• Improve test throughput for
multiport devices
• 50 ohm and 75 ohm versions
• Solid-state or mechanical
switching
Easily test multiport devices
Many of today’s wireless communications, broadband, and cable-television
components have three or more
ports. These components require multiple connections for complete characterization with a two-port network
analyzer. You can simplify high-volume tuning and testing of these
devices by using a multiport test set
between the device under test (DUT)
and your network analyzer. These
test sets are useful for a variety of
multiport components such as:
• duplexers
• directional couplers
• circulators
• transmitter combiners
• receiver multicouplers
• distribution amplifiers
• cable-television multitaps and
splitters
Improve throughput
Multiport test sets dramatically
reduce overall tune and test times
because the DUT only needs to be
connected once to test multiple signal
paths. Minimizing the number of
connections also reduces operator
fatigue and lowers the chance of connection to the wrong port. In addition,
fewer connections means less wear
on cables, connectors, fixtures and
DUTs.
Wide range of measurement
solutions
Agilent Technologies multiport test
sets can be customized to your measurement application with any number
of ports, and a variety of connector
types and switching arrangements.
In their simplest configuration, they
serve as switch matrices between
your multiport device and any twoport network analyzer with an internal or external test set. Alternatively,
they can be configured with internal
couplers or bridges as well as switches. This allows consolidation of both
the signal-splitting and switching
functions into one test set for optimal
performance. These test sets are
available in both 50 ohm and 75 ohm
versions, with electromechanical or
solid-state switching. Mechanical
switches offer the lowest loss and
best isolation, while solid-state
switching provides fast and highly
repeatable measurements. All
unused test ports are terminated
internally to reduce unwanted
reflections.
Agilent 87050A/B, 87075A/B
Custom Multiport Test Sets
Product Overview
2
Wireless Communications
Applications
Fast duplexer tune and test
Duplexers are three-port filters used
to separate transmitted and received
signals that share a common antenna.
When using a duplexer test set with
only one internal switch as shown in
Figure 1A, you can simultaneously
measure the insertion loss from
transmitter to antenna ports and
antenna to receiver ports. This
allows both sides of the duplexer to
be tuned and tested at the same time.
Path interactions can also easily be
observed on the instrument display
as shown in Figure 2, eliminating the
retest and rework that occurs when
only one path at a time is measured.
A duplexer test set also allows you to
measure return loss of all three ports
of the DUT. When limit-line displays
are used with multiport test sets,
pass-fail testing of return loss, insertion loss, bandwidth, and stopband
rejection is fast and repeatable. If you
need to test the isolation between the
transmit and receive ports of the
duplexer, a full three-port test set is
required for single-connection measurements.
Full three-port testing
Transmission measurements between
all three ports of a device can be
accomplished by adding two more
switches to a duplexer test set, as
shown in Figure 1B. These measurements are often required for threeport components such as directional
couplers, and circulators. A full
three-port test set also allows you to
measure isolation between the transmitter and receiver ports of a duplexer.
Figure 1. Multiport test sets can be designed to test a variety of
multiport devices from simple passives to more complicated devices
with active components.
Figure 2. Simultaneous sweeps of the Tx-Ant and Ant-Rx paths improve
duplexer tune and test times.
Figure 1A: Duplexer Test Set
Port 1
Port 2
Test Set
Tx
Rx
ANT
Duplexer
Port 1
Figure 1B: Three-port Test Set
Port 1
Port 2
Test Set
Port 2
Port 1
Port 2
Port 3
Directional
Coupler
Network Analyzer
Ant
Port 1
Port 2
Port 1
Port 2
Port 3
Port 4
Receiver
Multicoupler
Test Set
Figure 1C: Multicoupler Test Set
CH1 S21 log MAG 10 dB/ REF 0 dB
CH2 S12 log MAG REF 0 dB10 dB/
PRm
Duplexer Test - Tx-Ant and Ant-Rx
Cor
Hld
1
PRm
Cor
Hld
CH1 START 775.000 000 MHz
CH2 START 775.000 000 MHz
1
839.470 000 MHz
1
880.435 000 MHz
1_ -1.9248 dB
1_ -1.2468 dB
PASS
PASS
STOP 925.000 000
STOP 925.000 000 MHz
MHz
2
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