1EZ37_1E
Multiport Measurements
using
Vector Network Analyzer
ZVR
Application Note 1EZ37_1E
Subject to change
10 October 1997, Olaf Ostwald
Products:
ZVR with option ZVR-B8, ZVR-B14 or ZVR-B26
ZVRE with option ZVR-B8, ZVR-B14 or ZVR-B26
ZVRL with option ZVR-B8
CONTENTS
PAGE
1
Abstract
Using the optional three-port or four-port adapter
(ZVR-B8 and ZVR-B14), PORT 1 and PORT 2 of
the network analyzers of the ZVR family (ZVRL,
ZVRE and ZVR) can be expanded to up to four
ports. Thus automatic measurements on threeand four-port DUTs can be easily performed
without any reconnection of ports being required.
With the electronic switches in the adapters,
switchover between the various ports is fast to the
extent that the known high measurement and
display speed of the analyzers of the ZVR family
is fully maintained.
1
ABSTRACT
2
2
OVERVIEW
2
3
THREE-PORT MEASUREMENT
3
3.1
DESCRIPTION OF 3-PORT ADAPTER
3
3.2
USE
3
4
FOUR-PORT MEASUREMENTS
5
4.1
DESCRIPTION OF 4-PORT ADAPTER
6
4.2
USE
7
4.2.1
GENERAL
7
4.2.2
MODEL 02
8
4.2.3
MODEL 03
9
4.3
EXTRA INPUTS, 4-PORT
11
Four different options permit measurements on
three- or four-port networks to be performed:
5
SUMMARY
12
• ZVR-B8:
5.1
3-PORT ADAPTER
12
5.2
4-PORT ADAPTER, MODEL 02
12
• ZVR-B14 model 02: Four-Port Adapter
"2 x SPDT"
5.3
4-PORT ADAPTER, MODEL 03
12
5.4
EXTRA INPUTS, 4-PORT
12
6
FURTHER APPLICATION NOTES
13
7
ORDERING INFORMATION
13
PORT 1
2
Overview
Three-Port Adapter
• ZVR-B14 model 03: Four-Port Adapter
"SP3T"
• ZVR-B26:
Extra Inputs, 4-Port
Each option offers different advantages which will
be described in the following.
PORT 3
PORT 2
FIG. 1: Drawing on cover of 3-Port Adapter ZVR-B8
1EZ37_1E.DOC
2
29 May 1998
3
Three-Port Measurements
3.2
The 3-port adapter is an optional extra to be used
with all Network Analyzers of the ZVR family, ie
ZVRL, ZVRE and ZVR. It extends PORT 1 and
PORT 2 of the network analyzer to three ports,
PORT 1, PORT 2 and PORT 3. It is provided with
an electronic switch which connects PORT 1 of
the analyzer to PORT 1 or PORT 3 of the 3-port
adapter. PORT 2 of the analyzer is directly
connected to the PORT 2 of the adapter and is
not switched. The 3-port adapter is driven via an
optional interface at the rear.
3.1
The 3-port adapter is particularly suitable for
measuring special three-port DUTs such as
antenna diplexers. In practice, a transmitter
signal is applied to the first port of the diplexer.
The signal is then routed through the diplexer to
the second port which is normally connected to a
transmitting/receiving antenna. The received
signal is routed through the diplexer to the third
port to which a receiver is normally connected.
For measurements on the antenna diplexer, the
generator input of the diplexer is connected to
PORT 1, the antenna input/output to PORT 2 and
the receiver output to PORT 3 of the 3-port
adapter. If a bidirectional network analyzer, ie
ZVRE or ZVR, is used, the reflection can be
measured at all three ports of the diplexer, as well
as the transmission between port 1 and port 2
and that between port 2 and port 3 and vice
versa. (With the unidirectional Network Analyzer
ZVRL only the forward S-parameters S11, S21,
S23 and S33 can of course be measured). Direct
measurement of transmissions between port 1
and port 3 is not possible because the two ports
are connected to the same analyzer port, ie
PORT 1, through the switch of the three-port
adapter.
Description of 3-Port Adapter
Design and function of the 3-port adapter can be
seen from the drawing on the adapter cover (see
FIG. 1). The adapter comprises an electronic
switch (SPDT = single pole double throw) with
field-effect transistors permitting signals between
9 kHz and 4 GHz to be switched virtually wattless
and without delay. Its insertion loss is typically
1.6 dB at 9 kHz and increases to approx. 4.2 dB
at 4 GHz. The deactivated port, eg PORT 3 (with
PORT 1 through-connected), is terminated with a
low-reflection 50 Ω resistor.
