Keysight Technologies
8490G Coaxial Attenuators
Technical Overview
Introduction
Key Specifications
– Maximize your operating frequency range for DC to 67 GHz application
– Minimize your measurement uncertainty with low SWR of 1.45 up to
67 GHz
– Improve your measurement confidence with excellent attenuation accuracy
The Keysight Technologies, Inc. 8490G family is a line of precision fixed coaxial
attenuators with performance specified up to 67 GHz. These attenuators use the
1.85 mm coaxial connector, and exhibit excellent SWR and accuracy performance
from DC to 67 GHz. The 8490G family has attenuation values of 3, 6, 10, 20, 30
and 40 dB.
The Keysight 8490G family of 1.85 mm fixed coaxial connectors are assembled
and tested with the same meticulous care as their lower frequency counterparts:
the Keysight 8490D, 8491 and 8493 families. These attenuators are tested on
Keysight precision Network Analyzers to assure full specifications over their entire
frequency range.
03 | Keysight | 8490G Coaxial Attenuators - Technical Overview
Applications
Ruggedness, reliability and small size make these attenuators suitable for
use on bench as well as on system level. With their accuracy and low SWR,
they are ideally suited for extending the range of sensitive power meters for
high power measurements. The same characteristics lend themselves to
applications such as calibration standards and RF substitution measurments.
With their broad DC to 67 GHz frequency range and reasonable cost, general
applications such as the reduction of power level to sensitive components
and instrumentation systems are attractive and appropriate uses for these
attenuators.
Specifications
Specifications describe the instrument’s warranted performance over the
temperature range 0° C to +55° C (except where noted). Supplemental and
typical characteristics are intended to provide typical but non-warranted
performance parameters. These are denoted as “typical”, “nominal”
or “approximate”.
Frequency range
Impedance
Connectors
Power
DC to 67 GHz
(nominal) 50 Ω
1.85 mm
(maximum) 1 W average
Attenuation (dB) = Insertion Loss
Options
8490G 003
8490G 006
8490G 010
8490G 020
8490G 030
8490G 040
Min (GHz)
0 to 67
2.5
5.4
9.4
19.2
29.2
38.0
Max (GHz)
0 to 26.5
3.9
6.9
10.9
21.3
31.3
42.5
Max (GHz)
26.5 to 50
4.4
7.4
11.1
21.5
31.5
42.5
Max (GHz)
50 to 67
4.8
7.8
11.3
21.7
31.7
42.5
Atten. Data
Uncert. (dB)
Max (GHz)
0.4 to 67
±0.3
±0.3
±0.3
±0.3
±0.3
±0.6
SWR (Maximum)
Options
8490G 003
8490G 006
8490G 010
8490G 020
8490G 030
8490G 040
(GHz)
0 to 26.5
1.15
1.15
1.15
1.15
1.15
1.10
(GHz)
26.5 to 50
1.25
1.25
1.25
1.25
1.25
1.15
(GHz)
50 to 67
1.45
1.45
1.45
1.45
1.45
1.25
(GHz)
0 to 26.5
23.1
23.1
23.1
23.1
23.1
26.4
Return Loss (dB)
(GHz)
26.5 to 50
19.1
19.1
19.1
19.1
19.1
23.1
(GHz)
50 to 67
14.7
14.7
14.7
14.7
14.7
19.1
04 | Keysight | 8490G Coaxial Attenuators - Technical Overview
Environmental
Specifications
The 8490G is designed to fully comply with Keysights’ product
operating environment specifications. The following summarizes the
environmental specifications for these products.
Temperature
Operating
Non-operating
Cycling
0° C to +55° C
–55° C to +85° C
–65° C to +120° C, 10 cycles @ 20° C per minute,
20 minutes dwell time per MIL-STD-833F,
Method 1010.8, Condition C (modified)
Humidity
Operating
50% to 95% RH @ 40° C, 24 hour cycling, 5 times.
Shock
Half-sine, smoothed 1000 G @ 0.5 ms, 3 shock pulses per orientation
18 total per MIL-STD-833F, Method 2002,4,
Condition B (modified)
Vibration
Broadband random
50 to 2000 Hz, 7.0 G rms, 15 minutes, per
MIL-STD-833F, Method 2026-1 (modified)
Altitude
Operating
Storage
< 4,600 meters (15,000 feet)
< 15,300 meters (50,000 feet)
Mechanical
Dimension
Net weight
7.2 g (0.0158 lb) 3, 6, 10, 20 dB
7.5 g (0.0165 lb) 30, 40 dB
Figure 1. 8490G product outline
05 | Keysight | 8490G Coaxial Attenuators - Technical Overview
Supplement
Characteristics
(typical)
Figure 2. 8490G-003 typical insertion loss versus frequency
Figure 3. 8490G-003 typical return loss versus frequency
Figure 4. 8490G-006 typical insertion loss versus frequency
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