Title :
An active tagging system using circular-polarization modulation
Author :
Kossel, Marcel A. ; Küng, Roland ; Benedickter, Hansruedi ; Biichtokd, W.
Author_Institution :
Lab. for Electromagnet. Fields & Microwave Electron., Swiss Fed. Inst. of Technol., Zurich, Switzerland
fDate :
12/1/1999 12:00:00 AM
Abstract :
An active read/write microwave tagging system using circular-polarization modulation as a novel modulation scheme for radio-frequency identification systems is presented. The proposed modulation scheme reduces demodulation complexity and power consumption on the battery-powered tag. Additional coding of the circular-polarization modulated data reduces transmission errors due to polarization inversion at multipath propagation. In multiple-reader environments, the main jamming threat occurs from power carriers of different interrogators. A combination of circular-polarization modulation and frequency hopping is presented that shows an increased immunity against multipath phenomena for multiple-tag and multiple-reader environments
Keywords :
demodulation; electromagnetic wave polarisation; frequency hop communication; identification technology; jamming; microwave measurement; multipath channels; active tagging system; circular-polarization modulated data; circular-polarization modulation; demodulation complexity; frequency hopping; jamming threat; microwave tagging; multipath phenomena; multipath propagation; multiple-reader environments; multiple-tag environments; polarization inversion; power carriers; power consumption; radio-frequency identification systems; transmission errors; Demodulation; Energy consumption; Frequency modulation; Jamming; Microwave propagation; Modulation coding; Polarization; Radio frequency; Radiofrequency identification; Tagging;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
