Coaxial
Directional Coupler
ZFDC-20-4
50Ω
1 to 1000 MHz
Features
Maximum Ratings
BNC version shown
Operating Temperature
-55°C to 100°C
-55°C to 100°C
• wideband, 1 to 1000 MHz
CASE STYLE: K18
• excellent directivity, 27 dB typ.
• excellent insertion loss, 0.4 dB typ.
• excellent VSWR, 1.1:1 typ.
• rugged shielded case
Storage Temperature
Connectors Model
Price
Qty.
(1-9)
(1-9)
(1-9)
(1+)
BNC
SMA
N-TYPE
ZFDC-20-4
ZFDC-20-4-S
ZFDC-20-4-N
$64.95
$69.95
$69.95
$2.50
Coaxial Connections
INPUT
3
1
2
BRACKET (OPTION"B")
OUTPUT
COUPLED
Applications
• VHF/UHF
• cellular
• instrumentation
• 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 0.4 1.2 0.4 0.8 0.8 1.5 36 28 27 20 23 28
M = mid range [10 fL to fU/2] U= upper range [fU/2 to fU]
Typ.
1.1
Max. Max.
1-1000
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.
Typical Performance Data
Frequency
(MHz)
Mainline Loss
(dB)
Coupling
(dB)
In-Cpl
Directivity
(dB)
Return Loss
(dB)
In-Out
In
Out
Cpl
1.00
5.00
9.00
96.00
248.00
0.49
0.34
0.33
0.31
0.35
19.58
19.44
19.42
19.42
19.47
43.20
45.40
46.16
41.47
34.00
23.54
27.48
28.13
28.71
29.63
24.84
30.16
31.18
31.90
31.49
24.95
30.85
31.81
31.89
31.18
inch
Outline Dimensions (
)
mm
A
B
C
D
E
F
G
H
1.25
1
.25
.
75
.
63
.
38
1
.00
.
125
1
.000
420.00
520.00
640.00
840.00
1000.00
0.41
0.46
0.53
0.68
0.84
19.55
19.60
19.66
19.77
19.87
30.27
29.14
28.26
28.03
28.35
31.67
33.53
35.77
35.04
30.50
30.80
30.43
29.99
29.07
27.81
29.73
28.67
27.20
24.87
23.33
31.75 31.75 19.05 16.00
9.65 25.40
3.18 25.40
J
K
L
M
N
P
75
Q
wt
-
-
-
-
.
125
1
.688
2.18
.
.
07
grams
--
--
3.18 42.88 55.37 19.05
1.78
7
0.0
ZFDC-20-4
MAINLINE LOSS
ZFDC-20-4
COUPLING & DIRECTIVITY
at RF level of -10 dBm
at RF level of -10 dBm
1.0
0.8
0.6
0.4
0.2
0.0
70
60
50
40
30
20
10
0
COUPLING
DIRECTIVITY
0
200
400
600
800
1000
0
200
400
600
800
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
ZFDC-20-4
RETURN LOSS
electrical schematic
at RF level of -10 dBm
50
42
34
26
18
10
IN
OUT
CPL
OUTPUT
INPUT
COUPLED
0
200
400
600
800
1000
FREQUENCY (MHz)
REV. OR
M93827
ZFDC-20-4
WZ/TD/CP
060803
®
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