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Offset Short Circuits
Description Offset shorts with 1/8 and 3/8 wavelength offsets are considered one of the more accurate means of obtaining a 180 degrees phase difference in waveguide. Use of these one-piece devices reduces the number of flange interfaces during the calibration and maintains the magnitude of the current flow across the calibration plane essentially constant. The chart below lists the available offset shorts. Those in rectangular guide are nominally 1/8 and 3/8 wavelength offset at a frequency near the waveguide band center. These will not be the exact band center as the frequency is chosen to equalize the phase differences at the band edges.
Available Models Band EIA Waveguide Size Frequency Range (GHz) Model Offset (cm) Delay (ps)1 Model Offset (cm) Delay (ps)1 L WR650 1.12 - 1.70 L340A1 3.581 119.488 L340A3 10.744 358.497 R WR430 1.70 - 2.60 R340F1 2.336 77.946 R340F3 7.010 233.904 S WR284 2.60 - 3.95 S340B1 1.524 50.852 S340B2 4.572 152.555 E WR229 3.30 - 4.90 E340B3 1.359 45.346 E340B4 4.077 136.038 G WR187 3.95 - 5.85 G340B1 1.212 40.441 G340B3 3.078 102.704 F WR159 4.90 - 7.05 F340C1 0.815 27.194 F340C3 2.446 81.616 C WR137 5.85 - 8.20 C340F1 0.686 22.890 C340F3 2.058 68.670 H WR112 7.05 - 10.00 H340B1 0.571 19.067 H340B3 1.714 57.191 HS WR102 7.00 - 11.00 HS340A 0.558 16.684 HS340B 1.676 55.923 X WR90 8.20 - 12.40 X340B1 0.483 16.116 X340B3 1.448 48.316 M WR75 10.00 - 15.00 M340C1 0.396 13.213 M340C3 1.189 39.674 P WR62 12.40 - 18.00 P340A1 0.352 11.745 P340A2 1.055 35.202 N WR51 15.00 - 22.00 N340A 0.267 8.909 N340B 0.800 26.694 K WR42 18.00 - 26.50 K340A1 0.251 8.365 K340A2 0.752 25.095 U WR28 26.50 - 40.00 U340B 0.150 5.005 U340C 0.450 15.015 J WR22 33.00 - 50.00 J340A1 0.120 4.007 J340B1 0.360 12.022 V WR15 50.00 - 75.00 V340A1 0.080 2.669 V340A3 0.240 8.008 Z WR10 75.00 - 110.00 Z340A1 0.054 1.802 Z340A3 0.162 5.405 1Offset delay is calculated without consideration for the dispersive effect of waveguide, assuming the short is in air dielectric coaxial line. This follows the convention established for Agilent network analyzers. Anritsu analyzers use the actual mechanical offset in centimeters.
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