Power reflection coefficient analysis for complex impedances in RFID tag design

By Pavel V. Nikitin, K. Rao, S. Lam, V. Pillai, R. Martinez, H. Heinrich. IEEE transactions on microwave theory and techniques, 2005

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Sensitivity and Impedance Measurements of UHF RFID Chips (2009, neutral): “3.”
Radio Link Budgets for UHF RFID on Multipath Environments (2009, methodology): “The power received in the tag, , is given by a modification of Friis transmission equation [5]”
Conductive Inkjet-Printed Antennas on Flexible Low-Cost Paper-Based Substrates for RFID and WSN Applications (2009, methodology): “The return loss of this antenna was calculated based on the power reflection coefficient which takes into account the capacitance of the IC [23]:”
Chip Impedance Matching for UHF RFID Tag Antenna Design (2008, methodology): “The graphical approach of calculating the reflection coefficient for RFID complex matching using Smith chart is recently determined by Nikitin [7] with reference to Kurokawas original paper [8].”
Enabling Practical Backscatter Communication for On-body Sensors (2016, methodology): “FS-Backscatter tag is also inspired by previous work on RFID tag ASIC designs [38, 44, 50].”
Dual-Band Impedance-Matching Networks Based on Split-Ring Resonators for Applications in RF Identification (RFID) (2010, methodology): “These results were then exported to the Agilent ADS, from which it was possible to infer the power wave reflection coefficient, , [21], [22] by considering the impedance of the integrated circuit as reference impedance of the input port.”