Directional Coupler
50Ω
Maximum Ratings
Operating Temperature
Storage Temperature
Coaxial
ZMDC-20-3+
0.2 to 250 MHz
-55°C to 100°C
-55°C to 100°C
Features
Permanent damage may occur if any of these limits are exceeded.
Coaxial Connections
INPUT
OUTPUT
COUPLED
• excellent mainline loss, 0.35 dB typ.
• excellent directivity, 33 dB typ.
• high input power, up to 4W max.
• rugged shielded case
CASE STYLE: M21
Connectors Model
SMA
ZMDC-20-3+
BRACKET (OPTION"B")
BRACKET (OPTION "BR")
Price
$49.95
$5.00
$1.50
Qty.
(1-9)
(1+)
(1+)
3
2
1
Applications
• HF/VHF
• amateur radio
• instrumentation
+RoHS Compliant
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
0.2-250
COUPLING
(dB)
L
*
Nom.
19.5±0.5
Flatness
±0.5
MAINLINE LOSS
1
(dB)
M
U
L
DIRECTIVITY
(dB)
M
Min.
30
Typ.
33
Min.
25
Typ.
25
U
Min.
20
VSWR
(:1)
POWER
INPUT
(W)
L
MU
Max.
4.0
Max.
1.5
Typ. Max. Typ. Max. Typ. Max. Typ.
0.35
0.6
0.35
0.5
0.35
0.6
36
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.
*Insertion loss specification in L range may degrade up to 1 dB at cold temperature (-55°C)
Typical Performance Data
Frequency
(MHz)
0.20
0.30
0.92
49.93
101.43
125.15
162.29
216.29
243.13
250.00
Mainline Loss
(dB)
In-Out
0.27
0.28
0.28
0.24
0.29
0.30
0.30
0.33
0.34
0.35
ZMDC-20-3+
MAINLINE LOSS
0.5
MAINLINE LOSS (dB)
0.4
0.3
0.2
0.1
0
50
100
150
FREQUENCY (MHz)
200
250
at RF level of -10 dBm
Coupling
(dB)
In-Cpl
19.30
19.34
19.36
19.33
19.39
19.40
19.42
19.46
19.49
19.50
Directivity
(dB)
50.00
49.89
49.51
51.88
45.73
42.05
38.02
35.65
33.18
33.42
In
21.66
21.42
28.84
36.50
31.41
29.83
27.88
25.38
24.43
24.21
Return Loss
(dB)
Out
21.23
21.34
28.04
34.32
30.95
29.57
27.75
25.70
24.88
24.67
Cpl
20.44
20.83
28.38
37.55
34.11
32.57
30.24
27.77
26.47
26.09
Outline Dimensions (
inch
)
mm
A
1.50
38.10
J
2.50
63.50
B
1.13
28.70
K
.10
2.54
C
1.00
25.40
L
.31
7.87
D
.50
12.70
M
.75
19.05
E
.155
3.94
N
1.19
30.23
F
2.345
59.56
P
.66
16.76
G
.138
3.51
H
.987
25.07
S
wt
.150 grams
3.81
40.0
ZMDC-20-3+
COUPLING & DIRECTIVITY
100
COUPLING & DIRECTIVITY
(dB)
80
60
40
20
0
0
50
100
150
FREQUENCY (MHz)
200
250
at RF level of -10 dBm
COUPLING
DIRECTIVITY
ZMDC-20-3+
RETURN LOSS
50
RETURN LOSS (dB)
44
38
32
26
20
0
50
100
150
FREQUENCY (MHz)
200
250
at RF level of -10 dBm
Electrical Schematic
CPL
IN
OUT
Notes
A.
Performance and quality attributes and conditions not expressly stated in this specification document are intended to be excluded and do not form a part of this specification document.
B.
Electrical specifications and performance data contained in this specification document are based on Mini-Circuit’s applicable established test performance criteria and measurement instructions.
C.
The parts covered by this specification document are subject to Mini-Circuits standard limited warranty and terms and conditions (collectively, “Standard Terms”); Purchasers of this part are entitled
to the rights and benefits contained therein. For a full statement of the Standard Terms and the exclusive rights and remedies thereunder, please visit Mini-Circuits’ website at www.minicircuits.com/MCLStore/terms.jsp
www.minicircuits.com
P.O. Box 35166, Brooklyn, NY 11235-0003 (718) 934-4500 sales@minicircuits.com
Mini-Circuits
®
REV. C
M119986
ZMDC-20-3
WZ/TD/CP/AM
131015
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