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Model X3C19P2-30S
Rev B
30 dB Directional Coupler
Description
The X3C19P2-30S is a low profile, high performance 30dB directional
coupler in a new easy to use, manufacturing friendly surface mount
package. It is designed for DCS, PCS, WCDMA and LTE band
applications. The X3C19P2-30S is designed particularly for power and
frequency detection, as well as for VSWR monitoring, where tightly
controlled coupling and low insertion loss is required. It can be used in
high power applications up to 200 Watts.
Parts have been subjected to rigorous qualification testing and they are
manufactured using materials with coefficients of thermal expansion
(CTE) compatible with common substrates such as FR4, G-10, RF-35,
RO4003 and polyimide. Produced with 6 of 6 RoHS compliant tin
immersion finish
Electrical Specifications **
Frequency Mean
Coupling Insertion
Loss VSWR Directivity
MHz dB dB Max Max : 1 dB Min
1400 – 2700 30.4 ± 1.50 0.10 1.22 20
1805 – 1880 30.0 ± 1.50 0.075 1.12 20
1930 - 1990 30.0 ± 1.50 0.075 1.12 20
2110 - 2170 30.2 ± 1.50 0.10 1.12 20
Frequency
Sensitivity Power JC Operating
Temp.
dB Max Avg. CW
Watts ºC/Watt ºC
± 2.0 200 43 -55 to +95
± 0.05 200 43 -55 to +95
± 0.05 200 43 -55 to +95
Features:
1400 - 2700 MHz
DCS, PCS, WCDMA and LTE
High Power
Very Low Loss
Tight Coupling
High Directivity
Production Friendly
Tape and Reel
Lead Free
± 0.30 200 43 -55 to +95
**Specification based on performance of unit properly installed on Anaren Test Board 61015-0001. Refer to
Specifications subject to change without notice. Refer to parameter definitions for details.
Mechanical Outline
.250±.010
[6.35±0.25]
.200±.010
[5.08±0.25]
.120±.004
[3.05±0.10]
.170±.004
[4.32±0.10]
4X .034±.004 SQ
[0.86±0.10]
4X .020±.004
[0.51±0.10]
4X .020±.004
[0.51±0.10]
.082±.016
[2.08±0.42]GND
PIN 1 PIN 2
PIN 3PIN 4
ORIENTATION MARK
DENOTES PIN 1
DENOTES
ARRAY NUMBER
GND
PIN 2 PIN 1
PIN 4
PIN 3
Dimensions are in Inches [Millimeters]
X3C19P2-30S Mechanical Outline Tolerances are Non-Cumulative
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Directional Coupler Pin Configuration
The X3C19P2-30S has an orientation marker to denote Pin 1. Once port one has been identified the other ports are
known automatically. Please see the chart below for clarification:
30dB Coupler Pin Configuration
Pin 1 Pin 2 Pin 3 Pin 4
Input Direct Isolated Coupled
Direct Input Coupled Isolated
Note: The direct port has a DC connection to the input port and the coupled port has a DC connection to the
isolated port.
For optimum IL and power handling performance, use Pin 1 or Pin 2 as inputs.
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Insertion Loss and Power Derating Curv es
Typical Insertion Loss Derating Curve for X3C19P2-30
-0.07
-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0
-100 -50 0 50 100 150 200
Temperature of the Part (
o
C)
Insertion Loss (dB)
typical insertion loss (f=1880Mhz)
typical insertion loss (f=1990Mhz)
typical insertion loss (f=2170Mhz)
typical insertion loss (f=2600Mhz)
X3C19P2-30 Power Derating Curve
0
50
100
150
200
250
300
350
400
0 50 100 150 200
Mounting Interface Temperature (
o
C)
Power (Watts)
1400 - 2700Mhz
95
Insertion Loss Derating:
The insertion loss, at a given frequency, of a group of
couplers is measured at 25C and then averaged. The
measurements are performed under small signal
conditions (i.e. using a Vector Network Analyzer). The
process is repeated at 85C and 150C. A best-fit line for
the measured data is computed and then plotted from -
55C to 150C.
