Coaxial
Directional Coupler
ZFDC-20-5
50Ω
0.1 to 2000 MHz
Features
Maximum Ratings
BNC version shown
Operating Temperature
-55°C to 100°C
-55°C to 100°C
• very wideband, 0.1 to 2000 MHz
CASE STYLE: K18
• excellent directivity, 27 dB typ.
• excellent insertion loss, 0.7 dB typ.
• rugged shielded case
Storage Temperature
Connectors Model
Price
Qty.
(1-9)
(1-9)
(1-9)
(1+)
BNC
SMA
N-TYPE
ZFDC-20-5
ZFDC-20-5-S
ZFDC-20-5-N
$84.95
$89.95
$89.95
$2.50
Coaxial Connections
INPUT
3
1
2
Applications
• cellular
• instrumentation
BRACKET (OPTION"B")
OUTPUT
COUPLED
• communication receivers & transmitters
Directional Coupler Electrical Specifications
FREQ.
RANGE
(MHz)
COUPLING
(dB)
MAINLINE LOSS1
DIRECTIVITY
(dB)
VSWR
(:1)
POWER
INPUT
(W)
Outline Drawing
L
M
U
L
M
U
L
MU
fL-fU
Nom.
Flatness Typ. Max. Typ. Max. Typ. Max. Typ. Min. Typ. Min. Typ. Min.
0.5 0.3 1.0 0.7 1.4 1.5 2.3 30 20 27 20 22 10
M = mid range [10 fL to fU/2] U= upper range [fU/2 to fU]
Typ.
1.2
Max. Max.
0.1-2000 19.5 0.5
0.5
2.0
L = low range [fL to 10 fL]
1. Mainline loss includes theoretical power loss at coupled port.
Above 1000 MHz, coupling flatness ±1 dB.
Typical Performance Data
Frequency
(MHz)
Mainline Loss
(dB)
Coupling
(dB)
In-Cpl
Directivity
(dB)
Return Loss
(dB)
In-Out
In
Out
Cpl
0.10
0.50
0.90
188.00
544.00
0.71
0.49
0.44
0.36
0.69
19.79
19.57
19.52
19.46
19.85
25.09
33.79
34.79
32.56
30.03
11.79
21.84
23.69
26.83
22.02
11.84
22.89
25.23
27.83
22.00
12.78
21.74
23.40
26.54
23.17
inch
Outline Dimensions (
)
mm
A
B
C
D
E
F
G
H
1.25
1.25
.75
.63
.38
1.00
.125 1.000
3.18 25.40
920.00
1020.00
1136.00
1310.00
2000.00
1.07
1.17
1.28
1.41
1.91
20.18
20.18
20.13
19.96
19.34
28.13
28.46
29.48
34.06
18.40
19.60
19.23
18.96
18.82
18.91
20.58
20.30
20.07
19.75
17.73
18.75
17.73
16.64
15.02
10.05
31.75 31.75 19.05 16.00
9.65 25.40
J
--
--
K
--
--
L
M
N
2.18
P
.75
Q
wt
.07 grams
1.78 70.0
.125 1.688
3.18 42.88 55.37 19.05
ZFDC-20-5
MAINLINE LOSS
ZFDC-20-5
COUPLING & DIRECTIVITY
at RF level of -10 dBm
at RF level of -10 dBm
2.0
1.6
1.2
0.8
0.4
0.0
60
50
40
30
20
10
0
COUPLING
DIRECTIVITY
0
400
800
1200
1600
2000
0
400
800
1200
1600
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
ZFDC-20-5
RETURN LOSS
electrical schematic
at RF level of -10 dBm
40
32
24
16
8
IN
OUT
CPL
0
0
400
800
1200
1600
2000
FREQUENCY (MHz)
REV. OR
M93827
ZFDC-20-5
WZ/TD/CP
061206
®
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