X3C26P1-30S
Rev D
30 dB Directional Coupler
Description:
The X3C26P1-30S is a low profile, high performance 30dB directional
coupler in a new easy to use, manufacturing friendly surface mount
package. It is designed for WIMAX and LTE band applications. The
X3C26P1-30S 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.
Detailed Electrical Specifications:
Features:
• 2300 - 2900 MHz
• WIMAX and LTE
• High Power
• Very Low Loss
• Tight Coupling
• High Directivity
• Production Friendly
• Tape and Reel
• Lead Free
Frequency
MHz
2300 – 2900
2500 – 2700
Directivity
Mean
Coupling
Insertion
Loss
30.0 ± 1.00
30.0 ± 0.80
Frequency
Sensitivity
0.10
0.05
dB
dB Min
dB Max
20
± 0.25
22
± 0.10
dB Max
Power
Avg. CW Watts
@95oC
VSWR
Max : 1
1.15
1.12
Operating
Temp.
ºC
200
-55 to +150
200
-55 to +150
**Specification based on performance of unit properly installed on TTM Technologies Test Board 61015-0001.
*Specifications subject to change without notice. Refer to parameter definitions for details.
Outline Drawing:
1
X3C26P1-30S
Rev D
Directional Coupler Pin Configuration
The X3C26P1-30S 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:
Pin 1
Input
Direct
Pin 2
Direct
Input
Pin 3
Isolated
Coupled
Pin 4
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.
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).
2
X3C26P1-30S
Rev D
Insertion Loss and Power Derating Curves
Typical Insertion Loss Derating Curve for X3C26P1-30
X3C26P1-30 Power Derating Curve
0
400
typical insertion loss (f=2700Mhz)
typical insertion loss (f=2900Mhz)
-0.005
350
2300 - 2900Mhz
300
Power (Watts)
Insertion Loss (dB)
-0.01
-0.015
250
200
150
-0.02
100
-0.025
-0.03
-100
50
0
-50
0
50
100
150
200
o
Temperature of the Part ( C)
0
50
95
100
150
200
o
Mounting Interface Temperature ( C)
Insertion Loss Derating:
Power Derating:
The insertion loss, at a given frequency, of a group
of couplers is measured at 25°C and then averaged.
The measurements are performed under small
signal conditions (i.e. using a Vector Network
Analyzer). The process is repeated at 85°C and
150°C. A best-fit line for the measured data is
computed and then plotted from -55°C to 150°C.
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.
3
X3C26P1-30S
Rev D
Typical Performance (-55°C, 25°C and 95°C): 2300-2900 MHz
Return Loss for X3C26P1-30S(Feeding port1)
0
0
25ºC
-55ºC
95ºC
-10
Return Loss (dB)
Return Loss (dB)
-20
-30
-40
-40
-50
-60
-60
2400
2500
2600
2700
Frequency (Mhz)
2800
-70
2300
2900
Return Loss for X3C26P1-30S(Feeding port3)
0
25ºC
-55ºC
95ºC
-10
2500
2700
2600
Frequency (Mhz)
2800
2900
Return Loss for X3C26P1-30S(Feeding port4)
25ºC
-55ºC
95ºC
-20
Return Loss (dB)
-30
-40
-30
-40
-50
-50
-60
-60
-70
2300
2400
-10
-20
Return Loss (dB)
-30
-50
0
25ºC
-55ºC
95ºC
-10
-20
-70
2300
Return Loss for X3C26P1-30S(Feeding port2)
