Coaxial
Directional Coupler
ZFDC-10-21-75
75Ω
10 to 750 MHz
Features
Maximum Ratings
Operating Temperature
-55°C to 100°C
-55°C to 100°C
• wideband, 10 to 750 MHz
• excellent directivity, 30 dB typ.
• rugged shielded case
CASE STYLE: K18
Storage Temperature
Connectors Model
Price
$54.95
$2.50
Qty.
(1-9)
(1+)
BNC
ZFDC-10-21-75
BRACKET (OPTION"B")
Coaxial Connections
Applications
INPUT
1
2
3
• catv
OUTPUT
COUPLED
• VHF/UHF
• instrumentation
• communications 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.
±0.75 1.5 1.8 1.5 1.9 1.7 2.1 36 30 30 20 26 20
M = mid range [10 fL to fU/2] U= upper range [fU/2 to fU]
Typ.
1.4
Max. Max.
10-750
11±0.5
1.0
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
10.00
46.00
82.00
140.00
220.00
1.39
1.48
1.57
1.63
1.66
10.96
11.02
11.10
11.17
11.23
60.33
58.37
58.27
54.38
48.45
24.87
23.71
22.47
21.77
21.57
16.51
16.08
15.67
15.51
15.68
16.50
16.15
15.63
15.24
14.99
inch
Outline Dimensions (
)
mm
A
B
C
D
E
F
G
H
1.25
1
.25
.
75
.
63
.
38
1
.00
.
125
1
.000
315.00
390.00
480.00
630.00
750.00
1.67
1.67
1.67
1.69
1.71
11.30
11.36
11.43
11.59
11.72
43.20
39.99
37.62
35.29
33.16
21.19
20.82
20.32
19.10
18.39
15.98
16.33
16.73
16.94
16.89
14.64
14.25
13.67
12.33
11.26
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-10-21-75
MAINLINE LOSS
ZFDC-10-21-75
COUPLING & DIRECTIVITY
at RF level of -10 dBm
at RF level of -10 dBm
2.0
1.8
1.6
1.4
1.2
1.0
100
80
60
40
20
0
COUPLING
DIRECTIVITY
0
150
300
450
600
750
0
150
300
450
600
750
FREQUENCY (MHz)
FREQUENCY (MHz)
ZFDC-10-21-75
RETURN LOSS
electrical schematic
at RF level of -10 dBm
50
40
30
20
10
0
IN
OUT
CPL
OUTPUT
INPUT
COUPLED
0
150
300
450
600
750
FREQUENCY (MHz)
REV. OR
M93827
ZFDC-10-21-75
WZ/TD/CP
060803
®
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