Power Derating:
The power handling and corresponding power derating
plots are a function of the thermal resistance, mounting
surface temperature (base plate temperature), maximum
continuous operating temperature of the coupler, and the
thermal insertion loss. The thermal insertion loss is
defined in the Power Handling section of the data sheet.
As the mounting interface temperature approaches the
maximum continuous operating temperature, the power
handling decreases to zero.
If mounting temperature is greater than 95C, Xinger
coupler will perform reliably as long as the input power is
derated to the curve above.
Model X3C19P2-30S
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Typical Performance (-55°C, 25°C, 95 °C & 125°C): 1400-2700 MHz
1400 1600 1800 2000 2200 2400 2600 2800
-70
-60
-50
-40
-30
-20
-10
0
Return Loss for X3C19P2-30S(Feeding port1)
Freq (MHz)
Return Loss (dB)
-55C
25C
95C
125C
1400 1600 1800 2000 2200 2400 2600 2800
-70
-60
-50
-40
-30
-20
-10
0
Return Loss for X3C19P2-30S(Feeding port2)
Freq (MHz)
Return Loss (dB)
-55C
25C
95C
125C
1400 1600 1800 2000 2200 2400 2600 2800
-70
-60
-50
-40
-30
-20
-10
0
Return Loss for X3C19P2-30S(Feeding port3)
Freq (MHz)
Return Loss (dB)
-55C
25C
95C
125C
1400 1600 1800 2000 2200 2400 2600 2800
-70
-60
-50
-40
-30
-20
-10
0
Return Loss for X3C19P2-30S(Feeding port4)
Freq(MHz)
Return Loss (dB)
-55C
25C
95C
125C
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Typical Performance (-55°C, 25°C, 95 °C & 125°C): 1400-2700 MHz
1400 1600 1800 2000 2200 2400 2600 2800
-32
-31.5
-31
-30.5
-30
-29.5
-29
-28.5
-28
Coupling for X3C19P2-30S(Feeding port1)
Freq (MHz)
Coupling [dB]
-55C
25C
95C
125C
1400 1600 1800 2000 2200 2400 2600 2800
-60
-50
-40
-30
-20
-10
0
Directivity for X3C19P2-30S(Feeding port1)
Freq (MHz)
Directivity (dB)
-55C
25C
95C
125C
1400 1600 1800 2000 2200 2400 2600 2800
-0.2
-0.18
-0.16
-0.14
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
Insertion Loss for X3C19P2-30S(Feeding port1)
Freq (MHz)
Insertion Loss (dB)
-55C
25C
95C
125C
1400 1600 1800 2000 2200 2400 2600 2800
-0.2
-0.18
-0.16
-0.14
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
Transmission Loss for X3C19P2-30S(Feeding port1)
Freq (MHz)
Transmission Loss (dB)
-55C
25C
95C
125C
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Definition of Measured Specifica tions
Parameter Definition Mathematical Representation
VSWR
(Voltage Standing Wave Ratio )
The impedance match of
the coupler to a 50
system. A VSWR of 1:1 is
optimal.
VSWR = min
max
V
V
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
Return Loss
The impedance match of
the coupler to a 50
system. Return Loss is
an alternate means to
express VSWR.
Return Loss (dB)= 20log 1-VSW
R
1VSWR
Mean Coupling
At a given frequency (n),
coupling is the input
power divided by the
power at the coupled
port. Mean coupling is
the average value of the
coupling values in the
band. N is the number of
frequencies in the band.
Coupling (dB) =
)( )(
log10)(
ncpl
nin
nP
P
C
Mean Coupling (dB) =
N
C
N
nn
1)(
Insertion Loss The input power divided
by the sum of the power
at the two output ports.
