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How to Make a Passive RFID Tag ? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Post subject: how to make a passive RFID tag ? Posted: Tue Jul 22, 2008 3:48 pm


Joined: Tue Jul 22, 2008 3:14 pm
Posts: 3
Hello, I am e new member and this is my first post .I have some question about RFID tags.Could you illuminate me?It's the first time I work with something like that and it is possible to write down something incorrect, so be prepared!

I have a project on building a passive RFID tag with CMOS technology and I need some help about the circuit design.could you propose some expectant circuit designs or some info and soutces to look for?

What I've found so far, is that my tag must include the following parts:
an antenna,a backscatter modulator, a demodulator, a voltage multiplier,a voltage regulator and a rectifier. Do you think I need some more parts?
Can anybody experienced help me find such parts? I need a simple circuit,so as not to be confused ,and I'll have to simulate every part of the tag seperately on a VLSI program afterwards.
Witch technologies can you suggest to base on?



Post subject: Posted: Wed Jul 23, 2008 4:10 pm


Joined: Wed Jun 20, 2007 3:01 am
Posts: 22
Dear iliana,

For thew antenna part, check this URL: http://www.maxource.com/html/RFID_antennas.html.

Best Regards,
imodelit Moderator


Post subject: Posted: Wed Jul 23, 2008 4:47 pm


Joined: Tue Jul 22, 2008 3:14 pm
Posts: 3
Thanks for responding, but with a quick view at it ,I think that this is not what I'm looking for.I want an antenna as a component of the RFID tag,so as to design it ,not the RFID reader antenna that detects the tags.It's so difficult to find the parts of the tag, bcause usually they buy it and do not deal with the design of the tag circuit...The only source I've got,is some papers of i-eee, though they are not always very detailed..


Post subject: Posted: Thu Jul 24, 2008 8:47 am
You might be interested on this book:

http://www.amazon.com/Design-Optimizati ... 589&sr=8-1

Take care


Post subject: Posted: Sat Jul 26, 2008 6:24 am


Joined: Tue Jul 22, 2008 3:14 pm
Posts: 3
Thanx FSomma .The index seems to be good,I'll order it.

Posted  11/12/2012

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