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Millimeter Wave / THz Custom Solutions

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We have prepared a list of technical references that may be useful while you are visiting our website

 

Waveguide & Flange Designations

This reference is about rectangular electromagnetic waveguides at millimeter wave / THz frequencies. The table below presents commonly used rectangular waveguide and flange designations. Note that above 75 GHz new waveguide designations have been proposed by IEEE in order to extend standards to 1.1 THz.

Operating Frequency (GHz) Frequency Band Designation Waveguide Designation Flange UG  Flange Type Cut-off Frequency (GHz) Inner Dimensions (mm)
 EIA -1  RCSC -2 IEEE -3
18.00 - 26.50 K Band WR 42 WG 20   UG 599/U Square 14.051 10.668 x 5.334
22.00 - 33.00   WR 34 WG 21     Square 17.357 8.636 x 4.318
26.50 - 40.00 Ka Band WR 28 WG 22   UG 595/U Square 21.077 7.112 x 3.556
33.00 - 50.00 Q (B) Band WR 22 WG 23   UG 383/U Round 26.346 5.690 x 2.945
40.00 - 60.00 U Band WR 19 WG 24   UG 383/U-M Round 31.391 4.775 x 2.3875
50.00 - 75.00 V Band WR 15 WG 25   UG 385/U Round 38.875 3.760 x 1.880
60.00 - 90.00 E Band WR 12 WG 26   UG 387/U Round 48.373 3.098 x 1.550
 75.00 - 110.00 W Band WR 10 WG 27 WM-2540 UG 387/U-M Round 59.015 2.540 x 1.270
 90.00 - 140.00 F Band WR 08 WG 28 WM-2032 UG 387/U-M Round 73.768 2.032 x 1.016
 110.00 - 170.00 D Band WR 06 WG 29 WM-1651 UG 387/U-M Round 90.791 1.651 x 0.8255
 140.00 - 220.00 G Band  WR 05 WG 30 WM-1295 UG 387/U-M Round 115.714 1.295 x 0.6475
 170.00 - 260.00   WR 04 WG 31 WM-1092 UG 387/U-M Round 137.243 1.092 x 0.546
220.00 - 330.00   WR 03 WG 32 WM-864 UG 387/U-M Round 173.571 0.864 x 0.432
260.00 - 400.00   WR 2.8   WM-710 UG 387/U-M  Round  211.12  0.710 x 0.355 
330.00 - 500.00   WR 2.2   WM-570 UG 387/U-M  Round  262.97 0.570 x 0.285 
500.00 - 750.00   WR 1.5   WM-380 UG 387/U-M Round  394.46  0.380 x 0.190  

-1 EIA: Electronic Industries Alliance
-2 RCSC: Radio Components Standardization Committee
-3 IEEE: new standard
-4 Above about 100 GHz there are often incompatibilites between flanges produced by a variety of companies. This has arisen because the MIL STD flanges have insufficient precision to achieve good performance at shorter wavelengths. A series of ad hoc adjustments have been made by manufacturers in an effort to improve performance, however this can lead to interconnection issues. VivaTech recommends that the customer always specifies the required flange dimensions including the dowel holes and pin diameter when ordering components > 100 GHz.

 


 

dBm & mW Conversion

The power conversion of dBm to mW is given by the formula:        P(mW) = 10(P(dBm) / 10)            therefore, 1dBm = 1.258925mW

The power conversion of mW to dBm is given by the formula:        P(dBm) = 10 · log10( P(mW) / 1mW)            therefore, 1mW = 0dBm

The table below provides a quick look-up conversion result.

0.00100 mW 0.00200 mW 0.00398 mW 0.00794 mW 0.015865 mW 0.03162 mW 0.06310 mW 0.12589 mW 0.25119 mW 0.50119 mW  
- 30 dBm - 27 dBm - 24 dBm - 21 dBm - 18 dBm - 15 dBm - 12 dBm - 9 dBm - 6 dBm - 3 dBm 0.50119 mW 
--------->>>              --------->>>   0 dBm 1.00000 mW
                  1 dBm 1.25893 mW
                  2 dBm  1.58489 mW
                  3 dBm  1.99526 mW
                  4 dBm  2.51189 mW
                  5 dBm  3.16228 mW 
                  6 dBm  3.98107 mW 
                  7 dBm  5.01187 mW 
<<<--------             <<<--------   8 dBm  6.30957 mW 
40 dBm 30 dBm 25 dBm 20 dBm 18 dBm 16 dBm 14 dBm 12 dBm 10 dBm 9 dBm 7.94328 mW 
10,000.00000 mW 1,000.00000 mW 316.22777 mW 100.00000 mW 63.09573 mW 39.81072 mW 25.11886 mW 15.84893 mW 10.00000 mW 7.94328 mW  

 


 

 VSWR & Return Loss Look Up Table

VSWR Return Loss (dB) Transmission Loss (dB) Power Transmitted (%) Power Reflected (%) Voltage Reflection Coefficient
1.00 : 1 Infinity .000 100.0 .0 .00
1.02 : 1 40.1 .000 100.0 .0 .01
1.04 : 1 34.2 .002 100.0 .0 .02
1.06 : 1 30.7 .004 99.9 .1 .03
1.08 : 1 28.3 .006 99.9 .1 .04
1.10 : 1 26.4 .010 99.8 .2 .05
1.12 : 1 24.9 .014 99.7 .2 .06
1.14 : 1 23.7 .019 99.6 .4 .07
1.16 : 1 22.6 .024 99.5 .5 .07
1.18 : 1 21.7 .030 99.3 .7 .08
1.20 : 1 20.8 .036 99.2 .8 .09
1.25 : 1 19.1 .054 98.8 1.2 .11
1.30 : 1 17.7 .075 98.3 1.7 .13
1.40 : 1 15.6 .122 97.2 2.8 .17
1.50 : 1 14.0 .177 96.0 4.0 .20
1.60 : 1 12.7 .238 94.7 5.3 .23
1.70 : 1 11.7 .302 93.3 6.7 .26
1.80 : 1 10.9 .370 91.8 8.2 .29
1.90 : 1 10.2 .440 90.4 9.6 .31
2.00 : 1 9.5 .512 88.9 11.1 .33
3.00 : 1 6.0 1.240 75.0 25.0 .50
4.00 : 1 4.4 1.930 64.0 36.0 .60
5.00 : 1 3.5 2.550 55.6 44.4 .67
10.00 : 1 1.7 4.800 33.1 66.9 .82
Infinity : 1 0.0 Infinity 0.0 100.0 1.00