Formulas & Data:
- Electronics
- Mathematics
- Physics
- RF & Microwaves

Parts Vendors:
- all hand-selected

- Amateur Radio
- Vintage Articles:
- Electronics World
- Popular Electronics
- Radio & TV News
- Radio Craft
- Short Wave Craft
- Wireless World

- Events Calendar
RF Cafe Homepage
Copyright 1999-2015   •−•  ••−•    −•−•  •−  ••−•  •   "RF Cafe" in Morse Code  >> Listen to It <<
- EW & Radar Handbook
- Quizzes       - Software
- App Notes
- Calculators
- Advertise on RF Cafe
- About RF Cafe™
- RF Cafe Shirts & Mugs
- RF Cafe Archives
RF Cafe Book Contest
- RF Cafe on Visit RF Cafe on Facebook Visit RF Cafe on Twitter Visit RF Cafe on LinkedIn
- Tech Humor
- Forums Archive
- Job Board
- Donate to RF Cafe
- Kirt's Cogitations
Custom Search
More than 10,000 searchable pages indexed.
Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it here. Thanks!

how to make a passive RFID tag ? - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

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:

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: ... 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

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website