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AS9100 Rev C, ISO 9001:2008,
ISO 14001:2004 and OHSAS 18001:2007

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Orthomode Transducer

Features:

  • High isolation (greater than 25 dB)
  • Broadband operation
  • Low insertion loss

Applications:

  • Dual-polarized radar antennas
  • Radiometers
  • Diplexer for communication links

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Download the OMT specsheet (.pdf)

Description

Millitech series OMT orthomode transducers are used to combine or separate two orthogonal linearly-polarized signals simultaneously. Typical output (or input port) is a circular waveguide, which can support both linear polarizations or circular (left-hand and right-hand) polarization, and is generally connected to an antenna feedhorn.

Greater than 25 dB isolation between the two linear polarizations is achieved over a significant portion of the waveguide band.

The orthomode transducer has both output linear polarization ports in rectangular waveguide, as it incorporates a built-in transition from circular-to-rectangular waveguide.

Millitech also offers orthomode transducers that cover up to full band. See the list of standard models below.

Electrical Specifications

Model Number Frequency
Range (GHz)
1,4
Circular Waveguide
Diameter (in/mm)
Insertion Loss
(typical) (dB)
VSWR2
(typical)
Isolation3
(typical) (dB)
OMT-42-455BC 17.5-20.5 0.455/11.56 .3 1.2:1 >35
OMT-42-396BC 20.0-24.5 0.396/10.06 .3 1.2:1 >35
OMT-42-328BC 24.0-26.5 0.328/8.33 .3 1.2:1 >35
OMT-42-KKKBC 18.0-26.5 SQUARE .3 1.5:1 >35
OMT-28-315BC 26.5-33.0 0.315/8.00 .3 1.2:1 >35
OMT-28-250BC 33.0-38.5 0.250/6.35 .3 1.2:1 >35
OMT-28-219BC 38.5-40.0 0.219/5.56 .3 1.2:1 >35
OMT-28-AAABC 26.5-40.0 SQUARE .4 1.5:1 >35
OMT-22-250BC 33.0-38.5 0.250/6.35 .4 1.2:1 >35
OMT-22-219BC 38.5-43.0 0.219/5.56 .4 1.2:1 >35
OMT-22-188BC 43.0-50.0 0.188/4.78 .4 1.2:1 >35
OMT-22-QQQBC 33.0-50.0 SQUARE .4 1.5:1 >35
OMT-19-210BC 40.0-43.0 0.210/5.33 .5 1.2:1 >35
OMT-19-188BC 43.0-50.0 0.188/4.78 .5 1.2:1 >35
OMT-19-165BC 50.0-60.0 0.165/4.19 .5 1.2:1 >35
OMT-19-UUUBC 33.0-50.0 SQUARE .5 1.5:1 >35
OMT-15-165BC 50.0-58.0 0.165/4.19 .5 1.2:1 >35
OMT-15-141BC 58.0-68.0 0.141/3.58 .5 1.2:1 >35
OMT-15-125BC 68.0-75.0 0.125/3.18 .5 1.2:1 >35
OMT-15-VVVBC 50.0-75.0 SQUARE .6 1.5:1 >35
OMT-12-136BC 60.0-66.0 0.136/3.45 .6 1.2:1 >35
OMT-12-125BC 66.0-82.0 0.125/3.18 .6 1.2:1 >35
OMT-12-094BC 82.0-90.0 0.094/2.39 .6 1.2:1 >35
OMT-12-EEEBC 60.0-90.0 SQUARE .6 1.5:1 >35
OMT-10-112BC 75.0-88.0 0.112/2.84 .7 1.2:1 >35
OMT-10-094BC 88.0-110.0 0.094/2.39 .7 1.2:1 >35
OMT-10-WWWBC 75.0-110.0 SQUARE .7 1.5:1 >35
OMT-08-089BC 90.0-115.0 0.089/2.26 .9 1.2:1 >35
OMT-08-075VBC 115.0-140.0 0.075/1.91 .9 1.2:1 >35
OMT-08-FFFBC 90.0-140.0 SQUARE .9 1.5:1 >35
OMT-06-073BC 110.0-140.0 0.073/1.85 1 1.2:1 >35
OMT-06-059BC 140.0-160.0 0.059/1.50 1 1.2:1 >35
OMT-06-DDDBC 110.0-170.0 SQUARE 1 1.5:1 >35
OMT-05-058BC 140.0-180.0 0.058/1.47 1.2 1.2:1 >35
OMT-05-045BC 180.0-220.0 0.045/1.14 1.2 1.2:1 >35
OMT-05-GGGBC 140.0-220.0 SQUARE 1.2 1.5:1 >35
OMT-04-049BC 170.0-260.0 0.049/1.25 1.4 1.5:1 >35
OMT-03-039BC 220.0-325.0 0.039/0.99 1.8 1.5:1 >35

*1 - If the required frequencies fall within two waveguide diameter sizes, the larger one should be selected.
*2 – Typical value. Lower VSWR option may be available depending on requirements
*3 – Depending on requirements
*4 – Please contact Millitech to discuss bandwidth options

*FOR MECHANICAL SPECIFICATIONS CONTACT MILLITECH.

How To Order

Specify Model Number
OMT-XX-AAABC
XX = Waveguide Band
  • WR – number
AAA = Circular Waveguide Diameter (in inches)
  • See Waveguide Sizes Table (below)
B = Flange Type (rectangular waveguide)
  • A – round, precision anti-cocking (available > WR-15)
  • R – round (not available in WR-42)
  • S – square (WR-42 and WR-28 only)
C = Flange Type (circular waveguide)
  • A – round, precision anti-cocking (available > WR-15)
  • R – round (not available in WR-42)
  • S – square (WR-42 and WR-28 only)

*Please specify frequency range when ordering

Circular Waveguide Sizes

Rectangular
Waveguide Band
Circular Diameter Size Frequency
Range (GHz)*
Circular Waveguide
Diameter (in/mm)
Specify When
Ordering
K Large 17.5-20.5 0.455/11.56 455
Medium 20.0-24.5 0.396/10.06 396
Small 24.0-26.5 0.328/8.33 328
Ka Large 26.5-33.0 0.315/8.00 315
Medium 33.0-38.5 0.250/6.35 250
Small 38.5-40.0 0.219/5.56 219
Q Large 33.0-38.5 0.250/6.35 250
Medium 38.5-43.0 0.219/5.56 219
Small 43.0-50.0 0.188/4.78 188
U Large 40.0-43.0 0.210/5.33 210
Medium 43.0-50.0 0.188/4.78 188
Small 50.0-60.0 0.165/4.19 165
V Large 50.0-58.0 0.165/4.19 165
Medium 58.0-68.0 0.141/3.58 141
Small 68.0-75.0 0.125/3.18 125
E Large 60.0-66.0 0.136/3.45 136
Medium 66.0-82.0 0.125/3.18 125
Small 82.0-90.0 0.094/2.39 094
W Large 75.0-88.0 0.112/2.84 112
Small 88.0-110.0 0.094/2.39 094
F Large 90.0-115.0 0.089/2.26 089
Small 115.0-140.0 0.075/1.91 075
D Large 110.0-140.0 0.073/1.85 073
Small 140.0-160.0 0.059/1.50 059
G Large 140.0-180.0 0.058/1.47 058
Small 180.0-220.0 0.045/1.14 045
--- --- 170.0-260.0 0.049/1.25 049
--- --- 220.0-325.0 0.039/0.99 039

* If the required frequencies fall within two waveguide diameter sizes, the larger one should be selected.