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

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Linear-circular Polarizers and Circular-to-rectangular Waveguide Adapters

Features:

  • Low VSWR
  • Lightweight
  • Low cost

Applications:

  • Antenna measurements
  • Feeds for prime focus and
    Cassegrain antennas
  • Array elements

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Download the SGH specsheet (.pdf)

Description

Millitech series SGH standard gain conical and pyramidal horn antennas are electroformed to give precise dimensions and reproducible electrical characteristics. These feedhorns measure gain for other antennas by comparing the signal level of a test antenna to the standard gain horn, then adding this difference to the calibrated gain of the standard gain horn at the test frequency. They can also be used as reference sources in dual-channel antenna test receivers, or as receiver horns for radiation monitoring.

Conical standard gain horns are best suited for applications requiring a small, inexpensive antenna capable of polarization diversity.

The conical standard gain horns can support horizontal, vertical, left- and right-hand circular polarization when used with a polarizer. Typical beamwidth is 16º and typical midband gain is 21 dBi. Pyramidal horns have a typical beamwidth of 25° and a typical midband gain of 24 dBi.

In addition to the standard models listed, custom feedhorns are available upon request. For antennas with lower sidelobes and symmetrical radiation patterns, see series SFH. Also see series CHA for custom conical feedhorns with beamwidths other than those provided by series SGH.

Electrical Specifications *

Pyramidal Horns
Model Number SGH-42 SGH-28SGH-22 SGH-19 SGH-15SGH-12 SGH-10 SGH-08SGH-06 SGH-05 SGH-04SGH-03
Frequency band
and range (GHz)
K
18-26.5
Ka
26.5-40
Q
33-50
U
40-60
V
50-75
E
60-90
W
75-110
F
90-140
D
110-170
G
140-220
-
170-260
-
220-325
Gain (dB)24 2424 2424 2424 2424 2424 24
VSWR1.2:1 1.2:11.2:1 1.2:11.2:1 1.2:11.2:1 1.25:11.25:1 1.25:11.25:1 1.25:1
Conical Horns
Gain (dB)21 2121 2121 2121 2121 2121 21
VSWR1.2:1 1.2:11.2:1 1.2:11.2:1 1.2:11.2:1 1.25:11.25:1 1.25:11.25:1 1.25:1

* All values listed are typical performance

Typical Performance

SHG Typical Performance

Outline Drawings*

 SGH Outline Drawing

*The outlines shown may not reflect the latest information. Please contact Millitech for current outline drawings.

Mechanical Specifications

Circular Waveguide Output - Conical Horns
Diameter
(in)
Frequency
Range
A
(in/mm)
B
(in/mm)
Flange
MIL.F-3922
0.45517.5-20.5 2.300/58.4205.000/127.000 /54-001*
0.39620.0-24.5 2.660-67.5644.976/126.390 /54-001*
0.32824.0-26.5 2.350/59.6904.384/111.354 /54-001*
0.315 26.5-33.0 1.800/45.720 3.300/83.820 /54-003*
0.250 33.0-38.5 1.660/42.164 3.097/78.664 /54-003*
0.219 38.5-40.0 1.512/38.405 2.821/71.653 /54-003*
0.250 33.0-38.5 1.440/36.576 2.700/68.580 /67B-006
0.219 38.5-43.0 1.456/39.982 2717/69.012 /67B-006
0.188 43.0-50.0 1.276/32.410 2.381/60.477 /67B-006
0.210 40.0-43.0 1.180/29.972 2.250/57.150 /67B-007
0.188 43.0-50.0 1.276/32.410 2.381/60.477 /67B-007
0.165 50.0-60.0 1.079/27.407 2.013/51.130 /67B-007
0.165 50.0-58.0 0.950/24.130 1.900/48.260 /67B-008
0.141 58.0-68.0 0.942/23.927 1.757/44.628 /67B-008
0.125 68.0-75.0 0.830/21.082 1.548/39.319 /67B-008
0.136 60.0-66.0 0.784/19.914 1.600/40.640 /67B-009
0.125 66.0-88.0 0.770/19.558 1.438/36.525 /67B-009
0.094 88.0-90.0 0.667/16.942 1.244/31.598 /67B-009
0.112 75.0-88.0 0.644/16.358 1.300/33.020 /67B-010
0.094 88.0-110.0 0.599/15.215 1.118/28.397 /67B-010
0.089 90.0-115.0 0.514/13.056 1.100/27.940 /67B-M08
0.075 115.0-140.0 0.465/11.811 0.868/22.047 /67B-M08
0.073 110.0-140.0 0.418/10.617 0.900/22.860 /67B-M06
0.059 140.0-160.0 0.396/10.058 0.738/18.745 /67B-M06
0.058 140.0-220.0 0.328/8.331 0.750/19.050 /67B-M05
0.049 170.0-260.0 0.276/7.010 0.650/16.510 /67B-M04
0.039 220.0-325.0 0.218/5.537 0.550/13.970 ---
Rectangular Waveguide Output – Pyramidal Horns
ModelNumber A (in/mm) B (in/mm) C (in/mm) Flange MIL.F-3922
SGH-42 4.068/103.327 3.093/78.562 7.480/189.992 /54-001*
SGH-28 2.712/68.885 2.062/52.375 5.087/129.210 /54-003*
SGH-22 2.170/55.118 1.650/41.910 4.070/103.378 /67B-006
SGH-19 1.821/46.253 1.385/35.179 3.480/88.392 /67B-007
SGH-15 1.434/36.424 1.090/27.686 2.775/70.485 /67B-008
SGH-12 1.182/30.023 0.898/22.809 2.348/59.639 /67B-009
SGH-10 0.969/24.613 0.736/18.694 1.938/49.225 /67B-010
SGH-08 0.775/19.685 0.589/14.961 1.561/39.649 /67B-M08
SGH-06 0.630/16.002 0.479/12.167 1.265/32..131 /67B-M06
SGH-05 0.494/12.548 0.376/9.550 1.036/26.314 /67B-M05
SGH-04 0.417/10.592 0.317/8.052 0.855/21.717 /67B-M04
SGH-03 0.329/8.357 0.250/6.350 0.707/17.958 ---

* With #4-40 threaded holes.

How To Order

Specify Model Number
SGH-XX-ABCCC
XX = Waveguide Band
  • WR – number
A = Flange Type
  • R – round (not available in WR-42)
  • S – square (WR-42 and WR-28 only)
  • A – Precision Flange per Millitech IS000131, flat option (WR-08 through WR-05 only)
B = Horn Type
  • P – pyramidal (rectangular waveguide only)
  • C – conical
CCC = Circular Waveguide Diameter (in)
  • See Waveguide Sizes Table(below) (conical horn only)
  • Specify ØØØ for rectangular waveguide output (pyramidal horn only)

EXAMPLE:

To Order: Series SGH pyramidal standard gain horn with rectangular waveguide output in WR-10 waveguide band with a round flange.

Specify: SGH-10-RPØØØ

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.