[射频]DESIGN OF GLOBAL SAW RFID TAG DEVICES

Reprint from Proceedings of the Second International Symposium on Acoustic Wave Devices B;xZ%M]  
For Future Mobile Communication Systems, Chiba University, Japan, March 2004 W<\kf4Y  
Page1 of 5 zyaW3th  
DESIGN OF GLOBAL SAW RFID TAG DEVICES " Sc5qG  
C. S. Hartmann, P. Brown, and J. Bellamy &
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RF SAW, Inc., 900 Alpha Drive Ste 400, Richardson, TX, U.S.A., 75081 t[]['Iosd  
Abstract - The Global SAW Tag [1] is projected to be =dgo!k  
a large-volume SAW device application. The c@RT$Q9j  
modulation method and overall tag data structure are u iBl#J Q  
reviewed for a family of proposed RFID devices. QuSV&>T\  
Current implementations use a basic group structure zW%>"y  
that encodes 16 information bits using 4 reflectors >
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chosen from 75 reflector slots. Several groups are X|X4L(i  
placed in-line on a single acoustic track to achieve ID \@Ee9C13  
tag devices with capacities up to 256 bits. RFID X}zX`]:I'  
system requirements for anti-collision, low tag loss J"%8:pL  
and high tag accuracy are presented. A design B3y?.  
example for a single group shows that data dependent N7e`6
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amplitude and phase errors can be eliminated. The tag 69t7=r  
reflectors use a unique floating-electrode reflector zWy ,Om8P  
structure in a single acoustic channel. Diffraction u|(Ux~O  
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