Directional Coupler
50Ω
Maximum Ratings
Operating Temperature
Storage Temperature
Coaxial
ZFDC-20-4
1 to 1000 MHz
-55°C to 100°C
-55°C to 100°C
Features
Coaxial Connections
INPUT
OUTPUT
COUPLED
3
1
2
• wideband, 1 to 1000 MHz
• excellent directivity, 27 dB typ.
• excellent insertion loss, 0.4 dB typ.
• excellent VSWR, 1.1:1 typ.
• rugged shielded case
BNC version shown
CASE STYLE: K18
Connectors Model
BNC
ZFDC-20-4
SMA
ZFDC-20-4-S
N-TYPE
ZFDC-20-4-N
BRACKET (OPTION"B")
Price
$64.95
$69.95
$69.95
$2.50
Qty.
(1-9)
(1-9)
(1-9)
(1+)
Applications
• VHF/UHF
• cellular
• instrumentation
• communication receivers & transmitters
Directional Coupler Electrical Specifications
Outline Drawing
FREQ.
RANGE
(MHz)
f
L
-f
U
1-1000
COUPLING
(dB)
L
Nom.
19.5±0.5
Flatness
±0.5
MAINLINE LOSS
1
DIRECTIVITY
(dB)
U
L
Min.
28
Typ.
27
M
Min.
20
Typ.
23
U
Min.
28
VSWR
(:1)
POWER
INPUT
(W)
L
MU
Max.
2.0
Max.
0.5
M
Typ. Max. Typ. Max. Typ. Max. Typ.
0.4
1.2
0.4
0.8
0.8
1.5
36
Typ.
1.1
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)
1.00
5.00
9.00
96.00
248.00
420.00
520.00
640.00
840.00
1000.00
Mainline Loss
(dB)
In-Out
0.49
0.34
0.33
0.31
0.35
0.41
0.46
0.53
0.68
0.84
Coupling
(dB)
In-Cpl
19.58
19.44
19.42
19.42
19.47
19.55
19.60
19.66
19.77
19.87
Directivity
(dB)
43.20
45.40
46.16
41.47
34.00
30.27
29.14
28.26
28.03
28.35
In
23.54
27.48
28.13
28.71
29.63
31.67
33.53
35.77
35.04
30.50
Return Loss
(dB)
Out
24.84
30.16
31.18
31.90
31.49
30.80
30.43
29.99
29.07
27.81
Cpl
24.95
30.85
31.81
31.89
31.18
29.73
28.67
27.20
24.87
23.33
Outline Dimensions (
inch
)
mm
A
1.25
31.75
B
1.25
31.75
C
.75
19.05
D
.63
16.00
E
.38
9.65
F
1.00
25.40
G
.125
3.18
H
1.000
25.40
J
--
--
K
--
--
L
.125
3.18
M
1.688
42.88
N
2.18
55.37
P
.75
19.05
Q
wt
.07 grams
70.0
1.78
ZFDC-20-4
MAINLINE LOSS
1.0
MAINLINE LOSS (dB)
0.8
0.6
0.4
0.2
0.0
0
200
400
600
FREQUENCY (MHz)
800
1000
at RF level of -10 dBm
ZFDC-20-4
COUPLING & DIRECTIVITY
70
COUPLING & DIRECTIVITY
(dB)
60
50
40
30
20
10
0
0
200
400
600
FREQUENCY (MHz)
800
1000
at RF level of -10 dBm
COUPLING
DIRECTIVITY
ZFDC-20-4
RETURN LOSS
50
RETURN LOSS (dB)
42
34
26
18
10
0
200
400
600
FREQUENCY (MHz)
800
1000
at RF level of -10 dBm
electrical schematic
CPL
IN
OUT
INPUT
OUTPUT
COUPLED
Distribution Centers
NORTH AMERICA 800-654-7949 • 417-335-5935 • Fax 417-335-5945 • EUROPE 44-1252-832600 • Fax 44-1252-837010
Mini-Circuits
®
INTERNET
http://www.minicircuits.com
P.O. Box 350166, Brooklyn, New York 11235-0003 (718) 934-4500 Fax (718) 332-4661
REV. OR
M93827
ZFDC-20-4
WZ/TD/CP
060803
Mini-Circuits
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Certified
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