ORBIT FR Wall Module - AEWM User Manual

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Wall Module - AEWM Series

Wall module

> Applications:

• Reduce moding problems

• Eliminate moding hot spots and resonances

> Key features:

• Excellent low frequency performances

• Portable (with casters)

• Fast and easy assembly

> Shape:

• Pyramidal

> Frequency band:

• From 250 MHz to 1 GHz

> Panel size:

Standard:

• 2’ x 8’ (60.96 cm x 243.84 cm)

• 4’ x 8’ (121.92 cm x 243.84 cm)

> Height:

• Absorber: 12’’ to 36’’ (30.5 cm to 91.4 cm)

> Operating conditions:

• Temperature: 70º F +/- 10º (21º C +/- 3º)

Relative humidity: 55 % RH +/-15 %

•

> Indoor/outdoor:

• Indoor

> Treatment:

• Fire retardant

> Related certifi cations:

• MIL-STD 461/462

• NRL 8093 – 1, 2, 3

> Ordering code:

• AEWM-XX-Y, where XX designates absorber height

in inches and Y designates panel width in feet

Adapted Absorbers

23

1/ Description

The Wall Module is used in test facilities to absorb
interfering signals on a selective basis to help reduce
moding problems. The Wall Module also eliminates
moding hot spots and resonances while providing good
wide angle performance.
Wall Modules are shipped semi-assembled to protect
the absorbers. Simple instructions and easy-to-use
supplied hardware facilitate fast and easy assembly.

Special Wall Modules can be designed using any of the
AEP or AEW products manufactured by AEMI.
A Baffl e Wall reduces the strength (level) of multiple
refl ections and resonant conditions which are typical in
shielded rooms at certain frequencies. Sound Baffl es
are a fundamental tool of mitigation, the practice of
minimizing reverberation. In an anechoic chamber, Baffl es
are applied to walls and ceilings to reduce undesirable
coupling in the measurement zone.

2/ Low frequency performances

The use of EM materials provides good low frequency
performance to accommodate MIL-STD 461/462
applications. The Wall Module is constructed of absorber
materials applied to 24 gauge sheet metal. This permits
increased effi ciency in absorbing characteristics and
allows the user to shield the test environment from
personnel or equipment behind the Wall Modules.

MULTIMODING

Various resonant modes are possible
when radiated measurements are
conducted within a shielded room,
depending on room size, operating
wavelength, and the geometric
relationship of the antennas.
Multimoding can also occur as
a function of the cavity dimensions

3/ Customization

The Wall Modules may also be ordered without the sheet
metal backing for customers who prefer not to have any

and equipment placement when
the test facility room size is greater
than the wavelength of the frequency
of operation.

additional refl ective surfaces inside the enclosure.

4/ Specifi cations

AEWM- AEWM- AEWM- AEWM- AEWM- AEWM- AEWM- AEWM-

12-2 12-4 18-2 18-4 24-2 24-4 36-2 36-4

Height in 12 12 18 18 24 24 36 36

Absorber Panel ft 2 x 8 4 x 8 2 x 8 4 x 8 2 x 8 4 x 8 2 x 8 4 x 8
Description m .61 x 2.4 1.2 x 2.4 .61 x 2.4 1.2 x 2.4 .61 x 2.4 1.2 x 2.4 .61 x 2.4 1.2 x 2.4

@ 250 MHz dB 19 19 21 21 26 26 30 30

@ 500 MHz dB 26 26 29 29 32 32 36 36

@ 1.0 GHz dB 32 32 35 35 38 38 41 41

Incidence

@ Normal

Absorption
Power Watt/in

Watt/m2 775 775 775 775 775 775 775 775

Shipping Weight lbs 128 250 160 310 180 350 270 530
(approx.) kg 58 113.4 72.6 140.6 81.6 158.8 122.5 240.4

2

0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5

24

AEWM 36-4 mechanical drawing

36.0”

48.0”

96.0”

48.0”