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Notes: 1. Performance and quality attributes and conditions not expressly stated in this specification sheet are intended to be excluded and do not form a part of this specification sheet. 2. Electrical specifications
and performance data contained herein are based on Mini-Circuit’s applicable established test performance criteria and measurement instructions. 3. The parts covered by this specification sheet 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
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IF/RF MICROWAVE COMPONENTS
Outline Drawing
Typical Performance Data
Directional Coupler Electrical Specifications
Maximum Ratings
Coaxial Connections
INPUT 3
OUTPUT 1
COUPLED 2
Operating Temperature -55°C to 100°C
Storage Temperature -55°C to 100°C
Outline Dimensions ( )
inch
mm
ZFDC-20-4+
MAINLINE LOSS
0.0
0.2
0.4
0.6
0.8
1.0
0 200 400 600 800 1000
FREQUENCY (MHz)
MAINLINE LOSS (dB)
at RF level of -10 dBm
ZFDC-20-4+
COUPLING & DIRECTIVITY
0
10
20
30
40
50
60
70
0 200 400 600 800 1000
FREQUENCY (MHz)
COUPLING & DIRECTIVITY
(dB)
COUPLING DIRECTIVITY
at RF level of -10 dBm
ZFDC-20-4+
RETURN LOSS
10
18
26
34
42
50
0 200 400 600 800 1000
FREQUENCY (MHz)
RETURN LOSS (dB)
IN OUT CPL
at RF level of -10 dBm
50Ω 1 to 1000 MHz
Directional Coupler
REV. C
M121747
ZFDC-20-4+
WZ/TD/CP/AM
090917
Coaxial
A
B
C
D
E
F
G
H
.25
.25
.
75
.
63
.
38
.00
125
1
.000
31.75 31.75 19.05 16.00 9.65 25.40 3.18 25.40
J
K
L
M
N
P
Q
w
t
-
-
-
-
125
1
.688
.18
.
75
.
07
g
rams
-- -- 3.18 42.88 55.37 19.05 1.78
0.0
CASE STYLE: K18
Connectors Model Price Qty.
BNC ZFDC-20-4(+) $64.95 (1-9)
SMA ZFDC-20-4-S+ $69.95 (1-9)
N-TYPE ZFDC-20-4-N(+) $69.95 (1-9)
BRACKET (OPTION"B") $2.50 (1+)
L = low range [fL to 10 fL] M = mid range [10 fL to fU/2] U= upper range [fU/2 to fU]
1. Mainline loss includes theoretical power loss at coupled port.
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 LOSS1
(dB) DIRECTIVITY
(dB) VSWR
(:1) POWER
INPUT
(W)
L M U L M U L MU
fL-fUNom. Flatness Typ. Max. Typ. Max. Typ. Max. Typ. Min. Typ. Min. Typ. Min. Typ. Max. Max.
1-1000 19.5±0.5 ±0.5 0.4 1.2 0.4 0.8 0.8 1.5 36 28 27 20 23 18 1.1 0.5 2.0
Features
• wideband, 1 to 1000 MHz
• excellent directivity, 27 dB typ.
• excellent mainline loss, 0.4 dB typ.
• excellent VSWR, 1.1:1 typ.
• rugged shielded case
Applications
• VHF/UHF
• cellular
• instrumentation
• communication receivers & transmitters
BNC version shown
1.00 0.49 19.58 43.20 23.54 24.84 24.95
5.00 0.34 19.44 45.40 27.48 30.16 30.85
9.00 0.33 19.42 46.16 28.13 31.18 31.81
96.00 0.31 19.42 41.47 28.71 31.90 31.89
248.00 0.35 19.47 34.00 29.63 31.49 31.18
420.00 0.41 19.55 30.27 31.67 30.80 29.73
520.00 0.46 19.60 29.14 33.53 30.43 28.67
640.00 0.53 19.66 28.26 35.77 29.99 27.20
840.00 0.68 19.77 28.03 35.04 29.07 24.87
1000.00 0.84 19.87 28.35 30.50 27.81 23.33
ZFDC-20-4+
Electrical Schematic
P ermanent damage may occur if an y of these limits are e xceeded.
+ RoHS compliant in accordance
with EU Directive (2002/95/EC)
The +Suffix has been added in order to identify RoHS
Compliance. See our web site for RoHS Compliance
methodologies and qualifications.