The 3-port adapter is driven with the TTL signal
CHNBIT0 via the optional rear-panel MULTIPORT
ADAPTER interface (former name: 3-PORT
ADAPTER). In analyzers of the ZVR family, the
status of this signal changes synchronously with
the active display channel (CH 1 to CH 4) if the
decoupled channels mode is selected, ie:
Thus the 3-port adapter permits seven of the
three times three - ie nine - S-parameters of a
three-port DUT to be directly measured without
the need to reconnect the DUT. The seven
parameters are written in bold in the following
general S-parameters matrix of any three-port
device.
[SWEEP]: COUPLED CHANNELS = OFF.
• For the two odd display channels, ie CH 1
and CH 3, the switch is in position PORT 1.
(S) =
• For the two even display channels, ie CH 2
and CH 4, the switch is in position PORT 3.
1EZ37_1E.DOC
Use





S11
S12
S13
S21
S22
S23
S31
S32
S33





The two remaining S-parameters S13 and S31
may be measured after reconnecting the DUT.
However, these parameters need not be known in
practical applications. With the aid of the 3-port
adapter all key S-parameters of a DUT can be
measured quasi simultaneously. Up to four
S-parameters can be displayed at the same time
on the network analyzer next to or on top of each
other.
3
29 May 1998
Other applications are also possible provided
the 3-port adapter is not driven with the previously
mentioned TTL signal CHNBIT0 but with the
alternative TTL signal CHNBIT1 which is also
available at the rear analyzer interface. In this
case a minor modification has to be made on the
control board of the 3-port adapter. The CHNBIT1
signal too changes its state synchronously with
the active display channel but it assumes one
status for the two lower channels CH 1 and CH 2
and the other for the two higher channels CH 3
and CH 4. This means that the switch is in
position PORT 1 when display channel CH 1 or
CH 2 is active and in position PORT 3 when
display channel CH 3 or CH 4 becomes active.
A typical measurement example is the
simultaneous test of the two transmission paths of
a diplexer. If, for instance, the transmission
coefficient S21 from PORT 1 to PORT 2 and S23
from PORT 3 to PORT 2 is to be measured, S21
can be displayed in channel CH 1 (PORT 1
through-connected) and S23 in channel CH 2
(PORT 3 through-connected). Switchover
between the two decoupled display channels and
therefore between the two measurement paths of
the diplexer is performed automatically after each
sweep. For example, with 400 test points per
channel and a measurement bandwidth of
10 kHz, a switchover is performed every 200 ms.
Thus changes in the transmission characteristics
of the diplexer can be followed on the analyzer
display in real time and the DUT can be adjusted
without delay.
If two 3-port adapters are used, one driven with a
CHNBIT0 and the other with a CHNBIT1 signal,
4-port DUTs can be measured. If, for instance,
ports 1 and 2 of the DUT are connected to the
first 3-port adapter and ports 3 and 4 to the
second, reflection coefficients can be measured
at all four ports of the DUT. Eight of the twelve
transmission coefficients can be measured as can
be seen in TABLE 1 below.
Note:
Regarding the S-parameter display, the value
indicated at the very left in the top line of the
analyzer display always refers to test ports
PORT 1 and PORT 2 of the analyzer irrespective
of whether a 3-port adapter is used or not and of
the adapter switch position.
Consequently, S21 will always be displayed
irrespective of whether S21 or S23 is measured,
as in both cases the forward transmission
coefficient from PORT 1 to PORT 2 of the
network analyzer is measured.
Additional parameters can be displayed in the
other available display channels. For instance, the
match S11 of the DUT at PORT 1 can be
displayed in channel CH 3 (PORT 1 throughconnected) and the match S33 at PORT 3 in
display channel CH 4 (PORT 3 throughconnected).
CH 1
CH 2
CH 3
CH 4
CHN
BIT 1
1
1
0
0
CHN
BIT 0
1
0
1
0
Switch
position
PORT 1
PORT 3
PORT 1
PORT 3
S31
S32
S41
S42
and S13
and S23
and S14
and S24
4-port Sparam.
