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

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Series GOA

Gaussian Optics Lens Antenna

MMW Gaussian Optics Lens Antenna

Features:

  • Wide bandwidth
  • Highly efficient, low loss
  • Low sidelobes and VSWR
  • Integral radome/lens
  • Polarization options offered

Applications:

  • Communication systems
  • Radars and remote sensing
  • Surveillance/EW/ELINT
  • Plasma diagnostics
  • Monopulse tracking

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Download the GOA specsheet (.pdf)

Description

Millitech series GOA Gaussian optics lens antennas form well-defined Gaussian beams through the use of corrugated feedhorns and efficient dielectric lenses. Their radiation patterns are characterized by circular symmetry, high efficiency, and low sidelobes.

In Gaussian optics transmission, the propagating signal is not confined by metal or by dielectric walls, but travels in free space, resulting in a very low loss system. The beam can be separated into its orthogonally - polarized components for dual polarization operation or utilized in the single polarization mode.

GOA antennas are available in waveguide bands from 18 to 220 GHz, with a typical net efficiency of 50%. Sidelobes are 23 typical, and VSWR is 1.5:1 typical.

The series GOA is available in single or dual polarization. The single polarization GOA can support linear or circular polarization. It can also be configured as a dual polarization antenna by attaching a series OMT orthomode transducer to the output circular waveguide of the antenna.

Dual linear polarization is achieved by incorporating a free-standing wire grid polarizer in the antenna. Cross polarization isolation is outstanding at > 30 dB.

A lens antenna with its beam focused at a finite distance (typically a few lens diameter’s length in front of the lens) can be configured for applications requiring a spot beam focus. This configuration is offered with either a single antenna or a pair of antennas, depending on customer requirements. This option is particularly useful for near-field applications such as plasma diagnostics, material properties measurement, and certain short-range probes. Focusing Gaussian optics lens antennas are produced as a custom product to meet specific application requirements.

For subsystems such as receivers, transmitters, transceivers, radios, and measurement instruments, Millitech can integrate the remaining subsystem and antenna within the same housing. This results in a reduced package size for the total assembly. Custom diameters, materials, and configurations are available. Please consult our sales department for details.

Mechanical Specifications (examples)

A Lens Diameter (in/mm) 3.00/76.2 6.00/76.2 9.00/228.6 12.00/304.8
B Housing Diameter (in/mm) 3.75/95.3 7.00/177.8 10.80/273.1 12.75/323.9
C Housing Length (in/mm)* 3.25/82.6 6.25/158.8 9.63/244.6 12.00/304.8

*These lengths are typical and can vary ±0.5 in/13 mm depending on the frequency band.


Outline Drawings*

MMW Gaussian Optic Lens Antenna Outline Drawing

Single Polarization

MMW Gaussian Optic Lens Antenna Single Polarization

Dual Polarization

MMW Gaussian Optic Lens Antenna Dual Polarization

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

Electrical Specifications

Performance Parameter Range Remarks
Frequency range (GHz) 18 to 220* Practical range for waveguide feeds.
Lens diameter (in/cm) 3/7.62
6/15.24
9/22.86
12/30.48
Other diameters available as custom products.
Beam angles (degrees) (nom) 0.1 to 10 Depending on lens diameter selected and frequency of operation.
Gain (dBi) (nom) 25 to 50 Depending on lens diameter selected and frequency of operation.
Sidelobes (dB) (typ) 23 Depending on lens size and requirements.
VSWR (typ) 1.5:1 Return loss 14 dB typical.
Cross polarization isolation (dB)
(dual polarization version)
>30 Scalar feed with polarizer grid provides very high cross polarization isolation.

* Other ranges available upon request. Please consult Millitech for details.

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.

How to order

Specify Model Number
GOA-XX-ABBBCCD*
XX = Waveguide Band
  • WR – number
A = Flange Type
  • R – round (WR-28 through WR-05 only)
  • 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 (above)
  • Specify ØØØ for rectangular waveguide output
CC = Lens Diameter (in/cm)
  • 03 – 3/7.62 cm
  • 06 – 6/15.24 cm
  • 09 – 9/22.86 cm
  • 12 – 12/30.48 cm
D = Polarization/Special Options
  • S – single polarization
  • D – dual polarization (6 in. lens diameter and above)
  • F – focusing version (specify complete requirements)
*Please specify frequency range when ordering