jcpascua
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Waveguide bends standard
Hi. I've been reading the documents here: **broken link removed**
(file is also attached) regarding waveguide bends and twists.
I need some help interpreting it. In page 2 to 3 of "MIL-HDBK-660", there is Table 1. How do I interpret the first column? I could easily understand what RG 109/U, RG 50/U, etc are; but I don't get the other contents of the first column (e.g. 23 to 6-1/2 inches, 6-1/2 x 3-1/4 inches, 3 x 1-1/2, etc). I'm not even sure if "6-1/2" stands for "6 to 1/2" or "six and a half". (It seems to be the latter though). How would I translate these numbers to the standard waveguide sizes?
Further, there is this paragraph:
"EXAMPLE A: The radii of preformed bends for RG 48/u is 7.5 inches, whereas ,
the radii of bends formed for RG 48/U TE1O mode wavelength range (lowest to
highest recommended operating frequency) is from 4.539 to 2.987 inches. The
mean wavelength is 3.763 inches and a waveguide half wavelength is 1.8825 inches.
Any multiple-of 1.8825 inches that generates a radius greater than 7.5 inches
shall be used as the mean electrical length of a formed bend for RG 48/u vave-
guide.."
Where'd it get the "7.5 in"? 7.5 seems to be the supposed minimum bend radius, but I didn't see any 7.5 in the last column of Table 1. How would I determine what value I would use in lieu of 7.5 if I use a different waveguide dimension? (Note that the value 7.5 is actually used in the subsequent calculations).
I would also appreciate other references for bending waveguides. I hope somebody can help me. Thanks in advance.
Hi. I've been reading the documents here: **broken link removed**
(file is also attached) regarding waveguide bends and twists.
I need some help interpreting it. In page 2 to 3 of "MIL-HDBK-660", there is Table 1. How do I interpret the first column? I could easily understand what RG 109/U, RG 50/U, etc are; but I don't get the other contents of the first column (e.g. 23 to 6-1/2 inches, 6-1/2 x 3-1/4 inches, 3 x 1-1/2, etc). I'm not even sure if "6-1/2" stands for "6 to 1/2" or "six and a half". (It seems to be the latter though). How would I translate these numbers to the standard waveguide sizes?
Further, there is this paragraph:
"EXAMPLE A: The radii of preformed bends for RG 48/u is 7.5 inches, whereas ,
the radii of bends formed for RG 48/U TE1O mode wavelength range (lowest to
highest recommended operating frequency) is from 4.539 to 2.987 inches. The
mean wavelength is 3.763 inches and a waveguide half wavelength is 1.8825 inches.
Any multiple-of 1.8825 inches that generates a radius greater than 7.5 inches
shall be used as the mean electrical length of a formed bend for RG 48/u vave-
guide.."
Where'd it get the "7.5 in"? 7.5 seems to be the supposed minimum bend radius, but I didn't see any 7.5 in the last column of Table 1. How would I determine what value I would use in lieu of 7.5 if I use a different waveguide dimension? (Note that the value 7.5 is actually used in the subsequent calculations).
I would also appreciate other references for bending waveguides. I hope somebody can help me. Thanks in advance.