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<html> <head> <title>RFID-Bulletin Board: Re: About the energy, Klaus Finkenzeller at 9/21/2001 12:05</title> <!-- Anfang Header --><!-- Ende Header --> </head> <BODY BGCOLOR="#fffcf4"><!-- Anfang BeitragsseitenKopf --><!-- Ende BeitragsseitenKopf --><!-- AnfangBanner --><!-- EndeBanner --> <blockquote> <center> <h1>Re: About the energy</h1> </center><!-- Anfang BeitragsNavigationsLeisteOben --><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><center><P><B>[ <a href="../index.htm">RFID-Bulletin Board</a> ]</B></P></center><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><!-- Ende BeitragsNavigationsLeisteOben --><p>Written by <a href="mailto:klaus.finkenzeller@web.de">Klaus Finkenzeller</a> at 21 Sep 2001 12:05:27:<p>As an answer to: <a href="480.htm">About the energy</a> written by Youqing at 21 Sep 2001 10:13:56:<p>Hi Youqing,<br>>who can tell me how much energy the card will get from the Reader?<br>This can not be answered in one sentence without knowing the following parameters:<br><li> frequency (125 kHz, 13.56 MHz, 2.45 GHz, ....)?<br><li> antenna of the card (turns N, area A for < 13.56 MHz, Gain and Rs for > 433 MHz; <a href="http://rfid-handbook.com/rfid/types_of_rfid.html">see here</a>)<br><li> fieldstrength H or E at the cards prosition<br><li> required voltage and current of the chip to operate, as the available power depends on the load resistance (strong influence to the Q factor: the power for an inductive coupled system is u^2 / RL where u = f(RL,A,N,H,L_coil,R_coil,C_chip)!!!)<p>With best regards<br>Klaus<p>Please have also a look onto <a href="http://rfid-handbook.com/chinese/contents_chinese.html">my homepage :-)</a><br><br><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><form method=POST action="../wwwforum.cgi?formular"><input type=hidden name="followup" value="480,481"><input type=hidden name="origname" value="Klaus Finkenzeller"><input type=hidden name="origemail" value="klaus.finkenzeller@web.de"><input type=hidden name="origsubject" value="Re: About the energy"><input type=hidden name="origdate" value="21 Sep 2001 12:05:27"><input type=hidden name="subject" value="Re: About the energy"><input type="submit" name="abschicken" value="Write an answer"> <br><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><p><a name="followups"><B>List of answers:</B></a><br><ul><!--insert: 481--></ul><!--end: 481--><!-- Anfang BeitragsNavigationsLeisteUnten --><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><center><P><B>[ <a href="../index.htm">RFID-Bulletin Board</a> ]</B></P></center><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><!-- Ende BeitragsNavigationsLeisteUnten --></blockquote> <!-- Anfang BeitragsseitenFuss --><!-- Ende BeitragsseitenFuss --></body></html>⌨️ 快捷键说明
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