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|Author(s):||Daniel G. Kuester; David R. Novotny; Jeffrey R. Guerrieri; Randy Direen; Zoya Popovic;|
|Title:||Reference Modulation for Calibrated Measurements of Tag Backscatter|
|Published:||April 14, 2011|
|Abstract:||We present a model and reference backscatter device for calibrating measurements of 860-960 MHz Ultra-High Fre- quency (UHF) tag backscattering. The model relates transmission to and backscattering from the device with a modulation depth calculable from circuit parameters. Unlike the free-space far field approximations, the model is valid in arbitrary stationary linear environments, including the near field of a transmit or measurement antenna, via S-parameters. We use the model to demonstrate an inexpensive reference backscatter device with a common lab switch and loads. Validation measurements on a network analyzer with two expressions for modulation depth agree to within 0.1 dB at 915 MHz. Finally, we present some initial calibrated measurements of backscattered power from a tag at 915 MHz, with estimated uncertainty -0.7 dB to +0.6 dB.|
|Proceedings:||2011 IEEE International Conference on RFID|
|Dates:||April 12-14, 2011|
|Keywords:||RFID, UHF, backscatter, modulation|