Coaxial
Directional Coupler
75Ω
Maximum Ratings
Operating Temperature
Storage Temperature
-55°C to 100°C
-55°C to 100°C
Permanent damage may occur if any of these limits are exceeded.
ZFDC-20-3-75+
ZFDC-20-3-75
10 to 250 MHz
Features
• excellent directivity, 35 dB typ.
• excellent mainline loss, 0.3 dB typ.
• rugged shielded case
CASE STYLE: K18
Connectors Model
BNC
ZFDC-20-3-75(+)
BRACKET (OPTION"B")
Price
Qty.
$49.95 ea. (1-9)
$2.50
(1+)
Coaxial Connections
INPUT
OUTPUT
COUPLED
1
2
3
Applications
• catv
• VHF/UHF
• instrumentation
• amateur radio
+ RoHS compliant in accordance
with EU Directive (2002/95/EC)
The +Suffix identifies RoHS Compliance. See our web site
for RoHS Compliance methodologies and qualifications.
Directional Coupler Electrical Specifications
Outline Drawing
FREQ.
RANGE
(MHz)
f
L
-f
U
10-250
COUPLING
(dB)
L
Nom.
19.3±0.5
Flatness
±0.3
MAINLINE LOSS
1
(dB)
M
U
L
DIRECTIVITY
(dB)
M
Min.
25
Typ.
29
Min.
25
Typ.
28
U
Min.
24
VSWR
(:1)
POWER
INPUT
(W)
L
MU
Max.
2.0
Max.
1.0
Typ. Max. Typ. Max. Typ. Max. Typ.
0.25
0.4
0.3
0.5
0.4
0.6
29
Typ.
1.2
L = low range [f
L
to 10 f
L
]
M = mid range [10 f
L
to f
U
/2]
U= upper range [f
U
/2 to f
U
]
1. Mainline loss includes theoretical power loss at coupled port.
Typical Performance Data
Frequency
(MHz)
10.00
20.00
50.00
90.00
100.00
H
1.000
25.40
Mainline Loss
(dB)
In-Out
0.29
0.30
0.34
0.37
0.39
0.39
0.43
0.44
0.47
0.47
Coupling
(dB)
In-Cpl
19.36
19.36
19.41
19.44
19.46
19.49
19.56
19.62
19.73
19.72
Directivity
(dB)
In
54.40
52.31
41.16
41.57
41.41
35.96
34.87
35.28
34.47
32.56
33.81
33.26
29.77
26.71
26.15
24.78
23.12
22.09
20.73
20.58
Return Loss
(dB)
Out
29.81
29.61
27.51
25.32
24.89
23.76
22.40
21.57
20.21
20.04
Cpl
30.17
28.99
23.16
18.69
17.85
16.01
13.64
12.33
10.76
10.55
Outline Dimensions (
inch
)
mm
A
1.25
31.75
J
--
--
B
1.25
31.75
K
--
--
C
.75
19.05
L
.125
3.18
D
.63
16.00
M
1.688
42.88
E
.38
9.65
N
2.18
55.37
F
1.00
25.40
P
.75
19.05
G
.125
3.18
Q
wt
.07 grams
1.78
70.0
125.00
170.00
200.00
244.00
250.00
ZFDC-20-3-75
MAINLINE LOSS
1.0
MAINLINE LOSS (dB)
0.8
0.6
0.4
0.2
0.0
10
58
106
154
FREQUENCY (MHz)
202
250
at RF level of -10 dBm
ZFDC-20-3-75
COUPLING & DIRECTIVITY
70
COUPLING & DIRECTIVITY
(dB)
60
50
40
30
20
10
0
10
58
106
154
FREQUENCY (MHz)
202
250
at RF level of -10 dBm
COUPLING
DIRECTIVITY
ZFDC-20-3-75
RETURN LOSS
50
RETURN LOSS (dB)
40
30
20
10
0
10
58
106
154
FREQUENCY (MHz)
202
250
at RF level of -10 dBm
Electrical Schematic
CPL
IN
OUT
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M119986
ZFDC-20-3-75
WZ/TD/CP/AM
081112
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