2400
2500
2600
2700
Frequency (Mhz)
2800
2900
-70
2300
2400
2500
2700
2600
Frequency (Mhz)
2800
2900
4
X3C26P1-30S
Rev D
Typical Performance (-55°C, 25°C and 95°C): 2300-2900MHz
Coupling for X3C26P1-30S(Feeding port1)
-29
25ºC
-55ºC
95ºC
-29.2
25ºC
-55ºC
95ºC
-10
-29.4
-29.6
-20
Directivity (dB)
-29.8
Coupling (dB)
Directivity for X3C26P1-30S(Feeding port1)
0
-30
-30.2
-30
-40
-30.4
-30.6
-50
-30.8
-31
2300
0
2400
2500
2600
2700
Frequency (Mhz)
2800
Insertion Loss for X3C26P1-30S(Feeding port1)
0
25ºC
-55ºC
95ºC
-0.02
-0.04
-0.04
-0.06
-0.06
-0.08
-0.1
-0.12
-0.16
-0.18
-0.18
2700
2600
Frequency (Mhz)
2800
2900
2800
2900
Transmission Loss for X3C26P1-30S(Feeding port1)
25ºC
-55ºC
95ºC
-0.12
-0.16
2500
2600
2700
Frequency (Mhz)
-0.1
-0.14
2400
2500
-0.08
-0.14
-0.2
2300
2400
-0.02
Transmission Loss (dB)
Insertion Loss (dB)
-60
2300
2900
-0.2
2300
2400
2500
2600
2700
Frequency (Mhz)
2800
2900
5
X3C26P1-30S
Rev D
Definition of Measured Specifications
Parameter
VSWR
(Voltage Standing Wave Ratio)
Return Loss
Mean Coupling
Insertion Loss
Definition
The impedance match of
the coupler to a 50Ω
system. A VSWR of 1:1 is
optimal.
The impedance match of
the coupler to a 50Ω
system. Return Loss is an
alternate means to express
VSWR.
At a given frequency (ωn),
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.
The input power divided by
the sum of the power at the
two output ports.
Transmission Loss
The input power divided by
the power at the direct port.
Directivity
The power at the coupled
port divided by the power at
the isolated port.
Frequency Sensitivity
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.
Mathematical Representation
𝑉𝑉𝑚𝑚𝑚𝑚𝑚𝑚
𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉 =
𝑉𝑉𝑚𝑚𝑚𝑚𝑚𝑚
Vmax = voltage maxima of a standing wave
Vmin = voltage minima of a standing wave
𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿(𝑑𝑑𝑑𝑑) = 20𝑙𝑙𝑙𝑙𝑙𝑙
𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉 + 1
𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉 − 1
𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶(𝑑𝑑𝑑𝑑) = 𝐶𝐶(𝜔𝜔𝑛𝑛 ) = 10𝑙𝑙𝑙𝑙𝑙𝑙
𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶(𝑑𝑑𝑑𝑑) =
∑𝑁𝑁
𝑛𝑛=1 𝐶𝐶(𝜔𝜔𝑛𝑛 )
𝑁𝑁
𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿(𝑑𝑑𝑑𝑑) = 10𝑙𝑙𝑙𝑙𝑙𝑙
10𝑙𝑙𝑙𝑙𝑙𝑙
𝑃𝑃𝑖𝑖𝑖𝑖
𝑃𝑃𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑
10𝑙𝑙𝑙𝑙𝑙𝑙
𝑃𝑃𝑖𝑖𝑖𝑖 (𝜔𝜔𝑛𝑛 )
𝑃𝑃𝑐𝑐𝑐𝑐𝑐𝑐 (𝜔𝜔𝑛𝑛 )
𝑃𝑃𝑖𝑖𝑖𝑖
𝑃𝑃𝑐𝑐𝑐𝑐𝑐𝑐 + 𝑃𝑃𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑
𝑃𝑃𝑐𝑐𝑐𝑐𝑐𝑐
𝑃𝑃𝑖𝑖𝑖𝑖𝑖𝑖
Max Coupling (dB) – Mean Coupling (dB)
and
Min Coupling (dB) – Mean Coupling (dB)
6
X3C26P1-30S
Rev D
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.
Dimensions are in Inches[MM]
Direction of Part
Feed (Unloading)
Contact us:
rf&s_support@ttm.com
7
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