MIL-HDBK-660B
TABLE I. Waveguide bend values - Continued.
Waveguides |
Bending radius |
Dimension |
.750 x 1.5 inches M85/1-067-XXX (RG 50/U) M85/1-065-XXX (RG-106/U) |
Minimum bending radius, "E" No "H" bends, use manufactured elbows Minimum length for 90-degree twist Maximum inside wall variance |
12 inches 15 inches ยฑ .031 inch |
.625 x 1.125 inches |
Minimum bending radius, "E" Minimum bending radius, "H" Minimum length for 90-degree twist Maximum inside wall variance |
6 inches 12 inches 18 inches ยฑ .031 inch |
1.5 x .5 inches RG 110/U |
Minimum bending radius "E" or "H" Minimum length for 90-degree twist Maximum inside wall variance |
6 inches 15 inches ยฑ .031 inch |
1.2.4 Marking. Unless conditions make it absolutely necessary, never make a bend or twist sharper than the specified minimum. Under no conditions should the radius of a bend or twist be less than one full wavelength of the center frequency for any waveguide. The reflections caused by poorly matched bends can result in a high standing
wave ratio.
๐๐๐ฃ๐๐๐๐๐๐กโ ๐๐ ๐๐ =
30,000
๐ ๐๐ ๐๐ป๐ง
๐๐๐ฃ๐๐๐๐๐๐กโ ๐๐ ๐๐๐โ๐๐ =
11,808
๐ ๐๐ ๐๐ป๐ง
EXAMPLE A: The radii of preformed bends for M85/1-043-XXX (RG 48/U) is 7.5 inches (191 mm), whereas, the radii of bends formed for M85/1-043-XXX (RG 48/U) TE10 mode wavelength range (lowest to highest recommended operating frequency) is from 4.539 to 2.987 inches (115.29 to 75.87 mm). The mean wavelength is 3.763 inches (96 mm) and a waveguide half wavelength is 1.8815 inches (47.790 mm). Any multiple of 1.8815 inches (47.790 mm) that generates a radius greater than 7.5 inches (191 mm) should be used as the mean electrical length of a formed
bend for M85/1-043-XXX (RG 48/U) waveguide.
3
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