Materials Measurement Phil Bartley Shelley Begley

GRL Cal – How it worksTime Domain of Empty Free Space FixturegateTransmittingAntennaReceivingAntennaAirAbove is a time domain S11 graph of the measured fixture when the fixtureis emptyNote that you can identify the various responses as the reflection associatedto the transmitting antenna, followed by the low reflection of air and thenthe reflection associated with the receiving antenna and its associatedsupporting structure. The GRL places time domain gates around theresponses associated with the transmitting antenna. The frequencydomain of this gated measurement is O11 of the port one error adapter.The same approach can be used to determine T11 of the port 2 erroradapter.. These terms can be then embedded into the original 2-portcalibration.Using this new calibration set the other terms of the error adapters can becalculated from the s-parameter measurements of the Thru (emptyfixture or air) and the Reflect (metal plate) standards.67