10log direct cpl
in
PP P
Transmission Loss The input power divided
by the power at the direct
port.
10log direct
in
P
P
Directivity
The power at the
coupled port divided by
the power at the isolated
port.
10log iso
cpl
P
P
Frequency Sensitiv ity
The decibel difference
between the maximum in
band coupling value and
the mean coupling, and
the decibel difference
between the minimum in
band coupling value and
the mean coupling.
Max Coupling (dB) – Mean Coupling (dB)
and
Min Coupling (dB) – Mean Coupling (dB)
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Notes on RF Testing and Circuit Layout
The X3C19P2-30S Surface Mount Couplers require the use of a test fixture for verification of RF performance. This
test fixture is designed to evaluate the coupler in the same environment that is recommended for installation.
Enclosed inside the test fixture, is a circuit board that is fabricated using the recommended footprint. The part being
tested is placed into the test fixture and pressure is applied to the top of the device using a pneumatic piston. A four
port Vector Network Analyzer is connected to the fixture and is used to measure the S-parameters of the part. Worst
case values for each parameter are found and compared to the specification. These worst case values are reported to
the test equipment operator along with a Pass or Fail flag. See the illustrations below.
Test Board
In Fixture
30 dB
Test Board
Test Station
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The effects of the test fixture on the measured data must be minimized in order to accurately determine the
performance of the device under test. If the line impedance is anything other than 50 and/or there is a
discontinuity at the microstrip to SMA interface, there will be errors in the data for the device under test. The
test environment can never be “perfect”, but the procedure used to build and evaluate the test boards
(outlined below) demonstrates an attempt to minimize the errors associated with testing these devices. The
lower the signal level that is being measured, the more impact the fixture errors will have on the data.
Parameters such as Return Loss and Isolation/Directivity, which are specified as low as 27dB and typically
measure at much lower levels, will present the greatest measurement challenge.
The test fixture errors introduce an uncertainty to the measured data. Fixture errors can make the performance of the
device under test look better or worse than it actually is. For example, if a device has a known return loss of 30dB and
a discontinuity with a magnitude of –35dB is introduced into the measurement path, the new measured Return Loss
data could read anywhere between –26dB and –37dB. This same discontinuity could introduce an insertion phase
error of up to 1.
There are different techniques used throughout the industry to minimize the affects of the test fixture on the
measurement data. Anaren uses the following design and de-embedding criteria:
Test boards have been designed and parameters specified to provide trace impedances of 50
1. Furthermore, discontinuities at the SMA to microstrip interface are required to be less than
–35dB and insertion phase errors (due to differences in the connector interface discontinuities
and the electrical line length) should be less than 0.25 from the median value of the four
paths.
A “Thru” circuit board is built. This is a two port, microstrip board that uses the same SMA to
microstrip interface and has the same total length (insertion phase) as the actual test board. The
“Thru” board must meet the same stringent requirements as the test board. The insertion loss
and insertion phase of the “Thru” board are measured and stored. This data is used to
completely de-embed the device under test from the test fixture. The de-embedded data is
available in S-parameter form on the Anaren website (www.anaren.com).
Note: The S-parameter files that are available on the anaren.com website include data for frequencies that are
outside of the specified band. It is important to note that the test fixture is designed for optimum performance through
2.3GHz. Some degradation in the test fixture performance will occur above this frequency and connector interface
discontinuities of –25dB or more can be expected. This larger discontinuity will affect the data at frequencies above
2.3GHz.
Circuit Board Layout
The dimensions for the Anaren test board are shown below. The test board is printed on Rogers RO4350 material
that is 0.030” thick. Consider the case when a different material is used. First, the pad size must remain the same to
accommodate the part. But, if the material thickness or dielectric constant (or both) changes, the reactance at the
interface to the coupler will also change. Second, the linewidth required for 50 will be different and this will introduce
a step in the line at the pad where the coupler interfaces with the printed microstrip trace. Both of these conditions will
affect the performance of the part. To achieve the specified performance, serious attention must be given to the
design and layout of the circuit environment in which this component will be used.
