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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 Drawing
Outline Dimensions ( )
inch
mm
ZDC-20-3-75-1
MAINLINE LOSS
0.0
0.2
0.4
0.6
0.8
1.0
55
62
69
76
83
90
FREQUENCY (MHz)
MAINLINE
LOSS
(dB)
at RF level of -10 dBm
ZDC-20-3-75-1
COUPLING & DIRECTIVITY
0
10
20
30
40
50
55
62
69
76
83
90
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
ZDC-20-3-75-1
ZDC-20-3-75-1
RETURN LOSS
10
16
22
28
34
40
55
62
69
76
83
90
FREQUENCY (MHz)
RETURN
LOSS
(dB)
IN
OUT
CPL
at RF level of -10 dBm
electrical schematic
INPUT
OUTPUT
COUPLED
75 55 to 90 MHz
Directional Coupler
REV. OR
M93849
ZDC-20-3-75-1
WZ/TD/CP
060801
Coaxial
A
B
C
D
E
F
G
H
2.25
1.38
1.24
.50
.150 3.100
.138 1.238
57.15 35.05 31.50 12.70
3.81 78.74
3.51 31.45
J
K
L
M
N
P
S
wt
3.25
.10
.40
1.15
1.86
.64
.150 grams
82.55
2.54 10.16 29.21 47.24 16.26
3.81
74.0
CASE STYLE: M22
Connectors Model
Price
Qty.
BNC
ZDC-20-3-75-1
$52.95 ea. (1-9)
BRACKET (OPTION"B")
$5.00
(1+)
BRACKET (OPTION"BR")
$1.50
(1+)
Frequency
(MHz)
Mainline Loss
(dB)
In-Out
Coupling
(dB)
In-Cpl
Directivity
(dB)
In
Return Loss
(dB)
Out
Cpl
Features
excellent directivity, 35 dB typ.
excellent insertion loss, 0.4 dB typ.
rugged shielded case
Applications
VHF
instrumentation
amateur radio
55.00
0.46
18.61
34.58
25.04
26.15
19.84
59.00
0.47
18.63
33.86
24.76
25.84
19.26
63.00
0.47
18.63
33.36
24.50
25.57
18.71
67.00
0.48
18.65
32.92
24.23
25.28
18.17
71.00
0.48
18.65
32.39
23.98
25.01
17.67
76.00
0.48
18.67
31.99
23.67
24.68
17.08
81.00
0.48
18.67
31.23
23.37
24.39
16.56
85.50
0.49
18.69
30.52
23.10
24.10
16.12
88.00
0.48
18.70
30.40
22.96
23.96
15.88
90.00
0.49
18.70
30.28
22.85
23.82
15.70
1. Mainline loss includes theoretical power loss at coupled port.
FREQ.
RANGE
(MHz)
COUPLING
(dB)
MAINLINE LOSS
1
DIRECTIVITY
(dB)
VSWR
(:1)
POWER
INPUT
(W)
f
L
-f
U
Nom.
Flatness
Typ. Max.
Typ. Min.
Typ.
Max.
55-90
18.60.5
0.3
0.4
0.6
35
30
1.2
4.0
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