TABLE 1:
Four-port measurement using two
3-port adapters
To enhance the measurement accuracy, a
commonly used error correction method, eg TOM,
can be used. It is recommended to perform a
separate calibration in each of the decoupled
display channels. During operation, an automatic
switchover between the associated, independent
calibration data sets is performed synchronously
with the channel change and the switchover of the
3-port adapter. Switching is fast to the extent that
the high measurement speed of the network
analyzers of the ZVR family is fully maintained.
A combination of two 3-port adapters allows
also further measurements to be performed. For
instance, if the switch input of one 3-port adapter
is connected to PORT 1 of the network analyzer,
and the second 3-port adapter to PORT 2 of the
analyzer, two two-port DUTs can be measured
simultaneously. Thus the DUTs can be directly
compared and easily adjusted. The two 3-port
adapters are driven in parallel from the rear
analyzer interface via a simple Y cable.
1EZ37_1E.DOC
Display
channel
4
29 May 1998
4 - PORT ADAPTER . ZVR - B 14
1106.7510.02
ACTIVE PORTS:
(for decoupled channels only)
CH 1
1
CH 3
2
1
CH 2
3
PORT 1
4
CH 4
2
3
PORT 3
4
PORT 4
PORT 2
FIG. 2: Drawing on cover of model 02 of 4-Port Adapter ZVR-B14
4
Four-Port Measurements
PORT 2, PORT 3 or PORT 4. Thus model 03 is
particularly suitable for measuring DUTs with one
input and three outputs or vice versa, eg filter
banks, where the transmission coefficient is to be
measured between one port and the three others.
The 4-port adapter is used to expand test PORT 1
and test PORT 2 of the network analyzers of the
ZVR family to four ports, PORT 1, PORT 2,
PORT 3 and PORT 4. The 4-port adapter comes
in two models (02 and 03) with different switching
functions so the models are suitable for particular
types of four-port DUTs.
If a bidirectional network analyzer is used, both
models of the 4-port adapter permit simultaneous
measurements of the reflection at all four ports of
the DUT or measurements of up to four different
transmission coefficients or combinations of
reflection and transmission measurements. In all
cases the complete range of capabilities of the
vector network analyzers of the ZVR family, eg a
variety of display modes, complex evaluation
functions and a wide range of system error
calibration methods, can be used independently
for any of the four selected parameters.
Model 02 (see FIG. 2) comprises two
independent switches (SPDT). The first switches
PORT 1 of the analyzer to PORT 1 or PORT 3 of
the 4-port adapter. The second switches PORT 2
of the network analyzer to PORT 2 or PORT 4 of
the 4-port adapter. This adapter module is
particularly suitable for measuring DUTs with two
inputs and two outputs such as double-pole
switches or directional couplers but also for
simultaneous measurements on two two-port
DUTs, eg two amplifiers or two filters.
The 4-port adapter is powered and driven via the
optional MULTIPORT ADAPTER interface
(former name: 3-PORT ADAPTER) of the network
analyzer.
Model 03 (see FIG. 3), by contrast, connects
PORT 1 of the network analyzer directly to
PORT 1 of the 4-port adapter, while PORT 2 of
the analyzer can be connected to any of the three
remaining ports of the 4-port adapter,
1EZ37_1E.DOC
5
29 May 1998
4 - PORT ADAPTER . ZVR - B 14
PORT 1
PORT 3
PORT 4
1106.7510.03
PORT 2
FIG. 3: Drawing on cover of model 03 of 4-Port Adapter ZVR-B14
4.1
Description of 4-Port Adapters
switches in the right-hand section of the module
are wired such that they act like a 1-to-3 switch
(SP3T = single pole triple throw), as seen from
the outside. Thus PORT 2 of the network analyzer
can be switched to PORT 2, PORT 3 or PORT 4
of the 4-port adapter.
As already mentioned, the 4-port adapter comes
in two models, model 02 and model 03. Both
comprise two electronic switches which are,
however, differently wired so that different
functions are obtained at their interfaces.
Design and basic functions can be seen from the
drawing on the cover of the respective 4-port
adapter.
The two electronic switches are made up of FET
transistors permitting signals between 9 kHz and
4 GHz to be switched virtually wattless and
without delay. The insertion loss in the throughconnected path of the electronic switch is typically
1.6 dB at 9 kHz and increases to 4.2 dB at 4 GHz.