If a different circuit board material is used, an attempt should be made to achieve the same interface pad reactance
that is present on the Anaren RO4350 test board. When thinner circuit board material is used, the ground plane will
be closer to the pad yielding more capacitance for the same size interface pad. The same is true if the dielectric
constant of the circuit board material is higher than is used on the Anaren test board. In both of these cases,
narrowing the line before the interface pad will introduce a series inductance, which, when properly tuned, will
compensate for the extra capacitive reactance. If a thicker circuit board or one with a lower dielectric constant is used,
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the interface pad will have less capacitive reactance than the Anaren test board. In this case, a wider section of line
before the interface pad (or a larger interface pad) will introduce a shunt capacitance and when properly tuned will
match the performance of the Anaren test board.
Notice that the board layout for the 3dB and 5dB couplers is different from that of the 10dB and 20dB couplers. The
test board for the 3dB and 5dB couplers has all four traces interfacing with the coupler at the same angle. The test
board for the 30dB, 10dB and 20dB couplers has two traces approaching at one angle and the other two traces at a
different angle. The entry angle of the traces has a significant impact on the RF performance and these parts
have been optimized for the lay out used on the test boards shown below.
30dB Test Board
Testing Sample Parts Supplied on Anaren Tes t Bo ards
If you have received a coupler installed on an Anaren produced microstrip test board, please remember to remove the
loss of the test board from the measured data. The loss is small enough that it is not of concern for Return Loss and
Isolation/Directivity, but it should certainly be considered when measuring coupling and calculating the insertion loss
of the coupler. An S-parameter file for a “Thru” board (see description of “Thru” board above) will be supplied upon
request. As a first order approximation, one should consider the following loss estimates:
Frequency Band Avg. Ins. Loss of Test Board @ 25C
410 – 500 MHz ~ 0.04dB
800 - 1000 MHz ~ 0.06dB
1700 – 2300 MHz ~0.14dB
2300 – 2700 MHz ~0.155dB
3300 – 3800 MHz ~0.20dB
For example, a 1900MHz, 10dB coupler on a test board may measure –10.30dB from input to the coupled port at
some frequency, F1. When the loss of the test board is removed, the coupling at F1 becomes -10.18dB (-10.30dB +
0.12dB). This compensation must be made to both the coupled and direct path measurements when calculating
insertion loss.
The loss estimates in the table above come from room temperature measurements. It is important to note that the
loss of the test board will change with temperature. This fact must be considered if the coupler is to be evaluated at
other temperatures.
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Peak Power Handling
High-Pot testing of these couplers during the qualification procedure resulted in a minimum breakdown voltage of 1.40
kV. This voltage level corresponds to a breakdown resistance capable of handling at least 12dB peaks over average
power levels, for very short durations. The breakdown location consistently occurred across the air interface at the
coupler contact pads (see illustration below). The breakdown levels at these points will be affected by any
contamination in the gap area around these pads. These areas must be kept clean for optimum performance. It is
recommended that the user test for voltage breakdown under the maximum operating conditions and over worst case
modulation induced power peaking. This evaluation should also include extreme environmental conditions (such as
high humidity).
Orientation Marker
A printed circular feature appears on the top surface of the coupler to designate Pin 1. This orientation marker is not
intended to limit the use of the symmetry that these couplers exhibit but rather to facilitate consistent placement of
these parts into the tape and reel package. This ensures that the components are always delivered with the same
orientation. Refer to the table on page 2 of the data sheet for allowable pin configurations.
Test Plan
Xinger III 30dB couplers are manufactured in large panels and then separated. A sample population of parts is RF
small signal tested at room temperature in the fixture described above. All parts are DC tested for shorts/opens. (See
“Qualification Flow Chart” section for details on the accelerated life test procedures.)
