S. Srikanth, A WIDE-BAND CORRUGATED RECTANGULAR WAVE-GUIDE PHASE-SHIFTER FOR CRYOGENICALLY COOLED RECEIVERS, IEEE microwave and guided wave letters, 7(6), 1997, pp. 150-152
A wide-band phase shifter rectangular in cross section with transverse
corrugations on all four walls is presented in this letter. The loadi
ng for the two orthogonal modes is different and is achieved by choosi
ng dissimilar corrugation parameters. This phase shifter measures a re
turn loss of -25 dB or better and differential phase shift of 90 degre
es +/- 3.3 degrees between 18.9-26.5 GHz. This all-metal robust phase
shifter is ideal for cryogenically cooled radio astronomy receivers.