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<html> <head> <title>RFID-Bulletin Board: Re: Long range read passive tags., Jeremy Nysen at 10/26/2000 01:36</title> <!-- Anfang Header --><!-- Ende Header --> </head> <BODY BGCOLOR="#fffcf4"><!-- Anfang BeitragsseitenKopf --><!-- Ende BeitragsseitenKopf --><!-- AnfangBanner --><!-- EndeBanner --><blockquote> <center> <h1>Re: Long range read passive tags.</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:jn@triaptic.com.au">Jeremy Nysen</a> at 26 Oct 2000 01:36:17:<p>As an answer to: <a href="200.htm">Long range read passive tags.</a> written by Ray Floyd at 25 Oct 2000 16:47:31:<p>> One problem is in the definition of "passive" versus "active".<br>> One common approach is that "passive" is equivalent to "back<br>> scatter", while "active" means an active transmit function.<p>Back scatter modulation can be either passive or active. It is<br>passive in systems where no semiconductor based signal amplification<br>takes place in the tags, eg XCI. And it is active where additional<br>amplification is used to boost the signal (either by using a battery<br>or rectification of the incoming RF), eg Amtech.<p>> second approach means that "passive" has no battery, while<br>> "active" may.<p>This is probably the most common definition amongst end users.<p>> Amtech, among others, can detect "passive backscatter" tags<br>> with a battery to about 200 feet.<p>This would be better defined as "active backscatter".<br><br><br><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><form method=POST action="http://f16.parsimony.net/forum26490/wwwforum.cgi?formular"><input type=hidden name="followup" value="200,202"><input type=hidden name="origname" value="Jeremy Nysen"><input type=hidden name="origemail" value="jn@triaptic.com.au"><input type=hidden name="origsubject" value="Re: Long range read passive tags."><input type=hidden name="origdate" value="26 Oct 2000 01:36:17"><input type=hidden name="subject" value="Re: Long range read passive tags."><input type=hidden name="body" value=">> One problem is in the definition of "passive" versus "active".>> One common approach is that "passive" is equivalent to "back>> scatter", while "active" means an active transmit function.>Back scatter modulation can be either passive or active. It is>passive in systems where no semiconductor based signal amplification>takes place in the tags, eg XCI. And it is active where additional>amplification is used to boost the signal (either by using a battery>or rectification of the incoming RF), eg Amtech.>> second approach means that "passive" has no battery, while>> "active" may.>This is probably the most common definition amongst end users.>> Amtech, among others, can detect "passive backscatter" tags>> with a battery to about 200 feet.>This would be better defined as "active backscatter"."><input type="submit" name="abschicken" value="Write an answer"> <br><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><p><a name="followups"><B>Answers:</B></a><br><ul><!--insert: 202--></ul><!--end: 202--><!-- 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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