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Power Handling
The average power handling (total input power) of a Xinger coupler is a function of:
Internal circuit temperature.
Unit mounting interface temperature.
Unit thermal resistance
Power dissipated within the unit.
All thermal calculations are based on the following assumptions:
The unit has reached a steady state operating condition.
Maximum mounting interface temperature is 95oC.
Conduction Heat Transfer through the mounting interface.
No Convection Heat Transfer.
No Radiation Heat Transfer.
The material properties are constant over the operating temperature range.
Finite element simulations are made for each unit. The simulation results are used to calculate the unit thermal
resistance. The finite element simulation requires the following inputs:
Unit material stack-up.
Material properties.
Circuit geometry.
Mounting interface temperature.
Thermal load (dissipated power).
The classical definition for dissipated power is temperature delta (T) divided by thermal resistance (R). The
dissipated power (Pdis) can also be calculated as a function of the total input power (Pin) and the thermal insertion loss
(ILtherm):
)(101 10 WP
R
T
Ptherm
IL
indis
(1)
Power flow and nomenclature for an “H” style coupler is shown in Figure 1.
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Pin 1
Pin 4
Input Port
Coupled Port Isolated Port
Direct Port
PIn POut(RL) POut(DC)
POut(CPL) POut(ISO)
Figure 1
The coupler is excited at the input port with Pin (watts) of power. Assuming the coupler is not ideal, and that there are
no radiation losses, power will exit the coupler at all four ports. Symbolically written, Pout(RL) is the power that is
returned to the source because of impedance mismatch, Pout(ISO) is the power at the isolated port, Pout(CPL) is the
power at the coupled port, and Pout(DC) is the power at the direct port.
At Anaren, insertion loss is defined as the log of the input power divided by the sum of the power at the coupled and
direct ports:
Note: in this document, insertion loss is taken to be a positive number. In many places, insertion loss is written as a
negative number. Obviously, a mere sign change equates the two quantities.
)dB(
PP P
log10IL
)DC(out)CPL(out
in
10
(2)
In terms of S-parameters, IL can be computed as follows:
)dB(SSlog10IL 2
41
2
3110
(3)
We notice that this insertion loss value includes the power lost because of return loss as well as power lost to the
isolated port.
For thermal calculations, we are only interested in the power lost “inside” the coupler. Since Pout(RL) is lost in the
source termination and Pout(ISO) is lost in an external termination, they are not be included in the insertion loss for
thermal calculations. Therefore, we define a new insertion loss value solely to be used for thermal calculations:
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)(log10
)()()()(
10 dB
PPPP P
IL
RLoutISOoutDCoutCPLout
in
therm
(4)
In terms of S-parameters, ILtherm can be computed as follows:
)(log10 2
41
2
31
2
21
2
1110 dBSSSSILtherm
(5)
The thermal resistance and power dissipated within the unit are then used to calculate the average total input power
of the unit. The average total steady state input power (Pin) therefore is:
)(
101101 1010
W
R
T
P
Pthermtherm ILIL
dis
in
(6)
Where the temperature delta is the circuit temperature (Tcirc) minus the mounting interface temperature (Tmnt):
)( CTTT o
mntcirc (7)
The maximum allowable circuit temperature is defined by the properties of the materials used to construct the unit.
Multiple material combinations and bonding techniques are used within the Xinger III product family to optimize RF
performance. Consequently the maximum allowable circuit temperature varies. Please note that the circuit
temperature is not a function of the Xinger case (top surface) temperature. Therefore, the case temperature cannot
be used as a boundary condition for power handling calculations.
Due to the numerous board materials and mounting configurations used in specific customer configurations, it is the
end users responsibility to ensure that the Xinger III coupler mounting interface temperature is maintained within the
limits defined on the power derating plots for the required average power handling. Additionally appropriate solder
composition is required to prevent reflow or fatigue failure at the RF ports. Finally, reliability is improved when the
mounting interface and RF port temperatures are kept to a minimum.
