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Keysight Technologies
87300B,C,D and 87301B,C,D,E
Directional Couplers
87310B Hybrid Coupler
Technical Overview
Introduction
The Keysight Technologies, Inc. 87300 series of compact, broadband directional/sampling and hybrid
couplers are well suited for signal monitoring or, when combined with a coaxial detector, signal level-
ing. See page 2 for the wide range of product offerings.
Product Applications
These compact, broadband directional couplers are important components for many microwave
measurement systems. Although most modern signal generators and sweepers supply signals whose
power levels are stable with respect to frequency, variations in signal level are introduced due to the
cable losses (which increase with frequency) and the frequency response of other components in the
signal path. Inserting a directional coupler into the system with a suitable microwave detector to sup-
ply feedback to the ALC circuit of a signal generator or sweeper provides a leveled signal at a particu-
lar point in the system (Figure 8).
Keysight 8474B,C,E detectors offer excellent broad-band frequency response and low SWR for this
application. Other applications include power monitoring with an 848X series power sensor connected
to the sampling port. Connect the sampled signal port to a microwave counter to monitor frequency
or to a signal analyzer for frequency spectrum monitoring (Figure 9).
(See Figures 8 and 9 on page 4.)
Features and Description