(With model 03 it should be borne in mind that the
insertion loss in the paths to PORT 3 and PORT 4
is twice as high because the switches are seriesconnected.) The disabled ports of the 4-port
adapter, eg PORT 3 and PORT 4 with PORT 1
and PORT 2 through-connected, are terminated
with integrated low-reflection 50 Ω resistors.
Model .02 (see FIG. 2) comprises two switches
(SPDT = single pole double throw). One
switches PORT 1 of the analyzer to PORT 1 or
PORT 3 of the 4-port adapter (left half of module),
the other PORT 2 of the network analyzer to
PORT 2 or PORT 4 of the 4-port adapter (right
half of module).
Model .03 (see FIG. 3) also comprises two
switches. In contrast to model 02, in this model
PORT 1 of the analyzer is directly connected to
PORT 1 of the 4-port adapter (left section of
module) and is not switched. The two electronic
1EZ37_1E.DOC
6
29 May 1998
4.2
Applications
(S) =
4.2.1 General
The 4-port adapter allows a variety of four-port
DUTs to be measured (also two two-ports, a
three-port and a one-port or four one-ports). A
standard four-port DUT is defined by its
scattering matrix (four times four, ie sixteen
S-parameters).
(S) =







S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44
S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44







S-parameters measured with model 03
The 4-port adapter is operated via the optional
MULTIPORT ADAPTER interface at the rear,
which was introduced under the name 3-PORT
ADAPTER for the 3-port adapter and has now
been renamed.







Control of the two switches in the 4-port adapter is
such that in the case of decoupled ZVR display
channels ([SWEEP]: COUPLED CHANNELS =
OFF) different paths of the 4-port adapter are
through-connected depending on the activated
display channel (channel CH 1, CH 2, CH 3 or
CH 4). Models 02 and 03 of the 4-port adapter
behave differently:
S-parameters measured with model 02
With each model of the 4-port adapter all four
reflection coefficients S11 to S44 can be measured
provided a bidirectional network analyzer is used.
Six or eight of the twelve transmission coefficients
S12 to S43 can be determined, depending on the
selected 4-port adapter model.
The exact assignment of active display channel
and through-connected ports of model 02 can be
seen from the table on the cover of the 4-port
adapter (see TABLE 2):
Model 02 is able to measure eight transmission
coefficients. The measurable S-parameters are
written in bold in the matrix above. The four
remaining transmission coefficients S 13, S31, S24
and S42 cannot be determined directly due to the
design of model 02 of the 4-port adapter. To
measure these parameters, the DUT has to be
reconnected or model 03 of the 4-port adapter is
to be used.
CH 1
CH 3
‰‰ô
‰÷‰
CH 2
CH 4
‰í‰ô
‰í÷‰
TABLE 2: Channel assignment of model 02
As can be seen, PORT 1 of the 4-port adapter is
activated for the two odd display channels (CH 1
and CH 3) and PORT 3 for the two even channels
(CH 2 and CH 4). The left-hand switch of the
4-port adapter is actuated each time a switchover
is performed between the odd and even display
channels. The right-hand switch is in position
PORT 2 for the two lower channel numbers (CH 1
and CH 2) and in position PORT 4 for the two
higher channel numbers (CH 3 and CH 4). The
right-hand switch is therefore actuated each time
a switchover is made between the two lower and
the two higher channels.
Model 03 of the 4-port adapter also measures the
four reflection coefficients S 11 to S44 of a four-port
network. Six of the twelve transmission
coefficients S12 to S43 can be measured, ie the
transmissions coefficient from PORT 1 to the
other three ports and vice versa. The measurable
S-parameters are printed in bold in the following
matrix below. Due to the circuit design of model
03 of the 4-port adapter, the remaining six
transmission coefficients, ie S 23, S32, S24, S42,
S34 and S43, cannot be determined directly.
1EZ37_1E.DOC







7
29 May 1998
During switchover from CH 1 to CH 4 the four
possible port combinations of the 4-port adapter
(model 02) are cyclically activated.
4.2.2 Model 02
The following procedure is recommended for
measuring four-port S-parameters using model
02 of the 4-port adapter:
Port designation and channel assignment of
model 02 of the 4-port adapter are selected so
that the CH 1 represents the initial state. In this
case PORT 1 and PORT 2 of the network
analyzer are directly connected to PORT 1 and
PORT 2 of the 4-port adapter. The adapter ports
are of the same construction as the two analyzer
test ports. Same as in the 3-port adapter, PORT 3
of the 4-port adapter is located next to PORT 1.