The power-derating curve illustrates how changes in the mounting interface temperature result in converse changes
of the power handling of the coupler.
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Mounting
In order for Xinger surface mount couplers to work
optimally, there must be 50Ω transmission lines leading
to and from all of the RF ports. Also, there must be a
very good ground plane underneath the part to ensure
proper electrical performance. If either of these two
conditions is not satisfied, insertion loss, coupling, VSWR
and isolation may not meet published specifications.
Overall ground is improved if a dense population of
plated through holes connect the top and bottom ground
layers of the PCB. This minimizes ground inductance
and improves ground continuity. All of the Xinger hybrid
and directional couplers are constructed from ceramic
filled PTFE composites which possess excellent electrical
and mechanical stability having X and Y thermal
coefficient of expansion (CTE) of 17-25 ppm/oC.
When a surface mount hybrid coupler is mounted to a
printed circuit board, the primary concerns are; ensuring
the RF pads of the device are in contact with the circuit
trace of the PCB and insuring the ground plane of neither
the component nor the PCB is in contact with the RF
signal.
Mounting Footprint
Coupler Mounting Process
The process for assembling this component is a
conventional surface mount process as shown in Figure
1. This process is conducive to both low and high volume
usage.
Figure 1: Surface Mounting Process Steps
Storage of Components: The Xinger III products are
available in either an immersion tin or tin-lead finish.
Commonly used storage procedures used to control
oxidation should be followed for these surface mount
components. The storage temperatures should be held
between 15OC and 60OC.
Substrate: Depending upon the particular component,
the circuit material has an x and y coefficient of thermal
expansion of between 17 and 25 ppm/°C. This coefficient
minimizes solder joint stresses due to similar expansion
rates of most commonly used board substrates such as
RF35, RO4350, FR4, polyimide and G-10 materials.
Mounting to “hard” substrates (alumina etc.) is possible
depending upon operational temperature requirements.
The solder surfaces of the coupler are all copper plated
with either an immersion tin or tin-lead exterior finish.
Solder Paste: All conventional solder paste formulations
will work well with Anaren’s Xinger III surface mount
components. Solder paste can be applied with stencils or
syringe dispensers. An example of a stenciled solder
paste deposit is shown in Figure 2. As shown in the
figure solder paste is applied to the four RF pads and the
entire ground plane underneath the body of the part.
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Figure 2: Solder Paste Application
Coupler Positioning: The surface mount coupler can
be placed manually or with automatic pick and place
mechanisms. Couplers should be placed (see Figure 3
and 4) onto wet paste with common surface mount
techniques and parameters. Pick and place systems
must supply adequate vacuum to hold a 0.199 gram
coupler.
Figure 3: Component Placement
Figure 4: Mounting Features Example
Reflow: The surface mount coupler is conducive to most of
today’s conventional reflow methods. A low and high
temperature thermal reflow profile are shown in Figures 5
and 6, respectively. Manual soldering of these components
can be done with conventional surface mount non-contact
hot air soldering tools. Board pre-heating is highly
recommended for these selective hot air soldering
methods. Manual soldering with conventional irons should
be avoided.
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Manufacturing.
Figure 5 – Low Temperature Solder Reflow Thermal Profile
Figure 6 – High Temperatu re So lder Reflow Thermal Profile
Available on Tape
and Reel for Pick and
Place Manufacturing.
