ORTHO-MODE TRANSDUCERS (OMTs)

Seavey Engineering specializes in ortho-mode transducers (OMTs) and produces a wide range of products, including unique dual-band components. OMTs couple two isolated signals from rectangular waveguide ports into a single square or round waveguide. High isolation, good impedance match, low cross-polarization and high power handling capability are provided over communications bandwidths.

Standard products also include dual-band and three-port designs, co-polarized models and orthogonal circularly polarized models which integrate an OMT junction and an efficient, low axial ratio polarizer.  

OMTs may be utilized in antenna feeds for systems with frequency reuse capability, such as satellite communications and troposcatter links.

pg114a
pg114b
Model OMT-2030
pg114cpg114d
Model OMT-11H

SPECIFICATION
Mode
Number		 Frequency, GHz
Port 1		 Frequency, GHz
Port 2		 VSWR
Max.		 Isolation
dB		 Common Port
Inches		 Flanges Style
OMT-11
0.80 - 0.95
0.80 - 0.95
1.3
35
8.30 Sq.
WR-975
A
OMT-11H
0.87 - 1.03
0.87 - 1.03
1.2
35
7.90 Sq.
WR-975
A
OMT-11A
1.12 - 1.35
1.70 - 2.40
1.3
35
6.00 Sq.
WR-650
A
OMT-22
1.70 - 2.40
2.10 - 2.40
1.3
35
3.66 Sq.
WR-430
A
OMT-33
2.70 - 2.90
2.70 - 2.90
1.3
35
2.63 Sq.
WR-284
B
OMT-44
3.70 - 4.20
3.70 - 4.20
1.3
35
2.24 Sq.
WR-229
B
OMT-44B
3.70 - 4.20
3.70 - 4.20
1.3
35
2.24 Sq.
WR-229
C
OMT-44C
3.70 - 4.20
3.70 - 4.20
1.4
17
2.13 Dia.
WR-229
D
OMT-46CO
3.70 - 4.20
5.925 - 6.425
1.4
30
2.13 Dia.
WR-229 & WR-137
B
OMT-46B
3.70 - 4.20
5.925 - 6.425
1.3
35
2.13 Dia.
WR-229 & WR-137
C
OMT-446
3.70 - 4.2 x 2
5.925 - 6.425
2.0
17
2.13 Dia.
WR-229 & WR-137
E
OMT-44S
3.50 - 5.10
3.50 - 5.10
1.3
35
2.00 Sq.
WR-187
A
OMT-55
4.40 - 5.00
4.40 - 5.00
1.3
35
1.60 Sq.
WR-187
A
OMT-66
5.90 - 7.70
5.90 - 7.70
1.7
35
1.375 Dia.
WR-137
B
OMT-67
5.90 - 7.80
7.10 - 8.40
1.7
35
1.375 Dia.
WR-137
B
OMT-611
5.90 - 7.70
10.7 - 13.25
1.7
35
1.75 Dia.
WR-137 & WR-75
B
OMT-77H
6.90 - 7.10
7.70 - 8.50
1.5
35
1.2 Dia.
WR-137
B
OMT-77
7.20 - 8.40
7.20 - 8.40
1.7
35
1.00 Dia.
WR-112
B
OMT-77C
7.20 - 8.40
7.20 - 8.40
1.7
17
1.00 Dia.
WR-112
D
OMT-78C
7.25 - 7.75
7.90 - 8.40
1.3
35
1.062 Dia
WR-112
D
OMT-8812
8.00 - 12.0
8.00 - 12.0
2.0
20
0.870 Sq.
WR-90
B
OMT-88
8.20 - 9.60
8.20 - 9.60
1.7
35
0.90 Sq.
WR-90
B
OMT-99
9.60 - 10.5
9.60 - 10.5
1.7
35
0.90 Sq.
WR-90
B
OMT-1212/1
10.70 - 11.7
10.70 - 11.7
1.4
35
0.750 Dia.
WR-75
B
OMT-1212/2
11.70 - 12.2
11.70 - 12.2
1.3
35
0.750 Dia.
WR-75
B
OMT-1212CO
11.70 - 12.2
14.00 - 14.5
1.5/2.0
15/50
0.750 Dia.
WR-75
B
OMT-1214/1
10.95 - 12.75
14.00 - 14.5
1.4
35
0.750 Dia.
WR-75
B
OMT-1214F
10.95 - 12.75
14.00 - 14.5
1.3
60
0.750 Dia.
WR-75
B
OMT-1214/2
11.70 - 12.2
14.00 - 14.5
1.4
35
0.750 Dia.
WR-75
B
OMT-1218
12.00 - 18.0
12.00 - 18.0
2.0
20
0.590 Sq.
WR-62
B
OMT-1214/3
12.20 - 12.7
14.00 - 14.5
1.4
35
0.750 Dia.
WR-75
B
OMT-1414
14.00 - 15.2
14.00 - 15.2
1.4
35
0.577 Sq.
WR-62
B
OMT-1818
17.70 - 19.7
17.70 - 19.7
1.4
25
0.420 Sq.
WR-42
F
OMT-2030
19.20 - 20.2
29.00 - 30.0
2.0
30
3.62 Sq.
WR-42 & WR-28
B
OMT-2121
21.20 - 23.6
21.20 - 23.6
1.4
25
0.420 Sq.
WR-42
F
OMT-2828
27.50 - 29.5
27.50 - 29.5
1.4
25
0.420 Sq.
WR-28
F
OMT-2727
27.50 - 32.5
27.50 - 32.5
1.6
35
0.280 Dia.
WR-28
B
OMT-3939
39.00 - 40.0
39.00 - 40.0
1.4
25
0.195 Sq.
WR-28
F
NOTES:
  • C suffix indicates circular polarization.
  • CO suffix indicates co-polarization.
  • H suffix indicates a high power design. Product examples are listed for 300 KW average power per port in WR-975, 250 KW peak with 2.2 KW average in WR-137 waveguides.
  • F suffix indicates design with integral high- and low-pass waveguide filters with 60 dB rejection.
 OPTIONS:
  • Different waveguide flanges
  • Frequency tuning options