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Prevision and General Purpose Fixed Attenuators, Level Set Attenuators, and Veriable Phase Shifters - FXA-LSA-VPS

Features:

  • Fixed attenuators 0 to 48 dB
  • Level set attenuators 25 dB (min. @ max. setting)
  • Variable phase shifters 0-180°

Applications:

  • Test and instrumenation
  • Laboratory equipment
  • Subsystems

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Download the FXA/LSA/VPS specsheet (.pdf)

Description

Millitech series FXA precision fixed attenuators are made using a rugged split-block design. These devices can be used as the laboratory standard against which other instruments or components are calibrated. Series FXA general purpose and series LSA level set attenuators consist of a section of waveguide with a precisely cut resistive vane. In the level set attenuator, the micrometer drive sets the level of attenuation by movement of the vane.

Series VPS variable phase shifters consist of a waveguide section with a movable dielectric vane driven by a micrometer. The micrometer-driven phase shifters have 180° phase shift range and are offered from 26.5 to 170 GHz. If precise measurements of attenuation are required, series DRA direct reading attenuators are also available.

Electrical Specifications

Model Number FXA-42 FXA-28 FXA-22 FXA-19 FXA-15 FXA-12 FXA-10 FXA-08 FXA-06
General Purpose Fixed Attenuators
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
Attenuation at center frequency range (dB)*1 3, 6, 10, 20, 30, 40
VSWR (max) 1.15:1 1.15:1 1.15:1 1.15:1 1.15:1 1.15:1 1.15:1 1.20:1 1.5:1
Power rating (W) (max)*2 0.5 0.5 0.5 0.5 0.3 0.3 0.3 0.3 0.3
Precision Fixed Attenuators
Attenuation across waveguide band --- 3, 6, 10, 20, 30, 40 --- ---
Accuracy (±dB/%)*3 --- 0.7/4.0 0.7/4.0 0.7/4.0 0.7/4.0 0.7/4.0 0.7/4.0 --- ---
Flatness (±dB) (max)*4 --- 0.7 0.7 0.7 0.7 0.7 0.7 --- ---
VSWR (max) --- 1.05:1 1.05:1 1.06:1 1.08:1 1.08:1 1.08:1 --- ---
Power rating (W) (max) --- 1.0 1.0 1.0 1.0 0.5 0.5 --- ---

*1 – ±0.3 dB at center frequency. Please contact Millitech for attenuation values over full bandwidth.
*2 – Higher power versions are available in all frequency bands. Please contact Millitech for details.
*3 – Whichever is greater throughout the waveguide band.
*4 – Flatness within the entire waveguide band.

Model Number LSA-42 LSA-28 LSA-22 LSA-19 LSA-15 LSA-12 LSA-10 LSA-08 LSA-06
Level Set Attenuators
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
Attenuation (dB)*1 0-25 0-25 0-25 0-25 0-25 0-25 0-25 0-25 0-25
Insertion loss (dB) (max) 0.5 0.5 0.5 0.7 0.7 1.0 1.0 1.2 1.2
VSWR (max) 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.5:1
Power rating (W) (max)*2 0.5 0.5 0.5 0.3 0.3 0.3 0.3 0.3 0.3
Model Number VPS-42 VPS-28 VPS-22 VPS-19 VPS-15 VPS-12 VPS-10 VPS-08 VPS-06
Variable Phase Shifters
Insertion loss (dB) (max) --- 0.5 0.5 0.7 0.7 1.0 1.0 1.2 1.2
Phase shift range (degrees)*3 --- 0-180 0-180 0-180 0-180 0-180 0-180 0-180 0-180
VSWR (max) --- 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.3:1 1.5:1
Power rating (W) (max) --- 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5

*1 – Micrometer reading vs. attenuation value available upon request.
*2 – Higher power versions are available in all frequency bands. Please contact Millitech for details.
*3 – Measurements are made at the lowest frequency of the waveband guide.

Outline Drawings*

FXA Models

Precision Fixed

FXA Models - Precision Fixed

General Purposed Fixed

FXA Models - General Purposed Fixed

LSA and VPS (dimensions in inches)

LSA and VPS - Outline Drawings

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

Mechanical Specifications

Model Number FXA-42 FXA-28 FXA-22 FXA-19 FXA-15 FXA-12 FXA-10 FXA-08 FXA-06
General Purpose Fixed Attenuators
A (in/mm) 2.0/51 2.0/51 2.0/51 2.0/51 1.6/41 1.6/41 1.6/41 1.6/41 1.6/41
Precision Fixed Attenuators
A (in/mm) *1 7.26/184 6.08/154 5.32/135 3.98/101 3.31/84 3.12/79 --- ---
B (in/mm) *1 0.93/24 1.30/33 1.30/.33 0.86/22 0.86/22 0.86/22 --- ---
C (in/mm) *1 1.33/34 1.33/34 1.33/34 1.20/30 1.20/30 1.20/30 --- ---
Model Number LSA-42 LSA-28 LSA-22 LSA-19 LSA-15 LSA-12 LSA-10 LSA-08 LSA-06
Model Number VPS-42 VPS-28 VPS-22 VPS-19 VPS-15 VPS-12 VPS-10 VPS-08 VPS-06
Level Set Attenuators/Variable Phase Shifters
A (in/mm) *1 3.45/88 3.40/86 3.40/86 3.25/83 3.25/83 3.25/83 3.17/81 3.17/81
Flange MIL.F-3922 /54-001*2 /54-003*2 /67B-006 /67B-007 /67B-008 /67B-009 /67B-010 /67B-M08 /67B-M06

*1 - Please contact Millitech for dimensions.
*2 - With #4-40 threaded holes.

How to Order

Specify Model Number
LSA-XX-A0000
VPS-XX-A0000
FXA-XX-ABBC0
XX =Waveguide Band
  • WR – number
A= Flange Type
  • R – round (not available in WR-42)
  • S – square (WR-42 and WR-28 only)
  • N - nonstandard (not available for precision fixed attenuators)
BB= Attenuation Values*
  • 03 – 3 dB
  • 06 – 6 dB
  • 10 – 10 dB
  • 20 – 20 dB
  • 30 – 30 dB
  • 40 – 40 dB
C= Attenuator Type
  • G – general purpose fixed version
  • P – precision fixed version (WR-28 through WR-10 only)
*Custom attenuation values available upon request for general purpose fixed attenuators.