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

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Motorized Waveguide Attenuators - MWA

Features:

  • Front panel keypad for 'manual' operation
  • LCD screen
  • GPIB and Ethernet compatibility
  • Dual controller availability
  • 0 to 60 dB in less than 5 seconds
  • Status LED indicators

Applications:

  • Automated test equipment
  • Systems use with AGC requirements
  • Automated data acquisition

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Download the MWA specsheet (.pdf)

Description

Millitech series MWA motorized waveguide attenuators are rotary vane devices which provide very accurate and repeatable attenuation. They are available for laboratory, ATE, STE, and OEM applications. Attenuation control options include a front panel digital keypad, GPIB interface control, and an optional Ethernet interface. Millitech’s unique no-slip drive mechanism ensures accuracy.

The heart of the controller is a microprocessor which drives a stepper motor to achieve the desired attenuation. This controller provides repeatability and resolution (to 0.1 dB over the ranges of 0 to 59.9 in any of the standard waveguide bands from 18 to 170 GHz). Attenuation values are selected in less than 5 seconds by a quiet DC motor capable of 125,000 incremental steps. Single or ganged units provide low VSWR and insertion loss. Units include internal limits and “homing” reference devices to ensure reliability, repeatability, and long-term accuracy (see typical performance data).

The controller for the attenuator is offered in a single or dual configuration. Selecting the dual configuration allows two attenuators to be controlled by a single controller. Different packaging options are available to satisfy different environments and application requirements.

The instrumental model is a fully packaged version (see outline drawings) which includes all power supplies and is offered with the choice of one or two attenuator controllers. The attenuator can be controlled either locally using the keypad on the instrument’s front panel or remotely using the GPIB or Ethernet interface. This model is offered in two enclosure options: the standard benchtop version and the single controller rack-mountable version.

If motorized operation is not required, Millitech also offers series DRA direct reading attenuators and series LSA level set attenuators.

Typical Performance

MWA - Typical Performance MWA - Typical Performance

Electrical Specifications

Model Number MWA-42 MWA-28 MWA-22 MWA-19 MWA-15 MWA-12 MWA-10 MWA-08*1 MWA-06*1
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
Accuracy to 59.9 dB (dB/%)
(whichever is greater)
0.1/2.0 0.1/2.0 0.1/2.0 0.1/2.0 0.1/2.0 0.1/2.25 0.1/2.5 0.2/3.0 0.3/3.0
Rated power (W) (max) 0.5 0.5 0.5 0.5 0.3 0.3 0.3 0.3 0.3
Insertion loss (dB) (max) 0.5 0.5 0.6 0.7 0.8 1.0 1.0 1.5 2.0
Repeatability (dB) (typ) 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15
Resolution (dB) (typ) 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Attenuation range (dB)*2 (min/max) 0/59.9 0/59.9 0/59.9 0/59.9 0/59.9 0/59.9 0/59.9 0/59.9 0/59.9
VSWR (max) 1.25:1 1.15:1 1.15:1 1.15:1 1.2:1 1.2:1 1.2:1 1.5:1 1.5:1

*1 - Calibrated range limited to 30 dB above 110 GHz.
*2 - Calibration data supplied to 50 dB.

Outline Drawings

Motorized Waveguide Attenuator

MWA - Motorized Waveguide Attenuator

Instrumentation Model Controller Panel

MWA - Instrumentation Model Controller Pannel

Mechanical Specifications

Model Number MWA-42 MWA-28 MWA-22 MWA-19 MWA-15 MWA-12 MWA-10 MWA-08 MWA-06
A (in/mm) 8.07/205.0 6.89/175.0 5.90/149.7 4.92/125.0 3.94/100.1 3.94/100.1 3.94/100.1 3.542/89.96 3.542/89.96
B (in/mm) 3.23/82.04 3.23/82.04 3.23/82.04 2.36/59.94 2.36/59.94 2.23/59.94 2.36/59.94 2.36/59.94 2.36/59.94
C (in/mm) 0.633/16.07 0.633/16.07 0.633/16.07 0.200/5.08 0.200/5.08 0.200/5.08 0.200/5.08 0.200/5.08 0.200/5.08
Flange MIL.F-3922 /54-001* /54-003* /67B-006 /67B-007 /67B-008 /67B-009 /67B-010 /67B-M08 /67B-M06

*With #4-40 threaded holes.

How to Order

Motorized Waveguide Attenuator
Specify Model Number
MWA-XX-Y0000
XX =Waveguide Band
  • WR – number
Y= Flange Type
  • A – Precision, Flat (WR-06 and WR-08 only)
  • R – Round (WR-10 through WR-28 only)
  • S – Square (WR-42 and WR-28 only)

MWA Controller with Cable
Specify Model Number
MWA-00-ABCDE
00 = MWA Controller
A = Power Supply Voltage Options
  • 3 – 100 -240 VAC
B = Model Configuration Options
  • I – instrumentation model (benchtop version)
  • R – single rack mounted version
C = Interface Options
  • G – GPIB interface
  • E – GPIB and Ethernet interface
D = Length of cable (in feet)
  • 6 – 6 feet (standard)
  • L – other length (please specify)
E = Single or Dual
  • 1 – single controller configuration
  • 2 – dual controller configuration