Antenna & RF/Microwave System
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A Grid-Shaped Microstrip Traveling Wave Antenna With Selective Differential Feeding Networks for CM-Level Position Detection Systems

 A near-field ultrahigh-frequency radio frequency identification (RFID) system, which has cm-level 2-D positioning precision, is proposed. The system consists of a grid-shaped microstrip traveling wave antenna (TWA) and four-port switched differential feeding networks. To selectively form tag-read sections, opposite directional currents (ODCs) are used. 


[System Specification]


Frequency band: 830~950MHz
Antenna size: 110×110×1.2 mm
Read range: centimeter-level position detection(15~20mm)
 
Article
https://ieeexplore.ieee.org/abstract/document/8359456