The analysis of reflectometer configurations based on six-port technique

This paper presents the analysis of reflectometer (SPR) performance employing three different six-port configurations constructed and simulated in Agilent Advanced Design Software (ADS). The complex reflection coefficients given by three configurations of six-port reflectometer are determined by mathematical expression of the six-port scattering parameters. To verify the accuracy of the simulated reflection coefficient value, all the six-port configurations are formed by interconnection between 3dB power dividers and 3dB couplers which are readily available in ADS software. The performance of reflectometer is also validated by connecting 50 ohm Match Load, Short and Open Termination as Device Under Test (DUT). The value of the simulated reflection coefficient for all configurations shows closer to the theoretical value however, further calibration algorithm can be applied in the future for better accuracy.