[射频]A Global SAW ID Tag with Large Data Capacity

Reprint from Proceedings of 2002 IEEE Ultrasonics Symposium
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Munich, Germany, October, 2002 B6;>V`!  
Page 1 of 5 j24DL+  
A Global SAW ID Tag with Large Data Capacity k H<C9z2=  
Clinton S. Hartmann* po'b((q  
RF SAW, Inc., 900 Alpha Drive, Richardson, Texas, U.S.A., 75081 ?%su?L  
Abstract - The Global SAW Tag uses a recentlyinvented '_V9FWDZ  
digital modulation based on simultaneous UCjx   
time position and phase shifting. A unique feature of +c!HXX  
this tag is that it satisfies global RFID requirements jUKMDlH  
using the international 2.44 GHz ISM band. %o4v} mzV  
Precision amplitude and phase weighting of reflectors >q&5Z  
and accurate control of parasitic effects is critical to F!g1.49""  
implementing this device. This tag has significantly rNJU & .]  
more data bits, lower insertion loss, and smaller die j1qU 4#Y  
area (i.e. lower cost) than previous SAW tags. These &
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improvements eliminate the shortcomings that have h~]e~u V  
previously limited the market for SAW RFID (radio jIr\.i  
frequency identification). A 2.44 GHz fundament .. szhSI  
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