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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 insertion loss and axial ratio
  • Broadband operation

Applications:

  • Antennas and quasioptics
  • Radar front ends

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Download the 18-40 GHz POL/WAC specsheet (.pdf)

Description

Millitech series POL linear-circular polarizers convert a linearly-polarized signal to a circularly-polarized signal (or vice versa) in a circular waveguide. They operate over a maximum bandwidth of 10% of the center frequency with a typical axial ratio of 1 dB. The polarizers can be connected to an orthomode transducer or circular-to-rectangular transition as applicable.

Millitech series WAC circular-to-rectangular waveguide adapters are available to provide transition from standard rectangular waveguide to circular waveguide. These adapters can be used with conical and scalar feedhorns, and provide wide bandwidth with low VSWR. Transitions to convert appropriate rectangular waveguide bands to applicable circular waveguide are available in a complete range of flange patterns.

Mechanical Specifications

Linear-circular Polarizers
Model Number POL-42 POL-28 POL-22 POL-19 POL-15 POL-12 POL-10 POL-08 POL-06
A (in/mm) 1.50/38.1 1.38/35.052 1.23/31.242 1.03/26.162 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4
Circular-to-rectangular Waveguide Adapters
Model Number WAC-42 WAC-28 WAC-22 WAC-19 WAC-15 WAC-12 WAC-10 WAC-08 WAC-06
A (in/mm) 2.0/50.8 1.50/38.1 1.25/31.8 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4

Outline Drawings*

Series POL

Series POL Linear Circular Polarizer Outline Drawing

Series WAC

Series WAC Circular-to-rectangular Waveguide Adapters Oitline Drawing

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

Electrical Specifications

Performance Parameter Linear-circular Circular-to-rectangular
Waveguide Adapters
Frequency range (GHz) 18 to 170 18 to 170
Axial ratio, 10% bandwidth (dB) (typ) 1.0 ---
Cross-polarization isolation (dB) (typ) --- >25
VSWR (typ) 1.3:1 1.15:1

How To Order

Specify Model Number
WAC-XX-ABBBC*
(circular-to-rectangular waveguide adapters)
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)
BBB = Circular Waveguide Diameter (in)
  • See Waveguide Sizes Table (below)
C = Flange Type (circular waveguide)
  • 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)

*Please specify frequency range when ordering

Specify Model Number
POL-XX-ABBB0*
(linear-circular polarizers)
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)
BBB = Circular Waveguide Diameter (in)
  • See Waveguide Sizes Table (below)

*Please specify center frequency or 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.