Abstract
A new calibration method for a six-port reflectometer which minimizes the effect of power measurement errors is presented. It is based on the power divider correlator to obtain estimates of the six-port calibration constants. The calibration procedure is to determine the constants that govern the operation of the six-port from the measurement of power or output ports tensions by placing five to eleven standard loads in succession to DUT. A load and four offset shorts are used as reflection standards. Computer simulation results are presented to show that the described procedure substantially reduces the overall error in the calibration constants.
Highlights
Considerable improvement has been made in microwave components and new devices have become available
The six-port reflectometer serves as standard measurement system to determine the complex reflection coefficient of the commercial working standards (Abou Chahine et al, 2000)
Some circuits present a new type of four-port automatic network analyzer containing one power detector and one variable reference load (Brantervik and Kollberg, 1985)
Summary
Considerable improvement has been made in microwave components and new devices have become available. Most circuits pointed out that there exist exact relations between some system parameters and integral quantities of the detected power values for a number of reference plane positions (Yakabe, 1994) Such techniques require additional microwave hardware and auxiliary control circuits made for such calibration purposes. Another type uses Schottky diodes (Cronson and Fong-Tom, 1982) that can be Utilized with homodyne detection technique (Simon, 1991). It would be entirely impractical for a DMR to perform a calibration procedure. We place five to eleven standard loads according to the DUT that before we know their reflection coefficient (El-Deeb, 1991)
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