Equivalent circuit of x-shaped converter of complex reflection coefficient analyzer

Volodymyr Karlov

Abstract


The equivalent circuit of the measuring channel of the X-shaped converter of the complex reflection coefficient analyzer in the form of a four-probe section has been developed. The location of the probes corresponds to nodal cross sections of a standing wave in each output port of the E-planar X-shaped power divider. The main operation characteristics of the X-shaped converter are phase shifts between adjacent ports-probes.

The developed graphic interface for gauging the converter allows: modeling measured phase shifts for passive loads in the operational frequency range of a rectangular waveguide; setting the X-shaped power divider for the real phase shifts; using the X-shaped divider as an installed monoparameter reference standard for gauging external loads in future.

The experiment results have shown that the measured phase shifts between adjacent probes-ports differ from the estimated ones approximately by 1 degree.

The developed graphic interface by measuring 7500 samples of the complex load reflection coefficient with the vibration frequency of 10 Hz has helped to find out that the average value of the reflection coefficient modulus is equal to 0,54, and the points fit in the circle on the G-plane with the scattering less than 2%


Keywords


vector network analyzer; four-port discontinuity; reflection coefficient

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References


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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061