In late May 2018, the reverberation chamber
of the School of Mechanical Engineering of Southeast University, which was
built by RuiFeng RF Technology (Shanghai) Co., Ltd. (RFT), was successfully
delivered. This is oscillating wall stirrer reverberation chamber in
China.
Oscillating system is the more widely used in reverberation chambers. Of course, there
are many other types of oscillating excitation methods, such as frequency,
source and oscillation. The purpose of the oscillating is to change the
characteristic conditions of the volume to achieve different modes of the volume
under different excitation conditions. At the same time, by changing the
geometry of the volume by rotating and oscillating the stirrer system,
different modes can be successfully excited.
Highlights of the project:
The external
of the reverberation chamber is welded by galvanized steel panels according to
customer requirements, and the interior of the reverberation chamber is flat
galvanized steel sheet. All the steel panels are standard sizes of modules, and
through special methods to overcome the deformation caused by welding. These module
templates are available to provide various possible sizes of shielding, and the
shield accessories, such as the cut-off waveguides and access panels, can be constructed
flexible and tailored to each customer’s specific requirement.
The Netherlands
COMTEST oscillating wall stirrer system is used to make the test volume of the
reverberation chamber continuously changing by changing the volume resonance
condition to achieve the purpose of reverberation. One of the main features of
this technology compared to conventional
stirrer system is that it can achieve a larger effective test volume within the
same chamber interior dimension. And the oscillating wall is designed for a
standard rectangular shielded room, so it can be widely used in EMC testing
while ensuring a high shielding effectiveness environment. The movement of the oscillating
wall is repeatable, thus allowing repeatability of the oscillating cycle and
having the same function as the conventional reverberation chamber in the
immunity test. It can fulfil the requirements of IEC61000-4-21, MIL-STD-461 and
DO-160G.
Main indicators of reverberation chamber:
External
shielding dimension: 6.4m*4.05m*3.15m (LxWxH).
The test
volume is not less than: 3.5m*3.0m*2.0m (LxWxH).
Movement
of oscillating wall stirrer system
Frequency
Shielding Effectiveness
Field
10 kHz
≥70dB
Magnetic
100kHz
≥90 dB
Magnetic
1MHz
≥100 dB
Magnetic
10kHz
≥100 dB
Electric
100kHz
≥110 dB
Electric
1MHz
≥110 dB
Electric
100MHz
≥100 dB
Electric
100MHz
≥100 dB
Plane wave
1GHz
≥100 dB
Microwave
10GHz
≥100 dB
Microwave
18GHz
≥100 dB
Microwave
Field
uniformity (FU): according to the latest IEC6100-4-21, in the frequency range
of 180MHz~18GHz. When the frequency is higher than 400MHz, the standard
deviation of the field is less than 3dB; when the frequency is between 180MHz
and 400MHz, the standard deviation decreases linearly from 4dB to 3dB.
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