure if that means the

Settings: 401 points, 0.1-50 MHz, bandwidth 100 Hz, arithmetic 4X smoothing, power = 4 mA Brian