CHO-CELLâ„¢ Shielded Vent Panels0 pages

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CHO-CELL Shielded Vents
CHO-CELL panels are Chomerics’
very high performance shielded
honeycomb air vents, especially
designed for high frequency environments
and to meet TEMPEST
specifications. They provide greater
than 90 dB attenuation between
200 MHz and 10 GHz. Shielding
is typically 30 dB better than conventional
panels, achieved by unique
design features, which include a
CHO-SEAL mounting gasket.
CHO-CELL vents are free of
polarization effects, provide low air
resistance, and are lightweight. They
Figure 1 Insertion Loss Through Apertures
The above data illustrates insertion loss typically
achieved through open apertures from 24 in. to
2 in. square (per MIL-STD-285).
SPECIFICATIONS
Honeycomb 0.002 in. (0.051 mm) foil, 0.125 in. (3.2 mm) cells, 0.500
in. (12.7 mm) thick aluminum per MIL-C-7438; finish:
electroless nickel per MIL-C-26074C, Class 1, Grade A,
0.0015 in. (0.04 mm) thick
Frame Aluminum per QQ-A-200/8 alloy 6061-T4; finish:
electroless nickel per MIL-C-26074C, Class 1, Grade A,
0.0015 in. (0.04 mm) thick
Mounting Gasket CHO-SEAL 1215 silver-plated-copper filled silicone
Sizes Per customer requirements, up to 24 x 24 in.
(61 x 61 cm) max.
Mounting Holes Thru holes, 0.188 in. (4.8 mm) dia. (for #8 screws)
[2-3 in. (5.1-7.6 cm) spacing recommended]
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CHO-SEAL
Gasket
Conductive Epoxy
Honeycomb
Core
Support Bushing
Frame
0.188 in. (4.8 mm) Dia.
Mounting Hole
Cross Section of CHO-CELL Vent
are offered in custom configurations,
with thru-hole mounting.
Ordering Procedure
CHO-CELL panels are made
to customer size specifications up
to 24 x 24 in. (61 x 61 cm). Part
numbers will be supplied by
Chomerics. Contact our Applications
Engineering Department.
Figure 2 Alternate Extrusions for CHO-CELL Construction, in. (mm). Others available, please inquire.
10
10
100 1000 10000
20
30
40
50
60
70
Frequency (MHz)
Insertion Loss (dB)
2 in. (5.1 cm) Opening
4 in. (10.2 cm) Opening
6 in. (15.2 cm) Opening
12 in. (30.5 cm) Opening
24 in. (61.0 cm) Opening
EMI SHIELDED VENTS
CHO-CELL™ Shielded Vent Panels
Table 1
See page 168 for shielding effectiveness
information.
(mm dimensions in parentheses)
0.062
(1.57)
1.125
(28.58)
0.625
(15.88)
0.062
(1.57)
0.500
(12.70)
1.125
(28.58)
0.625
(15.88)
1.437(36.50)
0.375
(9.52)
0.500
(12.70)
0.875
(22.22)
0.062
(1.57)
0.062
(1.57)
0.375
(9.52)
0.312
(7.92)
0.060
(1.52)
0.080
(2.03)
0.190
(4.83)
1.040
(26.42)
1.125 (28.58)
0.733
(18.62)
1.125 (28.58)
0.312
(7.92)
1.125
(28.58)
0.392
(9.66)
0.540 (13.72)
0.733
(18.62)
0.060
(1.52)
0.190
(4.83)
0.080
(2.03)
0.060 (1.52)
0.190
(4.83) 0.750
(19.05)
0.733
(18.62)
0.380
(9.64)
0.380
(9.64)
1.000 (25.40)
0.400
(10.16)
0.192
(4.88)
0.080
(2.30)
0.380
(9.64)
61-125 61-123
0.062
(1.57)
0.625
(15.88)
0.625
(15.88)
61-195
0.062
(1.57)
0.625
(15.88)
0.375
(9.53)
61-158 61-126
61-311
61-183 61-127 61-198
61-161
0.080
(2.03)
Aluminum Extrusions
61-129
0.062
(1.57)
0.500
(12.70)
0.500
(12.70)
61-265
0.062
(1.57)
0.375
(9.53)
0.500
(12.70)