Optimization of traceable coaxial RF reflection standards with 7-mm-N-connector using genetic algorithms

[摘要] A new coaxial device with 7-mm-N-connectorwas developed providing calculable complex reflection coefficientsfor traceable calibration of vector network analyzers(VNA). It was specifically designed to fill the gap between0 Hz (DC, direct current) and 250MHz, though the devicewas tested up to 10GHz. The frequency dependent reflectioncoefficient of this device can be described by a model, whichis characterized by traceable measurements. It is thereforeregarded as a “traceable model". The new idea of using suchmodels for traceability has been verified, found to be validand was used for these investigations. The DC resistancevalue was extracted from RF measurements up to 10 GHzby means of Genetic Algorithms (GA). The GA was usedto obtain the elements of the model describing the reflectioncoefficient Γ of a network of SMD resistors. The DC valuesdetermined with the GA from RF measurements match thetraceable value at DC within 3·10^-3, which is in good agreementwith measurements using reference air lines at GHz frequencies.

[学科分类] 电子、光学、磁材料