The LRR method for the calibration of vector networkanalyzers is presented. This method belongs to the selfcalibration procedures where the calibration circuits might bepartly unknown. The LRR calibration circuits are all of equalmechanical length in contrast to the well known TRL calibration,which needs a line-standard with a different lengththan the other calibration standards. For the LRR method itis thus not necessary to displace the connectors of the vectornetwork analyzer during calibration in order to contact thecalibration structures. The calibration circuits mainly consistof reflective networks that have to be placed at three consecutivepositions. As the algorithm accounts for different distancesbetween the reflective networks, the circuits are easyto realize. The robust functionality of the LRR method isconfirmed by measurements.
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