[射频]DESIGN OF GLOBAL SAW RFID TAG DEVICES

Reprint from Proceedings of the Second International Symposium on Acoustic Wave Devices c^puz2  
For Future Mobile Communication Systems, Chiba University, Japan, March 2004 G$QN_h,}  
Page1 of 5 BgDWl{pm  
DESIGN OF GLOBAL SAW RFID TAG DEVICES ;mG
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C. S. Hartmann, P. Brown, and J. Bellamy T{-gbo`Yji  
RF SAW, Inc., 900 Alpha Drive Ste 400, Richardson, TX, U.S.A., 75081 yx*<c#Uf  
Abstract - The Global SAW Tag [1] is projected to be c9c3o{(6Y  
a large-volume SAW device application. The PyK!Cyq  
modulation method and overall tag data structure are XJy.xI>;  
reviewed for a family of proposed RFID devices. {X_
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Current implementations use a basic group structure nG{o$v_|  
that encodes 16 information bits using 4 reflectors fgC@(dvfk  
chosen from 75 reflector slots. Several groups are @0C[o9  
placed in-line on a single acoustic track to achieve ID gSj0+|  
tag devices with capacities up to 256 bits. RFID \1n (Jr.<  
system requirements for anti-collision, low tag loss sX*L[3!vN  
and high tag accuracy are presented. A design bu $u@:q 6  
example for a single group shows that data dependent WU@_aw[  
amplitude and phase errors can be eliminated. The tag  ylS
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reflectors use a unique floating-electrode reflector 2m*/$GZ  
structure in a single acoustic channel. Diffraction DO+~    
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