TERMINALS (Top View)
Orientation in Tape
The ITF SMD 3dB 90° Coupler is based on thin-film multilayer
technology. The technology provides a miniature part with excellent
high frequency performance and rugged construction for reliable
automatic assembly.
The ITF 3dB 90° Coupler is offered in a variety of frequency bands
compatible with various types of high frequency wireless
systems.
APPLICATIONS
• Balanced Amplifiers and
Signal Distribution in
Mobile Communications
L
A
BW
T
DIMENSIONS:
millimeters (inches) Bottom View
L2.03±0.10
(0.080±0.004)
W1.55±0.10
(0.061±0.004)
T0.98±0.15
(0.037±0.006)
A0.56±0.25
(0.022±0.010)
B0.35±0.15
(0.014±0.006)
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
GENERAL DESCRIPTION
ITF TECHNOLOGY
1.76
(0.069)
2.24 (0.088)
GROUND
0.70
(0.028)
0.64
(0.025)
0.15 (0.006) TYP.
50
OHM
IN
OUT1
OUT2
50
OHM
Code Letter
Marking
IN
OUT1
OUT2
FEATURES
• Miniature 0805 size
• Low I. Loss
• High Isolation
• Power Handling:
10W RF CW
• Surface Mountable
• Supplied on Tape and Reel
• Operating Temperature
-40°C to +85°C
Recommended Pad Layout Dimensions mm (inches)
Part Number** Frequency FOI. Loss @ FOPhase Balance Code Letter
[MHz] [dB] [deg] max. Marking
DB0805A0880AWTR 880±30 0.35 3 Y
DB0805A0915AWTR 915±30 0.35 3 V
DB0805A0967AWTR 967±30 0.35 3 V
DB0805A1350AWTR 1350±50 0.35 3 C
DB0805A1650AWTR 1650±50 0.35 3 F
DB0805A1800AWTR 1800±50 0.30 3 F
DB0805A1850AWTR 1850±50 0.30 3 K
DB0805A1900AWTR 1900±50 0.30 3 K
DB0805A1950AWTR 1950±50 0.25 3 K
DB0805A2140AWTR 2140±50 0.25 3 L
DB0805A2325AWTR 2325±50 0.25 3 T
ELECTRICAL PARAMETERS*
*With Recommended Pad Layout
** LEAD FREE TERMINATION
PART NUMBERS:
DB0805AxxxxASTR
LEAD-FREE COMPATIBLE
COMPONENT
NOTE: Additional Frequencies Available Upon Request
3
87
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-3.8
850 865 880 895 910
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
850 855 880 905 930
Frequency (MHz)
dB
880 ± 30MHz DB0805A0880AWTR
3
88
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-2.8
-3.2
-3.4
-3.6
-3.8
885 900 915 930 945
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
865 890 915 940 965
Frequency (MHz)
dB
915 ± 30MHz DB0805A0915AWTR
3
89
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-2.8
-3.2
-3.4
-3.6
-3.8
937 952 967 982 997
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
917 942 967 992 1017
Frequency (MHz)
dB
967± 30MHz DB0805A0967AWTR
3
90
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-3.8
1300 1350 1400
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
1300 1350 1400
Frequency (MHz)
dB
1350 ± 50MHz DB0805A1350AWTR
3
91
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-2.8
1550 1600 1650 1700 1750
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
1550 1600 1650 1700 1750
Frequency (MHz)
dB
1650 ± 50MHz DB0805A1650AWTR
3
92
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-2.8
1750 1775 1800 1825 1850
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
1750 1775 1800 1825 1850
Frequency (MHz)
dB
1800 ± 50MHz DB0805A1800AWTR
3
93
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-2.8
1800 1825 1850 1875 1900
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
1800 1825 1850 1875 1900
Frequency (MHz)
dB
1850 ± 50MHz DB0805A1850AWTR
3
94
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
1850 1875 1900 1925 1950
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
1850 1875 1900 1925 1950
Frequency (MHz)
dB
1900 ± 50MHz DB0805A1900AWTR
3
95
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-2.8
1900 1925 1950 1975 2000
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
1900 1925 1950 1975 2000
Frequency (MHz)
dB
1950 ± 50MHz DB0805A1950AWTR
3
96
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.4
-3.6
-3.8
-2.6
-2.8
2040 2090 2140 2190 2240
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
2140 2090 2140 2190 2240
Frequency (MHz)
dB
2140 ± 50MHz DB0805A2140AWTR
3
97
Thin-Film Directional Couplers
DB0805 3dB 90° Couplers
I. Loss 1
I. Loss 2
-3.0
-3.2
-3.3
-3.4
-3.5
-3.1
2275 2300 2325 2350 2375
Frequency (MHz)
dB
R. Loss
Isolation
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
2275 2300 2325 2350 2375
Frequency (MHz)
dB
2325 ± 50MHz DB0805A2325AWTR
3
98
Thin-Film Directional Couplers
DB0805 3dB 90° Test Jigs
GENERAL DESCRIPTION
These jigs are designed for testing the DB0805 3dB 90°
Couplers using a Vector Network Analyzer.
They consist of a dielectric substrate, having 50Ω microstrips
as conducting lines and a bottom ground plane located at a
distance of 0.254mm from the microstrips.
The substrate used is Neltec’s NH9338ST0254C1BC.
The connectors are SMA type (female), ‘Johnson Components
Inc.’ Product P/N: 142-0701-841.
Both a measurement jig and a calibration jig are provided.
The calibration jig is designed for a full 2-port calibration, and
consists of an open line, short line and through line. LOAD
calibration can be done by a 50Ω SMA termination.
When measuring a component, it can be either soldered or
pressed using a non-metallic stick until all four ports touch
the appropriate pads. Set the VNA to the relevant frequency
band. Connect the VNA using a 10dB attenuator on the jig
terminal connected to port 2. Follow the VNA’s instruction
manual and use the calibration jig to perform a full 2-port
calibration in the required bandwidths.
Place the coupler on the measurement jig as follows:
Input (Coupler) Connector 1 (Jig) Output 1 (Coupler) Connector 3 (Jig)
50Ω (Coupler) Connector 2 (Jig) Output 2 (Coupler) Connector 4 (Jig)
To measure R. Loss and I. Loss 1 connect:
Connector 1 (Jig) Port 1 (VNA) Connector 3 (Jig) Port 2 (VNA)
Connector 2 (Jig) 50Ω Connector 4 (Jig) 50Ω
To measure R. Loss and I. Loss 2 connect:
Connector 1 (Jig) Port 1 (VNA) Connector 3 (Jig) 50Ω
Connector 2 (Jig) 50Ω Connector 4 (Jig) Port 2 (VNA)
To measure Isolation connect:
Connector 1 (Jig) 50Ω Connector 3 (Jig) Port 1 (VNA)
Connector 2 (Jig) 50Ω Connector 4 (Jig) Port 2 (VNA)
MEASUREMENT PROCEDURE
Measurement Jig
Connector 1
Connector 2
Connector 4
Connector 3
Calibration Jig
Short Line
to GND
Load &
Through
Load &
Through
Connector
Johnson
P/N 142-0701-841
Open
Line
3
99
