Frequency
(MHz)
Mainline Loss
(dB)
In-Out
Coupling
(dB)
In-Cpl
Directivity
(dB)
In
Return Loss
(dB)
Out Cpl
5.00 0.71 11.86 35.40 22.64 33.41 20.06
8.00 0.69 11.83 36.14 23.06 36.92 20.62
10.00 0.68 11.82 36.32 23.20 38.67 20.80
50.00 0.69 11.83 36.87 23.58 54.57 21.25
100.00 0.69 11.85 37.20 23.75 54.41 21.28
200.00 0.71 11.88 36.97 24.03 42.79 21.20
400.00 0.74 11.94 29.96 24.56 33.53 20.33
600.00 0.80 12.02 23.72 24.68 28.55 18.76
800.00 0.89 12.15 19.26 24.44 24.79 16.99
1000.00 1.02 12.37 16.05 23.85 22.08 15.31
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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 (TAMB= 25°C)
Maximum Ratings
Coaxial Connections
Features
• VHF/UHF
• communications receivers & transmitters
• cellular
• instrumentation
INPUT 1
OUTPUT 2
COUPLED 3
• very flat coupling
• very broad, multi-octave
• all welded construction
• protected by U.S Patents 6,140,887 & 6,784,521
& 6,790,049
Applications
Operating Temperature -40°C to 85°C
Storage Temperature -55°C to 100°C
Outline Drawing
Outline Dimensions ( )
inch
mm
ZX30-12-4
MAINLINE LOSS
0.6
0.7
0.8
0.9
1.0
1.1
1.2
0 200 400 600 800 1000
FREQUENCY (MHz)
MAINLINE LOSS (dB)
at RF level of -10 dBm
ZX30-12-4
COUPLING & DIRECTIVITY
0
10
20
30
40
50
0 200 400 600 800 1000
FREQUENCY (MHz)
COUPLING &
DIRECTIVITY (dB)
DIRECTIVITY COUPLING
at RF level of -10 dBm
ZX30-12-4+
ZX30-12-4
ZX30-12-4
RETURN LOSS
10
20
30
40
50
60
0 200 400 600 800 1000
FREQUENCY (MHz)
RETURN LOSS (dB)
IN OUT CPL
at RF level of -10 dBm
50Ω 5 to 1000 MHz
Directional Coupler
REV. G
M98898
ED-10213A/2
ZX30-12-4
WZ/TD/CP/AM
061127
Coaxial
A
B
C
D
E
F
G
.90
.54
.50
.16
.29
18.80 22.86 13.72 12.70 1.02 4.06 7.37
H
J
K
L
M
N
wt
.37
--
.122
.496
.106
.122
grams
9.40 -- 3.10 12.60 2.69 3.10
20.0
CASE STYLE: FL905
Connectors Model Price Qty.
SMA ZX30-12-4-S(+) $29.95 ea. (1-24)
FREQ.
(MHz)
COUPLING
(dB)
MAINLINE LOSS1
(dB)
DIRECTIVITY
(dB)
VSWR
(:1)
POWER
INPUT, W
fL-fUNom.
Typ.
Flatness
L M U L M U
Typ.
L MU
Typ. Max. Typ. Max. Typ. Max. Typ. Min. Typ. Min. Typ. Min. Max. Max.
5-1000 12.0±0.5 ±0.3 0.7 1.0 0.85 1.0 0.9 1.2 35 28 25 20 20 13 1.15 0.5 1.0
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.
+ RoHS compliant in accordance
with EU Directive (2002/95/EC)
The +Suffix identifies RoHS Compliance. See our web site
for RoHS Compliance methodologies and qualifications.
electrical schematic