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Model X3C19P2-30S
Rev B
Qualification Flow Chart
Xinger III Product
Qualification
Visual Inspection
n=55
Solderability Test
n=
5
Mechanical Inspectio
n
n=50
Initial RF Test
n=50
Visual Inspection
n
=
50
V- TEK Testing
n=45
Visual Inspection
n=50
Post V-TEK Test RF Test
n=50
Visual Inspection
n=
50
Solder Units to Test
Board
n=25
Post Solder Visual
Inspection
n=25
Visual Inspection
n=25
RF Test at -55°C, 25°C,
95°C
n=20
Initial RF Test Board
Mounted
n=25
Visual Inspection
n=25
Post Resistance Heat RF
Test
n=20
Mechanical Inspection
n=20
Voltage Br eakdown T est MIL
202F, Method 301 25°C 5KV
n=40
Visual Inspection
n=
50
Control Units RF Test
25°C only
n=5
Loose Control Units
n=
5
Resistance to Solder MIL 202G
Method 210F, Condition K Heat
n=20
Loose Control Units
n=5
Control Units
n=
5
Loose Control Units
n=
5
Model X3C19P2-30S
Rev B
USA/Canada:
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Europe:
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Available on Tape and
Reel for Pick and Place
Manufacturing.
Control U nits
n
=
10
Post Voltage RF Test
n=50
Therm al Cycle100 cycles -55° to
125°C. Dwell time= 30 min
n=40
Visual Inspection
n=50
Control Units
n=10
Visual Inspection
n=50
Bake Units for 1 hour at
100° to 120°C
n=40
125% Power
Life Test 72 hrs
n= 3
Post Bake RF Test
n=50
Visual Inspection
n=30
Microsection
3 test units 1 control
Final RF Test @ 25°C
n=2
5
Microsection
2 Life, 1 high power and
1 control
Post Mois tu re Resistan c e
RF Test
n=50
Post Thermal RF Test
n=50
Mo is ture Resi sta nc e Te sti ng -2 5° to 65° C fo r 2
hrs @ 90% humidity. Soak for 168 hrs at 90% to
85% humidity. Ramp temp to 25°C in 2 hrs @
90% humidity. Then soak @ -10°C for 3 hrs.
n=40
Post Mois tu re Resistan c e
RF Test n=50
Control Units
n
=
10
Available on Tape
and Reel for Pick and
Place Manufacturing.
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Toll Free:
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(800) 411-6596
+44 2392-232392
Model X3C19P2-30S
Rev B
Application Information
Directional Couplers and Sampling
Directional couplers are often used in circuits that require the sampling of an arbitrary signal. Because they are
passive, non-linear devices, Anaren directional couplers do not perturb the characteristics of the signal to be sampled,
and can be used for frequency monitoring and/or measurement of RF power. An example of a sampling circuit is the
reflectometer. The purpose of the reflectometer is to isolate and sample the incident and reflected signals from a
mismatched load. A basic reflectometer circuit is shown in Figure ap.n.1-1.
LOAD
12
34
Reflected
Wave
Vinput
I
VV
R
Figure ap.n.1-1. A Reflectometer Circuit Schematic
If the directional coupler has perfect directivity, then it is clear that VI is strictly a sample of the incident voltage Vinput,
and VR is strictly a sample of the wave that is reflected from the load. Since directivity is never perfect in practice, both
VI and VR will contain samples of the input signal as well as the reflected signal. In that case,
j
IeV CDTC Eq. ap.n.1-1
and
j
ReV CTCD Eq. ap.n.1-2
where C is the coupling, D is the directivity, is the complex reflection coefficient of the load, T is the transmission
coefficient, and and are unknown phase delay differences caused by the interconnect lines on the test board. If we
know VI and VR, we can easily calculate the reflection coefficient of the load. One should notice that in order to make
forward and reverse measurements using only one coupler, the directivity must be really low. In specific customer
applications, the preferred method for forward and reverse sampling is shown in Figure ap.n.1-2.
Model X3C19P2-30S
Rev B
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LOAD
12
34
Reflected
Wave
INPUT
ISOLATOR
REVERSE
MEASUREMENT
MEASUREMENT
FORWARD
**TERMINATION
*Recommended Terminations
Power (Watts) Model
8 RFP- 060120A15Z50-2
10 RFP- C10A50Z4
16 RFP- C16A50Z4
20 RFP- C20N50Z4
50 RFP- C50A50Z4
100 RFP- C100N50Z4
200 RFP- C200N50Z4
Figure ap.n.1-2. Forward and Reverse Sampling
The isolator in Figure ap.n.1-2 prevents the reflected wave from exciting the directional coupler. A list of recommended
terminations is shown in the figure.
