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 broad-
band swept reflectometer applica-
tions in the 2 to 18 GHz
frequency range. With their wide
frequency coverage, one of these
couplers can replace several cou-
plers without performance degra-
dation, thus adding convenience
and economy to swept reflection
and transmission coaxial
microwave measurements by
reducing setup and calibration
time. In addition, the broad fre-
quency coverage of the 11691D
directional coupler makes it ideal
for leveling applications of broad-
band sources. Its high directivity
makes it possible to achieve excel-
lent 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 con-
figuration 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 swept-
frequency measurement of reflec-
tion and transmission. These sig-
nals 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 flat, permits high-
resolution transmission measure-
ments. 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 dB18 to 18 GHz: 26 dB1
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 dB2
Tracking auxiliary arms * ±0.7 dB3*
Maximum primary line residual loss < 2 dB < 1.5 dB
Primary line power 50 Ωaverage 50 Ωaverage
Handling capability 250 Ωpeak 250 Ωpeak
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 con-
form 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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