STA-60-28-P1-2

Rev. 1.1

Description:
Model STA-60-28-P1-2 is a motorized, programmable rotary
vane attenuator for use in millimeterwave systems acrossthe standard Ka-band frequency range of 26.5 to 40 GHz. The
attenuation control is an IEEE-488 interface to accommodate
remote operations from 0 to 60 dB. Attenuation increments
are 0.05 dB between 0 and 20 dB and 0.1 dB between 20 and60 dB. On the front panel, a local adjustment switch anddigital readout allow for convenient manual operations.
When used remotely, the local switch can be locked to prevent inadvertent adjustments. The motor
control and interface circuits are custom designed and uniquely packaged within the attenuator
housing. The microprocessor based electronics ramp the speed of a precision stepper motor to ensure
fast and accurate positioning.

Features:•••

Applications:•••

Full Band CoverageHigh Attenuation Accuracy
IEEE-488 Control Port

Test Lab
Instrumentations
Auto Test Set

Electrical Specifications:Parameter
RF Frequency Range
Insertion Loss
Attenuation Range
Attenuation Accuracy
Attenuation Step Size
Return Loss
Power Handling
Operating Voltage

Minimum26.5 GHz

SAGE Millimeter, Inc.

Ka-Band Programmable Attenuator

TypicalMaximum
40 GHz0.5 dB0 dB
60 dB
0.1 dB or 3% of reading, whichever is larger, up to 40 dB
0.05 dB from 0 to 20 dB and 0.10 dB from 20 to 60 dB
22 dB
20 dB
500 mW+24 VDC (100 to 240 VAC Adapter is Supplied)

Mechanical Specifications:
Item
RF Ports
Control Interface
Bias
FinishWeightInsertion Length
OutlineParameter
WR-28 Waveguide with UG-599/U Flange
IEEE-488
2.5 mm Connector
Black Anodized
4.06 lbs.
6.5”
TA-PA

www.sagemillimeter.com | 3043 Kashiwa Street, Torrance, CA 90505
Phone: 424-757-0168 | Fax: 424-757-0188 | Email: sales@sagemillimeter.com
Copyright © 2015 by SAGE Millimeter, Inc.

Page | 1

STA-60-28-P1-2

Rev. 1.1

Typical Attenuation vs. Frequency
100
I.L.

Attenuation (dB)

-10

10 dB
-20

20 dB
30 dB

-30

40 dB
-40

50 dB

-50

60 dB-60
-70
26.5

28

29.5

31

32.5

34

35.5

3738.540

Frequency (GHz)

Mechanical Outline: (Unless otherwise specified, all dimensions are in inches)

SAGE Millimeter, Inc.

Ka-Band Programmable Attenuator

www.sagemillimeter.com | 3043 Kashiwa Street, Torrance, CA 90505
Phone: 424-757-0168 | Fax: 424-757-0188 | Email: sales@sagemillimeter.com
Copyright © 2015 by SAGE Millimeter, Inc.

Page | 2

STA-60-28-P1-2

Rev. 1.1

Note:• National Instrument’s USB adapter, Model #NI GPIB-USB, is highly recommended if a USB
interface is required.
• Calibration accuracy is 0.1 dB or 3% of the reading, whichever is greater, for attenuation ranges
up to 40 dB, 5% up to 50 dB, and “for reference only” above 50 dB.
• The attenuation flatness is ±2% or ±0.5 dB of the indicated value, whichever is greater, for thefrequency band.
• SAGE Millimeter, Inc. reserves the right to change the information presented without notice.
Caution:• Exceeding absolute maximum ratings shown will damage the device.
• Any foreign objects in the waveguide will cause performance degradation and may damage thedevice.

SAGE Millimeter, Inc.

Ka-Band Programmable Attenuator

www.sagemillimeter.com | 3043 Kashiwa Street, Torrance, CA 90505
Phone: 424-757-0168 | Fax: 424-757-0188 | Email: sales@sagemillimeter.com
Copyright © 2015 by SAGE Millimeter, Inc.

Page | 3