Directional Couplers in Feed-Forward Amplifier Applications
Feed-forward amplifiers are widely used to reduce distortion due to nonlinearities in power amplifiers. Although the
level and complexity of feed-forward amplifiers varies from one manufacturer to another, the basic building block for this
linearization scheme remains the same. A basic feed-forward schematic is shown in Figure ap.n.2-1. The input signal
is split in two using a hybrid coupler or power divider. The output of the main amplifier is sampled with a 20dB-30dB
directional coupler. The X3C19P2-30S is an excellent candidate for this sampling since it provides great return loss and
directivity. The sampled signal, which consists of a sample of the original input signal plus some distortion, is inverted
and then combined with the output of the first delay line. This procedure subtracts (through destructive interference) the
sample of the original input signal, leaving only the distortion or error component. The error component is then
amplified and combined with the output of the second delay line using another directional coupler. In many cases, a
10dB coupler is used to combine the two signals. The XC0900E-10 is a perfect choice for this injection because it has
tight coupling, superior directivity, and excellent match.
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and Reel for Pick and
Place Manufacturing.
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Toll Free:
Europe:
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Model X3C19P2-30S
Rev B
*Recommended Terminations
Power (Watts) Model
8 RFP- 060120A15Z50-2
10 RFP- C10A50Z4
16 RFP- C16A50Z4
20 RFP- C20N50Z4
50 RFP- C50A50Z4
100 RFP- C100N50Z4
200 RFP- C200N50Z4
Figure ap.n.2-1. Generic Feed Forward Circuit Schematic
Both directional couplers in the Figure ap.n.2-1 have one port terminated with a 50 resistor. In order to achieve
optimum performance, the termination must be chosen carefully. It is important to remember that a good termination
will not only produce a good match at the input of the coupler, but will also maximize the isolation between the input port
and isolated port. Furthermore, since the termination can potentially absorb high levels of power, its maximum power
rating should be chosen accordingly. A list of recommended terminations is shown in Figure ap.n.2-1. For an ideal
lossless directional coupler, the power at the coupled and direct ports can be written as:
Watts
dB
10
)(Coupling
input
coupled
10
P
PEq. ap.n.2-1
Watts
dB
10
)(Coupling
input
inputdirect 10
P
PP Eq. ap.n.2-2
where Pinput is the input power in Watts, and Coupling(dB) is the coupling value in dB.
USA/Canada:
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Europe:
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Available on Tape and
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Manufacturing.
Model X3C19P2-30S
Rev B
Packaging and Ordering Information
Parts are available in a reel and as loose parts in a bag. Packaging follows EIA 481-2 for reels. Parts are oriented in
tape and reel as shown below. Minimum order quantities are 2000 per reel and 100 for loose parts. See Model
Numbers below for further ordering information.
Direction of Part
Feed (Unloading)
Dimensions are in Inches[MM]
Xinger Coupler Frequency (MHz) Size (Inches) Coupling Value Plating Finish
X3C
04 = 410-500
07 = 600-900
09 = 800-1000
19 = 1700-2000
21 = 2000-2300
25 = 2300-2500
26 = 2650-2800
35 = 3300-3800
A = 0.56 x 0.35
B = 1.0 x 0.50
E = 0.56 x 0.20
L = 0.65 x 0.48
M= 0.40 x 0.20
P = 0.25 x 0.20
1 = 100
2 = 200
3 = 300
P = Tin Lead
S = Immersion Tin
XXX XX X X - XX X
03 = 3dB
05 = 5dB
10 = 10dB
20 = 20dB
30 = 30dB
Power (Watts)
Example: X3C 19 P 1 - 03 S
