Frequency selective improvement of the directivity of a return loss bridge

摘要: A frequency selective improved directivity of a return loss bridge is achieved by generating counteractive reflected energy vector to cancel caused imperfections, such as parasitic effects and an unbalanced balun, in the bridge. The equal magnitude, but opposite phase, undesired may be induced into transmission path between test port coupled port. An open circuit stub used provide vector. Alternatively across coupling resistor from vector, with PIN diodes being for tunability if desired.