Coaxial
Directional Coupler
ZFDC-20-3+
50Ω
0.2 to 250 MHz
Features
Maximum Ratings
Operating Temperature
Storage Temperature
BNC version shown
CASE STYLE: K18
Connectors Model
• excellent directivity, 33 dB typ.
-55°C to 100°C
-55°C to 100°C
• excellent mainline loss, 0.25 dB typ.
• rugged shielded case
BNC
ZFDC-20-3+
Permanent damage may occur if any of these limits are exceeded.
SMA
N-TYPE
ZFDC-20-3-S+
ZFDC-20-3-N+
Applications
• VHF
• instrumentation
• amateur radio
Coaxial Connections
BRACKET (OPTION"B")
INPUT
1
2
3
OUTPUT
COUPLED
+RoHS Compliant
The +Suffix identifies RoHS Compliance. See our web site
for RoHS Compliance methodologies and qualifications
Directional Coupler Electrical Specifications
FREQ.
RANGE
(MHz)
COUPLING
(dB)
MAINLINE LOSS1
DIRECTIVITY
(dB)
VSWR
(:1)
POWER
INPUT
(W)
(dB)
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.
±0.25 0.35 0.6 0.25 0.5 0.35 0.6 36 25 33 25 25 20
M = mid range [10 fL to fU/2] U= upper range [fU/2 to fU]
Typ.
1.2
Max. Max.
0.2-250
19.5±0.5
1.5
4.0
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
0.20
0.60
1.00
37.00
81.00
0.22
0.22
0.21
0.17
0.18
19.25
19.26
19.24
19.20
19.19
51.15
49.36
50.27
39.35
33.35
28.24
35.75
38.37
42.77
35.73
27.54
32.69
34.30
38.65
34.10
28.44
32.47
33.77
36.63
33.94
inch
Outline Dimensions (
)
mm
A
1.25
B
1.25
C
.75
D
.63
E
.38
F
1.00
G
H
130.00
155.00
182.00
218.00
250.00
0.21
0.19
0.21
0.23
0.25
19.18
19.13
19.16
19.09
19.11
29.34
28.05
26.89
25.81
25.10
31.27
29.52
27.96
26.19
24.80
30.06
28.45
27.00
25.31
23.98
30.67
29.25
27.95
26.32
25.04
.125 1.000
3.18 25.40
31.75 31.75 19.05 16.00
9.65 25.40
J
--
--
K
--
--
L
M
N
2.18
P
.75
Q
wt
.07 grams
1.78 70.0
.125 1.688
3.18 42.88 55.37 19.05
ZFDC-20-3+
MAINLINE LOSS
ZFDC-20-3+
COUPLING & DIRECTIVITY
at RF level of -10 dBm
at RF level of -10 dBm
0.5
0.4
0.3
0.2
0.1
0.0
70
60
50
40
30
20
10
0
COUPLING
DIRECTIVITY
0
50
100
150
200
250
0
50
100
150
200
250
FREQUENCY (MHz)
FREQUENCY (MHz)
Electrical Schematic
ZFDC-20-3+
RETURN LOSS
at RF level of -10 dBm
60
52
44
36
28
20
IN
OUT
CPL
0
50
100
150
200
250
FREQUENCY (MHz)
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
REV. F
M153690
ZFDC-20-3+
WZ/TD/CP
151123
®
Mini-Circuits
www.minicircuits.com P.O. Box 350166, Brooklyn, NY 11235-0003 (718) 934-4500 sales@minicircuits.com
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