Atec Agilent-11691D User Manual

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.