Thus PORT 1 to PORT 3 of the two adapters are
of identical design and function. PORT 1 of the
analyzer can be through-connected to PORT 1 or
PORT 3 of the 4-port adapter. Symmetrically,
PORT 2 of the analyzer is switched to PORT 2 or
PORT 4 using the 4-port adapter.
1. For the measurement of forward
transmission coefficients (S21, S23, S41, S43),
the S-parameter S21 should be selected as the
parameter in all four display channels.
• [MEAS]: S21
• [SWEEP]: COUPLED CHANNELS = OFF
• [DISPLAY]: QUAD CHANNEL QUAD SPLIT
Provided the display channels are decoupled and
a quad split display is selected, the S-parameters
of the DUT are displayed in the following form:
Assignment of the active display channel and
through-connected test ports of model 03 can be
easily explained: Same as with model 02, port
designations and channel assignment in model
03 of the 4-port adapter are such that CH 1 is
assumed to be in the initial state. In this case
PORT 1 and PORT 2 of the network analyzer are
through-connected to PORT 1 and PORT 2 of the
4-port adapter. The remaining three display
channels cause the corresponding ports of the
4-port adapter to be through-connected, ie PORT
2 for CH 2, PORT 3 for CH 3 and PORT 4 for
CH 4. It can thus be seen that PORT 1 of model
03 is always through-connected (see TABLE 3).
CH 1
CH 3
‰‰ô
í‰‰
CH 2
CH 4
‰‰ô
‰÷‰
S21
S41
S23
S43
2. For the measurement of reverse transmission
coefficients (S12, S32, S14, S34) S12 should be
selected as the parameter in all four display
channels. Under the conditions described above
the following S-parameters of the DUT are
displayed:
S12
S14
S32
S34
3. For the measurement of reflection
coefficients (S11, S22, S33, S44), S11 should, for
example, be selected as the parameter in display
channels CH 1 and CH 4 and S22 in channels
CH 2 and CH 3. All four reflection coefficients of
the DUT are then displayed in the following form:
TABLE 3: Channel assignment of model 03
S11
S44
Same as with model 02, PORT 1 and PORT 2 are
arranged in the same way as the analyzer test
ports. PORT 3 of the 4-port adapter is next to
PORT 1 (as in model 02 and the 3-port adapter).
S22
S33
1EZ37_1E.DOC
Of course, different combination of forward and
reverse transmission and reflection coefficients
can be simultaneously displayed. The exact
configuration is determined by the S-parameter
selected in the different display channels and the
predefined assignment of active display channels
and through-connected test ports.
8
29 May 1998
Provided the display channels are decoupled and
a quad split display is selected, the three
measurable forward transmission coefficients of
the DUT are displayed in the following form:
A system error calibration can be performed as
usual prior to the measurement to increase the
accuracy. In this case it is recommended to
perform a calibration separately for each display
channel and to connect the calibration standards
to the two through-connected ports of the 4-port
adapter (or to the connected test cable). During
operation, up to four system-error correction data
sets are automatically switched upon the channel
change and synchronously with the switching of
the 4-port adapter. The measurement and
switching speed is in all cases high enough for
the DUT to be adjusted without delay.
S21
S31
S21
S41
2. For the measurement of reverse transmission
coefficients (S12, S13, S14 in the top line of the
scattering matrix (S)), S12 is selected as test
parameter in all four display channels. Under the
conditions described above, the three measurable
reverse transmission coefficients of the DUT are
displayed in the following form:
Note:
Regarding the S-parameter display it should be
noted that the S-parameter indicated in the
respective quadrant at the very left of the top line
of the analyzer display always refers to PORT 1
and PORT 2 of the network analyzer irrespective
of whether a 4-port adapter is connected or not or
of the switch positions of the adapter.
S12
S13
S12
S14
3. For the measurement of reflection
coefficients (S11, S22, S33, S44 in the main
diagonal of the scattering matrix (S)), S11 is
selected, for instance, in display channels CH 1
and CH 3 and S22 in display channels CH 2 and
CH 4. The four reflection coefficients are then
displayed in the following form (see also FIG. 4):
Consequently, S21 is always displayed if, for
example, S21 or even S31 is measured, as in both
cases the transmission coefficient from PORT 1
to PORT 2 of the network analyzer is measured.
