What are the corresponding circular waveguide diameters for each frequency band?

A circular waveguide refers to a waveguide with a circular cross-section. The lowest order propagation mode in a circular waveguide is TE11, which provides minimal signal degradation. The possible TM modes in circular waveguides are TM01, TM02, TM11, and TM12. The modes maintained by circular waveguides have many similarities with those of rectangular waveguides. For example, they can be classified as transverse electric modes (TE modes) without electric field components along the guiding axis, or as transverse magnetic modes (TM modes) without magnetic field components along the guiding axis.  

Frequency Band	Frequency Range		Circular WaveguideDiameter, Inches (mm)	Cover Flange (Brass)MIL-F- 3922 UG	Flange Type
X	LOW	8.2-9.97	1.094 (27.79)	53-001 UG-39/U	Square
	MID	8.5-11.6	0.938 (23.83)
	HIGH	9.97-12.4	0.797 (20.24)
Ku	LOW	12.4-15.9	0.688 (17.48)	53-005 UG-1666/U	Square
	MID	13.4-18.0	0.594 (15.08)
	HIGH	15.9-18.0	0.500 (12.70)
K	LOW	17.5-20.5	0.455 (11.56)	54-001 UG-595/U	Square
	MID	20-24.5	0.396 (10.06)
	HIGH	24-26.5	0.328 (8.33)
Ka	LOW	26.5-33	0.315 (8.00)	54-003 UG-595/U	Square
	MID	33-38.5	0.250 (6.35)
	HIGH	38.5-40	0.219 (5.56)
Q	LOW	33-38.5	0.250 (6.35)	67B-006 UG-383/U	Round
	MID	38.5-43	0.219 (5.56)
	HIGH	43-50	0.188 (4.78)
U	LOW	40-43	0.210 (5.33)	67B-007 UG-383/U-M	Round
	MID	43-50	0.188 (4.78)
	HIGH	50-60	0.165 (4.19)
V	LOW	50-58	0.165 (4.19)	67B-008 UG-385/U	Round
	MID	58-68	0.141 (3.58)
	HIGH	68-75	0.125 (3.18)
E	LOW	60-66	0.136 (3.45)	67B-009 UG-387/U	Round
	MID	66-82	0.125 (3.18)
	HIGH	82-90	0.094 (2.39)
W	LOW	75-88	0.112 (2.84)	67B-010 UG-387/U-M	Round
	HIGH	88-110	0.094 (2.39)
F	LOW	90-115	0.089 (2.26)	-UG-387/U-M	Round
	HIGH	115-140	0.075 (1.91)
D	LOW	110-140	0.073 (1.85)	-UG-387/U-M	Round
	HIGH	140-160	0.059 (1.50)
G	LOW	140-180	0.058 (1.47)	-UG-387/U-M	Round
	HIGH	180-220	0.045 (1.14)
—	—	170-260	0.049 (1.25)	-UG-387/U-M	Round
—	—	220-325	0.039 (0.99)	-UG-387/U-M	Round

  Note: The circular waveguide diameters provided correspond to each frequency band.