Agilent
11691D/11692D
Directional Couplers
2 to 18 GHz
Product Overview
2
Broadband 20 dB
directional couplers
Models 11691D and 11692D high
directivity couplers are precision
instruments designed for broadband swept reflectometer applications in the 2 to 18 GHz
frequency range. With their wide
frequency coverage, one of these
couplers can replace several couplers without performance degradation, thus adding convenience
and economy to swept reflection
and transmission coaxial
microwave measurements by
reducing setup and calibration
time. In addition, the broad frequency coverage of the 11691D
directional coupler makes it ideal
for leveling applications of broadband sources. Its high directivity
makes it possible to achieve excellent source matches not achievable
with directional detectors.
Specifications
Simultaneous reflection and
transmission measurement
These couplers are ideal in
reflectometry measurements.
The reflection and transmission
characteristics of a device can be
measured conveniently from 2 to
18 GHz. Figure 1 shows a test configuration in which an 11692D
dual coupler and an 11691D single
coupler are used to separate and
isolate the incident, reflected, and
transmitted signals in a sweptfrequency measurement of reflection and transmission. These signals are detected and their ratio
displayed on a CRT. The 11691D
single coupler compensates in the
transmitted signal for the coupling
variations “seen” by the reference
detector.
The compensated ratio (Etran/Eref),
being virtually f lat, permits highresolution transmission measurements. These couplers are ideal
companions for the 8755
frequency response test set, a 0.1
to 18 GHz detection and display
system.
Figure 1. Setup for simultaneous swept measurement of insertion loss (A/R)
and return loss (B/R), using 11691D and 11692D couplers.
11691D 11692D
Frequency range 2 to 18 GHz 2 to 18 GHz
Minimum directivity 2 to 8 GHz: 30 dB 2 to18 GHz: 30 dB
8 to 18 GHz: 26 dB
1
8 to 18 GHz: 26 dB
1
Maximum primary line SWR 2 to 12.4 GHz: 1.3 2 to 12.4 GHz: 1.3
12.4 to 18 GHz: 1.40 12.4 to 18 GHz: 1.40
Maximum auxiliary port(s) SWR 1.3 1.3
Nominal coupling (dB) 20 20
Maximum coupling variation with frequency (dB) ±1 dB ±l dB
2
Tracking auxiliary arms * ±0.7 dB3*
Maximum primary line residual loss < 2 dB < 1.5 dB
Primary line power 50 Ω average 50 Ω average
Handling capability 250 Ω peak 250 Ω peak
Net weight 1.93 kg (4 1b, 4 oz) 2.72 kg (6 1b, 0 oz)
Dimensions 404.8 mm (15-15/16 in) L 404.8 mm (15-15/16 in) L
133.4 mm (5-1/4 in) H 133.4 mm (5-1/4 in) H
42.9 mm (1-11/16 in)W 42.9 mm (1 -11/16 in)W
11691D connector
Primary line
Option Input/output Auxiliary arms
Standard APC-7/APC-7 N(f)
11692D connector options
Primary line Auxiliary arms
Option Input/output Incident/reflection
11692D-005 N(f)/APC-7 N(f)/N(f)
11692D-001 N(f)/N(f) N(f)/N(f)
11692D-002 N(f)/N(m) N(f)/N(f)
11692D-003 N(f)/APC-7 APC-7/APC-7
11692D-004 APC-7/APC-7 APC-7/APC-7
Connectors
The APC-7 and type-N connectors are stainless steel
designed for durability. The type-N connectors conform to MIL -C-39012 or MIL-C-71.
3
1. 24 dB with type-N connector on the INPUT PORT (11691D) or TEST PORT (11692D).
2. Incident to test port.
3. With the test port shorted and not including source match ripple.
* Typical tracking between 11691D and 11692D is ±0.07 dB.
Figure 2. Directivity specifications.
Figure 3. Typical coupling curve.
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Product specifications and descriptions in this
document subject to change without notice.
© Agilent Technologies, Inc. 2001, 2002
Printed in USA, September 18, 2002
5952-1145
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