Outline Drawing
INTERNET
http://www.minicircuits.com
P.O. Box 350166, Brooklyn, New York 11235-0003 (718) 934-4500 Fax (718) 332-4661
Distribution Centers NORTH AMERICA 800-654-7949 417-335-5935 Fax 417-335-5945 EUROPE 44-1252-832600 Fax 44-1252-837010
Mini-Circuits
Mini-Circuits ISO 9001 & ISO 14001 Certified
Typical Performance Data
Directional Coupler Electrical Specifications
Maximum Ratings
Coaxial Connections
INPUT
3
OUTPUT
2
COUPLED
1
Operating Temperature
-55C to 100C
Storage Temperature
-55C to 100C
Outline Dimensions ( )
inch
mm
ZMDC-20-3
MAINLINE LOSS
0.1
0.2
0.3
0.4
0.5
0
50
100
150
200
250
FREQUENCY (MHz)
MAINLINE
LOSS
(dB)
at RF level of -10 dBm
ZMDC-20-3
COUPLING & DIRECTIVITY
0
20
40
60
80
100
0
50
100
150
200
250
FREQUENCY (MHz)
C
O
U
P
L
I
N
G
&
D
I
R
E
C
T
I
V
I
T
Y
(
d
B
)
COUPLING
DIRECTIVITY
at RF level of -10 dBm
ZMDC-20-3
ZMDC-20-3
RETURN LOSS
20
26
32
38
44
50
0
50
100
150
200
250
FREQUENCY (MHz)
RETURN
LOSS
(dB)
IN
OUT
CPL
at RF level of -10 dBm
electrical schematic
INPUT
OUTPUT
COUPLED
50 0.2 to 250 MHz
Directional Coupler
REV. OR
M93849
ZMDC-20-3
WZ/TD/CP
060803
Coaxial
A
B
C
D
E
F
G
H
1.50
1.13
1.00
.50
.155 2.345
.138
.987
38.10 28.70 25.40 12.70
3.94 59.56
3.51 25.07
J
K
L
M
N
P
S
wt
2.50
.10
.31
.75
1.19
.66
.150 grams
63.50
2.54
7.87 19.05 30.23 16.76
3.81
40.0
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 (-55C)
Frequency
(MHz)
Mainline Loss
(dB)
In-Out
Coupling
(dB)
In-Cpl
Directivity
(dB)
In
Return Loss
(dB)
Out
Cpl
FREQ.
RANGE
(MHz)
COUPLING
(dB)
MAINLINE LOSS
1
DIRECTIVITY
(dB)
VSWR
(:1)
POWER
INPUT
(W)
L
*
M
U
L
M
U
L
MU
f
L
-f
U
Nom.
Flatness Typ. Max. Typ. Max. Typ. Max. Typ. Min. Typ. Min. Typ. Min.
Typ.
Max.
Max.
0.2-250
19.50.5
0.5
0.35
0.6
0.35
0.5
0.35
0.6
36
30
33
25
25
20
1.2
1.5
4.0
Features
excellent insertion loss, 0.35 dB typ.
excellent directivity, 33 dB typ.
high input power, up to 4W max.
rugged shielded case
Applications
HF/VHF
amateur radio
instrumentation
CASE STYLE: M21
Connectors Model
Price
Qty.
SMA
ZMDC-20-3
$49.95
(1-9)
BRACKET (OPTION"B")
$5.00
(1+)
BRACKET (OPTION "BR")
$2.50
(1+)
0.20
0.27
19.30
50.00
21.66
21.23
20.44
0.30
0.28
19.34
49.89
21.42
21.34
20.83
0.92
0.28
19.36
49.51
28.84
28.04
28.38
49.93
0.24
19.33
51.88
36.50
34.32
37.55
101.43
0.29
19.39
45.73
31.41
30.95
34.11
125.15
0.30
19.40
42.05
29.83
29.57
32.57
162.29
0.30
19.42
38.02
27.88
27.75
30.24
216.29
0.33
19.46
35.65
25.38
25.70
27.77
243.13
0.34
19.49
33.18
24.43
24.88
26.47
250.00
0.35
19.50
33.42
24.21
24.67
26.09
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