[射频]DESIGN OF GLOBAL SAW RFID TAG DEVICES

Reprint from Proceedings of the Second International Symposium on Acoustic Wave Devices <ns[( Q  
For Future Mobile Communication Systems, Chiba University, Japan, March 2004 euM7> $`  
Page1 of 5 2O {@W +Mt  
DESIGN OF GLOBAL SAW RFID TAG DEVICES ll
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C. S. Hartmann, P. Brown, and J. Bellamy .-+_>br~  
RF SAW, Inc., 900 Alpha Drive Ste 400, Richardson, TX, U.S.A., 75081 ~.M{n&NM  
Abstract - The Global SAW Tag [1] is projected to be h&J6  
a large-volume SAW device application. The 0U]wEz*b  
modulation method and overall tag data structure are ahkSEE{  
reviewed for a family of proposed RFID devices. .ag4i;hS8  
Current implementations use a basic group structure 693J?Yah[  
that encodes 16 information bits using 4 reflectors V\@h<%{^%7  
chosen from 75 reflector slots. Several groups are KzZ! CB\  
placed in-line on a single acoustic track to achieve ID 6\)61o_1|  
tag devices with capacities up to 256 bits. RFID JwbC3t):@  
system requirements for anti-collision, low tag loss s bd;Kn  
and high tag accuracy are presented. A design ,#&lNQ'I  
example for a single group shows that data dependent ,v:m  
amplitude and phase errors can be eliminated. The tag AwB ]0H  
reflectors use a unique floating-electrode reflector } ab@Nd$  
structure in a single acoustic channel. Diffraction S pDVD  
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