Calibration of a 220–325 GHz vector-network-analyzer with multiple rectangular-waveguide sections

We study the performance of the multiline through-reflect-line method in the calibration of a 220-325 GHz vector-network-analyzer with WR-03 rectangular-waveguide test-ports. The calibration method is based on multiple uniform-waveguide sections with unknown propagation constant and different lengths, a reflect standard which is assumed to be identical on both vector-network-analyzer ports but otherwise unknown, and a direct thru connection of the test ports. Experimental verification demonstrates that the multiline through-reflect-line technique yields repeatable and physically meaningful results.