Broadband Antenna ALX-4000 / ALX-4000E

Broadband Antenna ALX-4000 / ALX-4000E / ALX-8000E
for emission measurements and immunity tests
Description
The ALX-4000 is an ultra-broadband antenna for emission measurements and immunity tests according to nearly all relevant international standards in the frequency
range from 25 MHz up to 4 GHz. With regard to its mechanical structure it is a linear
polarized logarithmic periodic broadband antenna for the higher frequency range,
combined with a 4:1 broadband dipole (aluminum) for the low frequency range. This
kind of ultra-broadband antenna allows performance of EMC test in one run, without
time consuming antenna changes.
The ALX-4000E is an especially optimized version for emission measurements. It offers lower antenna factors and improved VSWR.
Additionally it can be used for immunity tests which require an input power of less than 100 W cw (200 W intermitt.).
The ALX-8000E has an extended frequency range up to 8 GHz.
All antennas are supplied with antenna factors for 3.0 m and 10.0 m measuring distance (1.0 m on request).
Technical specifications
ALX-4000
Frequency range
Max. input power
ALX-4000E
ALX-8000E
25 MHz to 4 GHz
25 MHz to 8 GHz
100 MHz - 900 W
500 MHz - 300 W
200 W (intermitt.)
1000 MHz - 210 W
100 W (cont.)
2000 MHz - 140 W
3000 MHz - 100 W
50 Ω
Nominal impedance
Connector
type N female
Isotropic gain (LP-Section)
Antenna factor
6.4 ± 1.2 dBi
4 … 37 dB/m
Standing wave ratio SWR typ.
7 ... 34 dB/m
7 ... 43 dB/m
< 1.5
Front to back ratio
20 dB (f > 150 MHz)
Cross polarization
>20 dB (30 MHz...1 GHz)
3 dB beamwidth typ. (E-Plane)
45°-65° (f > 150 MHz)
≈ 78° (f < 150 MHz)
3 dB beamwidth typ. (H-Plane)
Dimensions (W x L x D)
Weight
Fixation (indexing ring)
Use
90°-120° (f > 150 MHz)
1500 x 930 (1218) x 620 mm
1500 x 910 (1218) x 620 mm
1500 x 920 (1253) x 620 mm
3.1 kg
22 mm tube
Emission measurements
Radiated immunity tests
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Broadband Antenna ALX-4000 / ALX-4000E / ALX-8000E
for emission measurements and immunity tests
Measurements of ALX-4000
Measurements of ALX-4000E
Measurements of ALX-8000E
Isotopic gain [dBi]
Isotopic gain [dBi]
Isotopic gain [dBi]
8
Frequency [MHz]
Frequency [MHz]
VSWR
VSWR
VSWR
Frequency [MHz]
Frequency [MHz]
Frequency [MHz]
Antenna Factor [dB/m]
Antenna Factor [dB/m]
Antenna Factor [dB/m]
Frequency [MHz]
Frequency [MHz]
Frequency [MHz]
PAGE // 4
Generated Field Strength [V/m] @ 3 m
100
Generated Field Strength [V/m] @ 3 m
Generated Field Strength [V/m] @ 3 m
Frequency [MHz]
Frequency [MHz]
Frequency [MHz]
Frequency [MHz]