4.2.3 Model 03
S11
S33
For measuring four-port S-parameters with
model 03 of the 4-port adapter, the following
procedure is recommended:
S22
S44
Of course, different combination of forward and
reverse transmission and reflection coefficients
can be simultaneously displayed. The assignment
is determined by the S-parameter selected in the
different display channels and the predefined
configuration of active display channels and
through-connected test ports.
1. For the measurement of forward
transmission coefficients (S21, S31, S41 of the
first column in the scattering matrix (S)),
parameter S21 should be measured first in all four
display channels.
• [MEAS]: S21
• [SWEEP]: COUPLED CHANNELS = OFF
• [DISPLAY]: QUAD CHANNEL QUAD SPLIT
1EZ37_1E.DOC
9
29 May 1998
FIG. 4: Simultaneous measurement of the four reflection coefficients of a four-port DUT
To increase the measurement accuracy, a
system error calibration can be performed as
usual prior to the measurement. In this case it is
recommended to perform a calibration separately
for each display channel and to connect the
calibration standards to the two throughconnected ports of the 4-port adapter (or to the
test cable connected). During operation, up to
four system-error correction data sets are
automatically switched upon the channel change
and synchronously with the switching of the 4-port
adapter. The measurement and switching
speed is in all cases high enough for the DUT to
be adjusted without delay.
1EZ37_1E.DOC
Note:
Regarding the display it should be noted again
that the S-parameter indicated in the respective
quadrant at the very left of the top line of the
analyzer display always refers to PORT 1 and
PORT 2 of the network analyzer irrespective of
whether a 4-port adapter is connected or not or of
the switch positions of the adapter.
Consequently, S11 is always displayed if, for
example, S11 or even S33 is measured, as in both
cases the reflection coefficient at PORT 1 of the
network analyzer is measured.
10
29 May 1998
4.3
• Press [TRACE]: DATA TO MEMORY: SHOW
MATH with MATH = DATA/MEM.
Extra Inputs, 4-Port
The Extra Inputs option ZVR-B26 is a third
alternative for measurements on four-port
networks. In contrast to the 4-Port Adapter
ZVR-B14 described above, no external adapter is
connected to PORT 1 and PORT 2 but a modified
form of the additional inputs INPUT b1 and
INPUT b2 of the External Measurements option
ZVR-B25 is used as new inputs PORT 3 and
PORT 4 for connecting four-port DUTs (see
TABLE 4). This option is only available for the
bidirectional network analyzers of the ZVR family,
ie ZVRE and ZVR.
Front
panel:
PORT 1 PORT 2 INPUT b1 INPUT b2
4-port:
PORT 1 PORT 2
PORT 3
Normalization for this display channel is
completed and should be performed analogously
for all other display channels. After all four display
channels have been normalized, the DUT can be
connected and measured. For the display of the
first four S-parameters S11 to S22, the 4-PORT
mode is switched off again.
• [MODE]: 4-PORT (softkey is grey again)
To obtain fully corrected test results the trace
mathematics and the UNCAL softkey have to be
switched off again.
• [TRACE]: SHOW DATA and
• [CAL]: UNCAL (softkey is grey again)
PORT 4
TABLE 4: Front panel for option ZVR-B26
The 4-PORT mode can now be selected again
and the remaining four S-parameters S31 to S42
measured in display channels CH 1 to CH 4 using
trace mathematics DATA/MEM as described
above.
PORT 1 and PORT 2 are used as usual as
bidirectional test ports, ie they are able to transmit
and receive. The new ports PORT 3 and PORT 4
provided by option ZVR-B26 are receiver ports
only; they cannot send. Consequently, with this
option too only some of the sixteen S-parameters
of a 4-port DUT can be measured. The
S-parameters for which ports 3 and 4 would be
required to send, ie Si3 and Si4 (i = 1,2,3,4) ,
cannot therefore be directly measured.
The measured S-parameters of the four-port DUT
can be assigned to the respective display channel
with the aid of TABLE 5:
Display channel:
Softkey designation in
MEAS menu:
In the scattering matrix below the S-parameters
that can be measured with the Extra Inputs option
ZVR-B26 are written in bold.
