MIL-HDBK-660B
L = mean electrical length
c = height or width of outer dimension of waveguide depending on plane of bend.
b = larger dimension of waveguide
FIGURE 2. Electrical length of bend.
To determine the radius of a 90-degree bend, the following calculations are made.
From the above formula in Example A:
RL = 0.637L
R = 57.32 °• L S = 90°
L 90°
Referring to M85/1-043-XXX (RG 48/U), operating in the TE10 mode where RL is greater than 7.5
+ a inches, where R = 7.5 inches and L is a multiple of ' . ' = 3.763 inches, ' = 1.8815
2 2 2
inches, a = 1.34 inches, b = 2.84 inches, c = 1.5 inches for an "E" bend.
Then let L = 6 x ' = 11.289 inches, then RL = 0.637 x 11.289 = 7.2 inches and R = 6.44 inches.
2
Since the resultant value is less than 7.5 inches, the radius cannot be used. Based on similar computations, when: L = 7 x ' = 13.170, RL = 8.39, R = 7.64 inches
2
L = 8 x ' = 15.05, RL = 9.588, R = 8.838 inches and so forth; hence, the radii computed
2
for a value of L which is a multiple of ' of 7 or greater may be used.
2
For an "H" bend, c = 3.0 inches
when: L = 7 x ' = 13.170, RL = 8.39, R = 6.89 inches
2
L = 8 x ' = 15.05, RL = 9.588, R = 8.09 inches and so forth; hence a value of L which is
2
a multiple of ' of 8 or greater may be used.
2
4
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