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otakung
Joined: 14 Jan 2003
Posts: 31
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 01 Dec 2003 5:19 information about antenna design for contactless smartcard? |
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where can I find information about antenna design for contactless smartcard? Any web link or document to download. thank you 
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 01 Dec 2003 5:20 Re: information about antenna design for contactless smartca |
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| These are mostly inductive pickup. The manufacturer of the IC you use will have detailed information on the coil. This is because it has to have a very specific inductance for their IC system to work optimally.
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Element7k
Joined: 07 May 2003
Posts: 388
Helped: 8
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| 01 Dec 2003 11:00 Re: information about antenna design for contactless smartca |
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Hi,
I was just wondering if these are similar to RFID?
Element7k
| flatulent wrote: |
| These are mostly inductive pickup. The manufacturer of the IC you use will have detailed information on the coil. This is because it has to have a very specific inductance for their IC system to work optimally. |
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cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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| 04 Dec 2003 1:32 Re: information about antenna design for contactless smartca |
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| Are you talking 13.56Mhz contactless card or 900Mhz RFID?
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pewang
Joined: 19 Feb 2003
Posts: 139
Helped: 1
Location: China PRC
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| 04 Dec 2003 2:10 |
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| Can anybody explain 13.56MHz cantactless application?
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flatulent
Joined: 19 Jul 2002
Posts: 4856
Helped: 292
Location: Middle Earth
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| 04 Dec 2003 2:56 smart cards |
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Smart cards are inductive pickup mostly at 13.56. They rectify the picked up field to power the electronics and then add an extra load of current which is sensed by the reader. The pulsed load is frequently a digitally modulated square wave carrier and well under 13.56. They use the 13.56 to synchronize the sending which makes the system optimum in that it is synchronous.
Smart cards once were contact, but the gold in the contacts added 1 euro to the price.
If you hold a card up to the light you can see the IC in the corner and the wire coil around the edges a few mm in.
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otakung
Joined: 14 Jan 2003
Posts: 31
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| 04 Dec 2003 3:12 |
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yes, I mean 13.56MHz.
How is the difference between RFID and contactless technology?
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AL0117
Joined: 25 Jul 2003
Posts: 230
Helped: 8
Location: dracu-la-nd
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| 04 Dec 2003 8:41 Re: information about antenna design for contactless smartca |
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If you are interested, here is a link for an article by James Rautio from Sonnet:
Electromagnetic Analysis Speeds RFID Design
This article, by Dr. James C. Rautio, describes how to use Sonnet to design Radio Frequency IDentification (RFID) tags. In this extremely competitive and dynamic market, getting the best and most innovative products to market before the competition is absolutely critical to survival. This paper shows how to use Sonnet for a complete and accurate analysis of the reader-coil pair in minutes, allowing dozens of designs to be considered in a single day.
This paper was first published in the February 2003 issue of Microwaves & RF magazine
hxxp://www.sonnetusa.com/support/downloads/publications/RFID.zip
(x=t)
You also can look for the original article in MWRF.
Search for appnotes at the chip manufacturers website (Temic/Atmel, EM Marin, etc)
regards, Al
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cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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| 05 Dec 2003 1:12 Re: information about antenna design for contactless smartca |
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for 13.56M contactless smartcard, the inductance, capacitance value and area of the coil are three importance parameters. These determine the power reception by the smartcard, care:
1. f0=1/(2*pi*(L*C)^1/2), this C include the parasitic capacitance of the antanna, package cap and the equivalent cap of IC input port.
2. because antenna of smartcard is often smaller than reader's antenna, more area, more mutual inductance, so more power transmitting.
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cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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| 05 Dec 2003 1:16 Re: information about antenna design for contactless smartca |
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I think this book must be very useful for you:
RFID Handbook : Fundamentals and Applications in Contactless Smart Cards and Identification
by Klaus Finkenzeller (Author)
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