(S) =







S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44
Measured
S-parameter of
four-port DUT:







CH 1 CH 2 CH 3 CH 4
S11
S21
S12
S22
S31
S41
S32
S42
TABLE 5: Four-port measurement with ZVR-B26
The described operating steps can of course be
performed automatically with the aid of macros or
by means of an IEC/IEEE-bus program. If the
Computer Function option ZVR-B15 is built in, this
can be done conveniently on the network analyzer
itself without an additional computer being
required.
The first four parameters S 11 to S22 can be
measured as usual with all system error
correction methods being available. The
remaining four parameters S 31 to S42 are
measured in the special 4-port mode of the
analyzer. In this case a simple normalization is
performed using the trace mathematics. The
recommended procedure is illustrated using
channel CH 1 and the associated S-parameter
S31 as an example:
• Connect PORT 1 and PORT 3 directly.
• Press [MODE]: 4-PORT and [CH 1] as well as
[MEAS]: S11 to measure S31.
1EZ37_1E.DOC
11
29 May 1998
5
Summary
5.2
4-Port Adapter, Model 02
Twelve of the sixteen S-parameters of any fourport DUT can be measured when a bidirectional
Network Analyzer ZVRE or ZVR is used together
with model 02 of the 4-Port Adapter option
ZVR-B14.
(S) =
5.3







S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44







4-Port Adapter, Model 03
Model 03 of the 4-Port Adapter option ZVR-B14
is particularly suitable for measurements on fourport DUTs when the transmission coefficient from
one port to all other ports is to be measured.
(S) =
5.4







S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44







Extra Inputs, 4-Port
The Extra Inputs, 4-Port, option ZVR-B26 is the
third alternative for measurements on four-port
networks.
FIG. 5: 3-port adapter (top)
4-port adapter, model 02 (center)
4-port adapter, model 03 (bottom)
5.1
(S) =
Three-port DUTs can be measured using the
3-Port Adapter option ZVR-B8 and a Network
Analyzer ZVRL (unidirectional only), ZVRE or
ZVR. However, due to the construction of the
3-port adapter (SPDT at PORT 1), S-parameters
S13 and S31 cannot be measured.
(S) =
S11
S12
S13
S21
S22
S23
S31
S32
S33
1EZ37_1E.DOC
S11
S12
S13
S14
S21
S22
S23
S24
S31
S32
S33
S34
S41
S42
S43
S44







In contrast to the other options, no adapter is
connected in this case to test ports PORT 1 and
PORT 2 of the network analyzer but merely the
front panel is extended by two additional test
inputs PORT 3 and PORT 4.
3-Port Adapter

















Olaf Ostwald, 1ES3
Rohde & Schwarz
10 October 1997
12
29 May 1998
6
[1]
[2]
Further Application Notes
Order designation
H.-G. Krekels: Automatic Calibration of Vector
Network Analyzer ZVR, Appl. Note 1EZ30_1E.
Vector Network Analyzers (test sets included) *
O. Ostwald: 4-Port Measurements with Vector
Network Analyzer ZVR, Appl. Note 1EZ25_1E.
[4]
T. Bednorz: Measurement Uncertainties for
Vector Network Analysis, Appl. Note 1EZ29_1E.
[6]
[7]
[8]
[9]
Ordering Information
O. Ostwald: 3-Port Measurements with Vector
Network Analyzer ZVR, Appl. Note 1EZ26_1E.
[3]
[5]
7
3-channel, unidirectional,
50 Ω, passive
3-channel, bidirectional,
50 Ω, passive
3-channel, bidirectional,
50 Ω, active
4-channel, bidirectional,
50 Ω, passive
4-channel, bidirectional,
50 Ω, active
3-channel, bidirectional,
50 Ω, active
4-channel, bidirectional,
50 Ω, active
P. Kraus: Measurements on FrequencyConverting DUTs using Vector Network Analyzer
ZVR, Appl. Note 1EZ32_1E.
J. Ganzert: Accessing Measurement Data and
Controlling the Vector Network Analyzer via DDE,
Appl. Note 1EZ33_1E.
Type
Frequency
range
Order No.
