Waveguides

Microwave engineer or plumber? It can be difficult to distinguish. My first industrial experience in the microwave world was using a machine to H bend L band waveguide into S shapes.

Circular Waveguide. A different type of water pipe.

Frequency (GHz) Internal dia(mm) IEC R.. Cutoff TE11 (GHz) Cutoff TM01 (GHz) Cutoff TE21 (GHz)
0.285 - 0.339 647.90 C 3.3 0.271 0.354 0.450
0.333 - 0.397 553.49 C 4 0.317 0.415 0.527
0.390 - 0.464 472.85 C 4.5 0.372 0.485 0.616
0.457 - 0.544 403.94 C 5.3 0.435 0.568 0.722
0.535 - 0.636 345.06 C 6.2 0.509 0.665 0.845
0.626 - 0.745 294.79 C 7 0.596 0.778 0.989
0.733 - 0.872 251.84 C 8 0.698 0.911 1.157
0.858 - 1.021 215.14 C 10 0.817 1.067 1.355
1.004 - 1.195 183.77 C 12 0.956 1.249 1.586
1.175 - 1.399 157.00 C 14 1.119 1.462 1.856
1.376 - 1.638 134.11 C 16 1.310 1.711 2.173
1.610 - 1.917 114.58 C 18 1.533 2.003 2.544
1.885 - 2.244 97.866 C 22 1.795 2.345 2.978
2.206 - 2.627 83.617 C 25 2.101 2.744 3.486
2.583 - 3.075 71.425 C 30 2.460 3.213 4.081
3.023 - 3.598 61.036 C 35 2.879 3.760 4.775
3.548 - 4.224 51.994 C 40 3.379 4.414 5.606
4.150 - 4.941 44.450 C 48 3.953 5.163 6.557
4.842 - 5.764 38.100 C 56 4.612 6.023 7.650
5.670 - 6.750 32.537 C 65 5.400 7.053 8.958
6.639 - 7.904 27.788 C 76 6.323 8.258 10.49
7.743 - 9.218 23.825 C 89 7.375 9.632 12.23
9.113 - 10.85 20.244 C 104 8.679 11.34 14.40
10.56 - 13.13 17.475 C 120 10.05 13.13 16.68
12.23 - 14.56 15.088 C 140 11.65 15.21 19.32
14.53 - 17.29 12.700 C 165 13.84 18.07 22.95
16.58 - 19.74 11.125 C 190 15.79 20.63 26.20
19.37 - 23.06 9.5250 C 220 18.45 24.09 30.60
22.14 - 26.36 8.3312 C 255 21.09 27.55 34.98
25.85 - 30.77 7.1374 C 290 24.62 32.15 40.85
29.05 - 34.59 6.3500 C 330 27.67 36.14 45.90
33.17 - 39.48 5.5626 C 380 31.59 41.26 52.40
38.63 - 45.99 4.7752 C 430 36.79 48.06 61.04
42.23 - 50.27 4.3688 C 495 40.22 52.53 66.71
51.51 - 61.32 3.5814 C 580 49.06 64.08 81.38
58.11 - 69.17 3.1750 C 660 55.34 72.30 91.80
66.63 - 79.33 2.7686 C 765 63.46 82.89 105.3
77.27 - 91.99 2.3876 C 890 73.59 96.12 122.1

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