2743037447 Fair-Rite, 2743037447 Datasheet - Page 184

• Manufacturer Part Number: 2743037447
• Description: CHIP BEAD,Ferrite
• Manufacturer: Fair-Rite

Specifications of 2743037447

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Fair-Rite Products Corp.
Phone: (888) FAIR RITE / [phone]
Technical Information
184
Figure 3
Wide Angle Absorption
One of the most overlooked aspects of using any absorber is the
rolloff of absorption with increasing angle of incidence. Most
published absorber data contains only normal incidence return
loss (dB) which is typically where the maximum absorption is
obtained. Normal incidence is defined as plane wave radation
arriving perpendicular (0°) to the plane of the absorbing surface.
The curves in Figure 4 were generated using equations de-
scribed in IEEE document “Recommended Practice for RF
Absorber Evaluation in the range 30 MHz to 5 GHz”. Since the
reflections occuring in anechoic chambers seldom illuminate
absorber materials at 0°, it is important to consider the reflection
angles generated by each chamber geometry and size for best
results. For most chambers, the range of angles is in the 40-60°
range, however it is usually desirable to operate at < 50°.
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0
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Figure 2
[phone]
Typical Return Loss with Dielectric Spacer
100
Ferrite
Dielectric
5.4mm
6.3mm
Spacer
Frequency (MHz)
6.0mm
5.7mm
Spacer Thickness = 13mm
1000
Metal
Wall
• FAX: (888) FERRITE / [phone] • www.fair-rite.com • E-Mail: [e-mail]
[phone]
10000
Return loss vs angle of incidence for TM polarization is shown
in Figure 4. Return loss curves for TE polarization (not shown)
are similar.
Figure 4
Precision Dimensions
Studies have shown that maximum low-frequency performance
is obtained when tile to tile gaps are minimized.
precisely machines each of the six surfaces to ± 0.13mm (.005”)
to ensure a tight tile to tile fit for easier installation with less cutting
required. Figure 5 illustrates the effect of gaps on tile perfor-
mance when installed with: no gap (0mm), .25mm and 1.0mm.
It is critical to maintain contact between tiles for best results. The
final results of the completed test chamber will also be degraded
by other factors such as lights, gaps around door openings, and
exposed metallic conduit.
Figure 5
P.O. Box J,One Commercial Row, Wallkill, NY 12589-0288
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Note: (914) Area Code has changed to (845).
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Wide-Angle Return Loss – TM Polarization
1
Reflectivity vs. Tile – Tile Gap Size
75˚
60˚
45˚
30˚
0˚
100
1.0mm
.25mm
0mm
Frequency (MHz)
Frequency (MHz)
1000
14th Edition
Fair-Rite
10000
10
2