ZVRL
9 kHz to 4 GHz
1043.0009.41
ZVRE
9 kHz to 4 GHz
1043.0009.51
ZVRE
300 kHz to 4 GHz
1043.0009.52
ZVR
9 kHz to 4 GHz
1043.0009.61
ZVR
300 kHz to 4 GHz
1043.0009.62
ZVCE
20 kHz to 8 GHz
1106.9020.50
ZVC
20 kHz to 8 GHz
1106.9020.60
Alternative Test Sets *
75 Ω SWR Bridge for ZVRL (instead of 50 Ω) 1)
J. Ganzert: File Transfer between Analyzers FSE
or ZVR and PC using MS-DOS Interlink, Appl.
Note 1EZ34_1E.
75 Ω, passive
ZVR-A71
9 kHz to 4 GHz
1043.7690.18
75 Ω SWR Bridge Pairs for ZVRE and ZVR (instead of 50 Ω) 1)
75 Ω, passive
75 Ω, active
O. Ostwald: Group and Phase Delay Measurements with Vector Network Analyzer ZVR,
Appl. Note 1EZ35_1E.
ZVR-A75
ZVR-A76
9 kHz to 4 GHz
300 kHz to 4 GHz
1043.7755.28
1043.7755.29
AutoKal
Time Domain
Mixer Measurements 2)
Reference Channel Ports
Power Calibration 3)
3-Port Adapter
Virtual Embedding
Networks 4)
4-Port Adapter (2xSPDT)
4-Port Adapter (SP3T)
ZVR-B1
ZVR-B2
ZVR-B4
ZVR-B6
ZVR-B7
ZVR-B8
ZVR-K9
0 to 8 GHz
same as analyzer
same as analyzer
same as analyzer
same as analyzer
0 to 4 GHz
same as analyzer
1044.0625.02
1044.1009.02
1044.1215.02
1044.1415.02
1044.1544.02
1086.0000.02
1106.8830.02
ZVR-B14
ZVR-B14
0 to 4 GHz
0 to 4 GHz
1106.7510.02
1106.7510.03
Controller (German) 5)
Controller (English) 5)
Ethernet BNC for ZVR-B15
Ethernet AUI for ZVR-B15
IEC/IEEE-Bus Interface for
ZVR-B15
ZVR-B15
ZVR-B15
FSE-B16
FSE-B16
FSE-B17
-
1044.0290.02
1044.0290.03
1073.5973.02
1073.5973.03
1066.4017.02
Generator Step Attenuator
PORT 1
Generator Step Attenuator
PORT 2 6)
Receiver Step Attenuator
PORT 1
Receiver Step Attenuator
PORT 2
External Measurements,
7)
50 Ω
ZVR-B21
same as analyzer
1044.0025.11
ZVR-B22
same as analyzer
1044.0025.21
ZVR-B23
same as analyzer
1044.0025.12
ZVR-B24
same as analyzer
1044.0025.22
ZVR-B25
10 Hz to 4 GHz
(ZVR/E/L)
20 kHz to 8 GHz
(ZVC/E)
1044.0460.02
Options
O. Ostwald: Multiport Measurements using
Vector Network Analyzer, Appl. Note 1EZ37_1E.
[10] O. Ostwald: Frequently Asked Questions about
Vector Network Analyzer ZVR, Appl. Note
1EZ38_3E.
[11] A. Gleißner: Internal Data Transfer between
Windows 3.1 / Excel and Vector Network
Analyzer ZVR, Appl. Note 1EZ39_1E.
[12] A. Gleißner: Power Calibration of Vector Network
Analyzer ZVR, Appl. Note 1EZ41_2E
[13] O. Ostwald: Pulsed Measurements on GSM
Amplifier SMD ICs with Vector Analyzer ZVR,
Appl. Note 1EZ42_1E.
[14] O. Ostwald: Zeitbereichsmessungen mit dem
Netzwerkanalysator ZVR, Appl. Note 1EZ44_1D.
1)
To be ordered together with the analyzer.
Harmonics measurements included.
Power meter and sensor required.
4)
Only for ZVR or ZVC with ZVR-B15.
5)
DOS, Windows 3.11, keyboard and mouse included.
6)
For ZVR or ZVC only.
7)
Step attenuators required.
2)
3)
* Note:
Active test sets, in contrast to passive test sets, comprise internal bias ne tworks,
eg to supply DUTs.
1EZ37_1E.DOC
13
29 May 1998
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement